summaryrefslogtreecommitdiff
path: root/docs-xml/Samba3-ByExample/SBE-SecureOfficeServer.xml
blob: 2e60b4a91c64554d5c75aa2f0a4bf8ba95b5dd0c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE chapter PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
<chapter id="secure">
  <title>Secure Office Networking</title>

	<para>
	Congratulations, your Samba networking skills are developing nicely. You started out
	with three simple networks in <link linkend="simple"/>, and then in <link linkend="small"/>
	you designed and built a network that provides a high degree of flexibility, integrity,
	and dependability. It was enough for the basic needs each was designed to fulfill. In
	this chapter you address a more complex set of needs. The solution you explore 
	introduces you to basic features that are specific to Samba-3.
	</para>

	<para>
	You should note that a working and secure solution could be implemented using Samba-2.2.x. 
	In the exercises presented here, you are gradually using more Samba-3-specific features,
	so caution is advised for anyone who tries to use Samba-2.2.x with the guidance here given. 
	To avoid confusion, this book is all about Samba-3. Let's get the exercises in this 
	chapter underway.
	</para>

<sect1>
	<title>Introduction</title>

	<para>
	You have made Mr. Meany a very happy man. Recently he paid you a fat bonus for work 
	well done. It is one year since the last network upgrade. You have been quite busy. 
	Two months ago Mr. Meany gave approval to hire Christine Roberson, who has taken over 
	general network management. Soon she will provide primary user support. You have
	demonstrated that you can delegate responsibility and can plan and execute according
	to that plan. Above all, you have shown Mr. Meany that you are a responsible person.
	Today is a big day. Mr. Meany called you to his office at 9 a.m. for news you never 
	expected: You are going to take charge of business operations. Mr. Meany 
	is retiring and has entrusted the business to your capable hands. 
	</para>

	<para>
	Mr. Meany may be retiring from this company, but not from work. He is taking the
	opportunity to develop Abmas Accounting into a larger and more substantial company.
	He says that it took him many years to learn that there is no future in just running
	a business. He now realizes there is great personal satisfaction in the creation of
	career opportunities for people in the local community. He wants to do more for others,
	as he is doing for you. Today he spent a lot of time talking about his grand plan
	for growth, which you will deal with in the chapters ahead.
	</para>

	<para>
	Over the past year, the growth projections were exceeded. The network has grown to
	meet the needs of 130 users. Along with growth, the demand for improved services
	and better functionality has also developed. You are about to make an interim
	improvement and then hand over all Help desk and network maintenance to Christine.
	Christine has professional certifications in Microsoft Windows as well as in Linux;
	she is a hard worker and quite likable. Christine does not want to manage the department
	(although she manages well). She gains job satisfaction when left to sort things out.
	Occasionally she wants to work with you on a challenging problem. When you told her
	about your move, she almost resigned, although she was reassured that a new manager would
	be hired to run Information Technology, and she would be responsible only for operations.
	</para>

	<sect2>
		<title>Assignment Tasks</title>

		<para>
		You promised the staff Internet services including Web browsing, electronic mail, virus
		protection, and a company Web site.  Christine is eager to help turn the vision into 
		reality. Let's see how close you can get to the promises made.
		</para>

		<para>
		The network you are about to deliver will service 130 users today. Within a year,
		Abmas will aquire another company. Mr. Meany claims that within 2 years there will be
		well over 500 users on the network. You have bought into the big picture, so prepare 
		for growth.  You have purchased a new server and will implement a new network infrastructure. 
		</para>

		<para>
		You have decided to not recycle old network components. The only items that will be
		carried forward are notebook computers. You offered staff new notebooks, but not 
		one person wanted the disruption for what was perceived as a marginal update. 
		You decided to give everyone, even the notebook user, a new desktop computer.
		</para>

		<para>
		You procured a DSL Internet connection that provides 1.5 Mb/sec (bidirectional)
		and a 10 Mb/sec ethernet port. You registered the domain
		<constant>abmas.us</constant>, and the Internet Service Provider (ISP) is supplying
		secondary DNS. Information furnished by your ISP is shown in <link linkend="chap4netid"/>.
		</para>

		<para>
		It is of paramount priority that under no circumstances will Samba offer
		service access from an Internet connection. You are paying an ISP to
		give, as part of its value-added services, full firewall protection for your
		connection to the outside world. The only services allowed in from
		the Internet side are the following destination ports: <constant>http/https (ports 
		80 and 443), email (port 25), DNS (port 53)</constant>. All Internet traffic
		will be allowed out after network address translation (NAT). No internal IP addresses
		are permitted through the NAT filter because complete privacy of internal network
		operations must be assured.
		</para>

		<table id="chap4netid">
			<title>Abmas.US ISP Information</title>
			<tgroup cols="2">
				<colspec align="left"/>
				<colspec align="center"/>
				<thead>
					<row>
						<entry>Parameter</entry>
						<entry>Value</entry>
					</row>
				</thead>
				<tbody>
					<row>
						<entry>Server IP Address</entry>
						<entry>123.45.67.66</entry>
					</row>
					<row>
						<entry>DSL Device IP Address</entry>
						<entry>123.45.67.65</entry>
					</row>
					<row>
						<entry>Network Address</entry>
						<entry>123.45.67.64/30</entry>
					</row>
					<row>
						<entry>Gateway Address</entry>
						<entry>123.45.54.65</entry>
					</row>
					<row>
						<entry>Primary DNS Server</entry>
						<entry>123.45.54.65</entry>
					</row>
					<row>
						<entry>Secondary DNS Server</entry>
						<entry>123.45.54.32</entry>
					</row>
					<row>
						<entry>Forwarding DNS Server</entry>
						<entry>123.45.12.23</entry>
					</row>
				</tbody>
			</tgroup>
		</table>

		<figure id="ch04net">
			<title>Abmas Network Topology &smbmdash; 130 Users</title>
			<imagefile scale="65">chap4-net</imagefile>
		</figure>

		<para>
		Christine recommended that desktop systems should be installed from a single cloned
		master system that has a minimum of locally installed software and loads all software
		off a central application server. The benefit of having the central application server
		is that it allows single-point maintenance of all business applications, a more
		efficient way to manage software.  She further recommended installation of antivirus 
		software on workstations as well as on the Samba server. Christine knows the dangers
		of potential virus infection and insists on a comprehensive approach to detective
		as well as corrective action to protect network operations.
		</para>

		<para>
		A significant concern is the problem of managing company growth. Recently, a number 
		of users had to share a PC while waiting for new machines to arrive. This presented 
		some problems with desktop computers and software installation into the new users' 
		desktop profiles.
		</para>
		
	</sect2>
</sect1>

<sect1>
	<title>Dissection and Discussion</title>

	<para>
	Many of the conclusions you draw here are obvious. Some requirements are not very clear
	or may simply be your means of drawing the most out of Samba-3. Much can be done more simply
	than you will demonstrate here, but keep in mind that the network must scale to at least 500
	users. This means that some functionality will be overdesigned for the current 130-user
	environment.
	</para>

	<sect2>
		<title>Technical Issues</title>

		<para>
		In this exercise we use a 24-bit subnet mask for the two local networks. This,
		of course, limits our network to a maximum of 253 usable IP addresses. The network
		address range chosen is one assigned by RFC1918 for private networks.
		When the number of users on the network begins to approach the limit of usable
		addresses, it is a good idea to switch to a network address specified in RFC1918
		in the 172.16.0.0/16 range. This is done in subsequent chapters.
		</para>

		<para>
		<indexterm><primary>tdbsam</primary></indexterm>
		<indexterm><primary>smbpasswd</primary></indexterm>
		The high growth rates projected are a good reason to use the <constant>tdbsam</constant>
		passdb backend. The use of <constant>smbpasswd</constant> for the backend may result in
		performance problems. The <constant>tdbsam</constant> passdb backend offers features that
		are not available with the older, flat ASCII-based <constant>smbpasswd</constant> database.
		</para>

		<para>
		<indexterm><primary>risk</primary></indexterm>
		The proposed network design uses a single server to act as an Internet services host for
		electronic mail, Web serving, remote administrative access via SSH, 
		Samba-based file and print services. This design is often chosen by sites that feel 	
		they cannot afford or justify the cost or overhead of having separate servers. It must 
		be realized that if security of this type of server should ever be violated (compromised), 
		the whole network and all data is at risk. Many sites continue to choose this type 
		of solution; therefore, this chapter provides detailed coverage of key implementation 
		aspects.
		</para>

		<para>
		Samba will be configured to specifically not operate on the Ethernet interface that is
		directly connected to the Internet.
		</para>

		<para>
		<indexterm><primary>iptables</primary></indexterm>
		<indexterm><primary>NAT</primary></indexterm>
		<indexterm><primary>Network Address Translation</primary><see>NAT</see></indexterm>
		<indexterm><primary>firewall</primary></indexterm>
		You know that your ISP is providing full firewall services, but you cannot rely on that.
		Always assume that human error will occur, so be prepared by using Linux firewall facilities
		based on <command>iptables</command> to effect NAT. Block all
		incoming traffic except to permitted well-known ports. You must also allow incoming packets
		to establish outgoing connections. You will permit all internal outgoing requests.
		</para>

		<para>
		The configuration of Web serving, Web proxy services, electronic mail, and the details of
		generic antivirus handling are beyond the scope of this book and therefore are not
		covered except insofar as this affects Samba-3.
		</para>

		<para>
		<indexterm><primary>login</primary></indexterm>
		Notebook computers are configured to use a network login when in the office and a
		local account to log in while away from the office. Users store all work done in
		transit (away from the office) by using a local share for work files. Standard procedures
		dictate that on completion of the work that necessitates mobile file access, all
		work files are moved back to secure storage on the office server. Staff is instructed
		to not carry on any company notebook computer any files that are not absolutely required.
		This is a preventative measure to protect client information as well as private business
		records.
		</para>

		<para>
		<indexterm><primary>application server</primary></indexterm>
		All applications are served from the central server from a share called <constant>apps</constant>.
		Microsoft Office XP Professional and OpenOffice 1.1.0 will be installed using a network 
		(or administrative) installation. Accounting and financial management software can also
		be run only from the central application server. Notebook users are provided with
		locally installed applications on a need-to-have basis only.
		</para>

		<para>
		<indexterm><primary>roaming profiles</primary></indexterm>
		The introduction of roaming profiles support means that users can move between
		desktop computer systems without constraint while retaining full access to their data.
		The desktop travels with them as they move.
		</para>

		<para>
		<indexterm><primary>DNS</primary></indexterm>
		The DNS server implementation must now address both internal and external
		needs. You forward DNS lookups to your ISP-provided server as well as the 
		<constant>abmas.us</constant> external secondary DNS server.
		</para>

		<para>
		<indexterm><primary>dynamic DNS</primary></indexterm>
		<indexterm><primary>DDNS</primary><see>dynamic DNS</see></indexterm>
		<indexterm><primary>DHCP server</primary></indexterm>
		Compared with the DHCP server configuration in <link linkend="small"/>, <link linkend="dhcp01"/>, the 
		configuration used in this example has to deal with the presence of an Internet connection.
		The scope set for it ensures that no DHCP services will be offered on the external
		connection. All printers are configured as DHCP clients so that the DHCP server assigns
		the printer a fixed IP address by way of the Ethernet interface (MAC) address. One additional
		feature of this DHCP server configuration file is the inclusion of parameters to allow dynamic
		DNS (DDNS) operation.
		</para>

		<para>
		This is the first implementation that depends on a correctly functioning DNS server.
		Comprehensive steps are included to provide for a fully functioning DNS server that also
		is enabled for DDNS operation. This means that DHCP clients can be autoregistered
		with the DNS server.
		</para>

		<para>
		You are taking the opportunity to manually set the netbios name of the Samba server to
		a name other than what will be automatically resolved. You are doing this to ensure that
		the machine has the same NetBIOS name on both network segments.
		</para>

		<para>
		As in the previous network configuration, printing in this network configuration uses
		direct raw printing (i.e., no smart printing and no print driver autodownload to Windows
		clients). Printer drivers are installed on the Windows client manually. This is not
		a problem because Christine is to install and configure one single workstation and
		then clone that configuration, using Norton Ghost, to all workstations. Each machine is
		identical, so this should pose no problem.
		</para>

		<sect3>
		<title>Hardware Requirements</title>

		<para>
		<indexterm><primary>memory requirements</primary></indexterm>
		This server runs a considerable number of services. From similarly configured Linux
		installations, the approximate calculated memory requirements are as shown in
		<link linkend="ch4memoryest"/>.

<example id="ch4memoryest">
<title>Estimation of Memory Requirements</title>
<screen>
Application  Memory per User    130 Users      500 Users
   Name        (MBytes)       Total MBytes   Total MBytes
-----------  ---------------  ------------   ------------
DHCP              2.5               3              3
DNS              16.0              16             16
Samba (nmbd)     16.0              16             16
Samba (winbind)  16.0              16             16
Samba (smbd)      4.0             520           2000
Apache           10.0 (20 User)   200            200
CUPS              3.5              16             32
Basic OS        256.0             256            256
                              -------------- --------------
    Total:                       1043 MBytes    2539 MBytes
                              -------------- --------------
</screen>
</example>
		You should add a safety margin of at least 50% to these estimates. The minimum 
		system memory recommended for initial startup 1 GB, but to permit the system
		to scale to 500 users, it makes sense to provision the machine with 4 GB memory.
		An initial configuration with only 1 GB memory would lead to early performance complaints
		as the system load builds up. Given the low cost of memory, it does not make sense to
		compromise in this area.
		</para>

		<para>
		<indexterm><primary>bandwidth calculations</primary></indexterm>
		Aggregate input/output loads should be considered for sizing network configuration as 
		well as disk subsystems. For network bandwidth calculations, one would typically use an
		estimate of 0.1 MB/sec per user. This suggests that 100-Base-T (approx. 10 MB/sec)
		would deliver below acceptable capacity for the initial user load. It is therefore a good
		idea to begin with 1 Gb Ethernet cards for the two internal networks, each attached
		to a 1 Gb Ethernet switch that provides connectivity to an expandable array of 100-Base-T
		switched ports.
		</para>

		<para>
		<indexterm><primary>network segments</primary></indexterm>
		<indexterm><primary>RAID</primary></indexterm>
		Considering the choice of 1 Gb Ethernet interfaces for the two local network segments,
		the aggregate network I/O capacity will be 2100 Mb/sec (about 230 MB/sec), an I/O
		demand that would require a fast disk storage I/O capability. Peak disk throughput is 
		limited by the disk subsystem chosen. It is desirable to provide the maximum 
		I/O bandwidth affordable. If a low-cost solution must be chosen, 
		3Ware IDE RAID Controllers are a good choice. These controllers can be fitted into a 
		64-bit, 66 MHz PCI-X slot. They appear to the operating system as a high-speed SCSI 
		controller that can operate at the peak of the PCI-X bandwidth (approximately 450 MB/sec).
		Alternative SCSI-based hardware RAID controllers should also be considered. Alternately,
		it makes sense to purchase well-known, branded hardware that has appropriate performance
		specifications. As a minimum, one should attempt to provide a disk subsystem that can
		deliver I/O rates of at least 100 MB/sec. 
		</para>

		<para>
		Disk storage requirements may be calculated as shown in <link linkend="ch4diskest"/>.

<example id="ch4diskest">
<title>Estimation of Disk Storage Requirements</title>
<screen>
Corporate Data: 100 MBytes/user per year
Email Storage:  500 MBytes/user per year
Applications:   5000 MBytes
Safety Buffer:  At least 50%

Given 500 Users and 2 years:
-----------------------------
        Corporate Data:  2 x 100 x 500 = 100000 MBytes = 100 GBytes
        Email Storage:   2 x 500 x 500 = 500000 MBytes = 500 GBytes
        Applications:                      5000 MBytes =   5 GBytes
                                       ----------------------------
                             Total:                      605 GBytes
             Add 50% buffer                              303 GBytes
                       Recommended Storage:              908 GBytes
</screen>
</example>
		<indexterm><primary>storage capacity</primary></indexterm>
		The preferred storage capacity should be approximately 1 Terabyte. Use of RAID level 5
		with two hot spare drives would require an 8-drive by 200 GB capacity per drive array.
		</para>

		</sect3>

	</sect2>


	<sect2>
		<title>Political Issues</title>

		<para>
		Your industry is coming under increasing accountability pressures. Increased paranoia
		is necessary so you can demonstrate that you have acted with due diligence. You must
		not trust your Internet connection.
		</para>

		<para>
		Apart from permitting more efficient management of business applications through use of
		an application server, your primary reason for the decision to implement this is that it
		gives you greater control over software licensing.
		</para>

		<para>
		<indexterm><primary>Outlook Express</primary></indexterm>
		You are well aware that the current configuration results in some performance issues
		as the size of the desktop profile grows. Given that users use Microsoft Outlook
		Express, you know that the storage implications of the <constant>.PST</constant> file
		is something that needs to be addressed later.
		</para>

	</sect2>

</sect1>

<sect1>
	<title>Implementation</title>

	<para>
	<link linkend="ch04net"/> demonstrates the overall design of the network that you will implement.
	</para>

	<para>
	The information presented here assumes that you are already familiar with many basic steps.
	As this stands, the details provided already extend well beyond just the necessities of
	Samba configuration. This decision is deliberate to ensure that key determinants
	of a successful installation are not overlooked. This is the last case that documents
	the finite minutiae of DHCP and DNS server configuration. Beyond the information provided
	here, there are many other good reference books on these subjects.
	</para>

	<para>
	The &smb.conf; file has the following noteworthy features:
	</para>

	<itemizedlist>
		<listitem><para>
		The NetBIOS name of the Samba server is set to <constant>DIAMOND</constant>.
		</para></listitem>

		<listitem><para>
		The Domain name is set to <constant>PROMISES</constant>.
		</para></listitem>

		<listitem><para>
		<indexterm><primary>broadcast messages</primary></indexterm>
		<indexterm><primary>interfaces</primary></indexterm>
		<indexterm><primary>bind interfaces only</primary></indexterm>
		Ethernet interface <constant>eth0</constant> is attached to the Internet connection
		and is externally exposed. This interface is explicitly not available for Samba to use.
		Samba listens on this interface for broadcast messages but does not broadcast any
		information on <constant>eth0</constant>, nor does it accept any connections from it.
		This is achieved by way of the <parameter>interfaces</parameter> parameter and the
		<parameter>bind interfaces only</parameter> entry.
		</para></listitem>

		<listitem><para>
		<indexterm><primary>passdb backend</primary></indexterm>
		<indexterm><primary>tdbsam</primary></indexterm>
		<indexterm><primary>binary database</primary></indexterm>
		The <parameter>passdb backend</parameter> parameter specifies the creation and use
		of the <constant>tdbsam</constant> password backend. This is a binary database that
		has excellent scalability for a large number of user account entries.
		</para></listitem>

		<listitem><para>
		<indexterm><primary>WINS serving</primary></indexterm>
		<indexterm><primary>wins support</primary></indexterm>
		<indexterm><primary>name resolve order</primary></indexterm>
		WINS serving is enabled by the <smbconfoption name="wins support">Yes</smbconfoption>,
		and name resolution is set to use it by means of the
		<smbconfoption name="name resolve order">wins bcast hosts</smbconfoption> entry.
		</para></listitem>

		<listitem><para>
		<indexterm><primary>time server</primary></indexterm>
		The Samba server is configured for use by Windows clients as a time server.
		</para></listitem>

		<listitem><para>
		<indexterm><primary>CUPS</primary></indexterm>
		<indexterm><primary>printing</primary></indexterm>
		<indexterm><primary>printcap name</primary></indexterm>
		Samba is configured to directly interface with CUPS via the direct internal interface
		that is provided by CUPS libraries. This is achieved with the 
		<smbconfoption name="printing">CUPS</smbconfoption> as well as the
		<smbconfoption name="printcap name">CUPS</smbconfoption> entries.
		</para></listitem>

		<listitem><para>
		<indexterm><primary>user management</primary></indexterm>
		<indexterm><primary>group management</primary></indexterm>
		<indexterm><primary>SRVTOOLS.EXE</primary></indexterm>
		External interface scripts are provided to enable Samba to interface smoothly to
		essential operating system functions for user and group management. This is important
		to enable workstations to join the Domain and is also important so that you can use
		the Windows NT4 Domain User Manager as well as the Domain Server Manager. These tools
		are provided as part of the <filename>SRVTOOLS.EXE</filename> toolkit that can be 
		downloaded from the Microsoft FTP
		<ulink url="ftp://ftp.microsoft.com/Softlib/MSLFILES/SRVTOOLS.EXE">site</ulink>.
		</para></listitem>

		<listitem><para>
		<indexterm><primary>User Mode</primary></indexterm>
		The &smb.conf; file specifies that the Samba server will operate in (default) <parameter>
		security = user</parameter> mode<footnote><para>See <emphasis>TOSHARG2</emphasis>, Chapter 3.
		This is necessary so that Samba can act as a Domain Controller (PDC); see
		<emphasis>TOSHARG2</emphasis>, Chapter 4, for additional information.</para></footnote>
		(User Mode).
		</para></listitem>

		<listitem><para>
		<indexterm><primary>logon services</primary></indexterm>
		<indexterm><primary>logon script</primary></indexterm>
		Domain logon services as well as a Domain logon script are specified. The logon script
		will be used to add robustness to the overall network configuration.
		</para></listitem>

		<listitem><para>
		<indexterm><primary>roaming profiles</primary></indexterm>
		<indexterm><primary>logon path</primary></indexterm>
		<indexterm><primary>profile share</primary></indexterm>
		Roaming profiles are enabled through the specification of the parameter,
		<smbconfoption name="logon path">\\%L\profiles\%U</smbconfoption>. The value of this parameter translates the
		<constant>%L</constant> to the name by which the Samba server is called by the client (for this
		configuration, it translates to the name <constant>DIAMOND</constant>), and the <constant>%U</constant>
		will translate to the name of the user within the context of the connection made to the profile share.
		It is the administrator's responsibility to ensure there is a directory in the root of the
		profile share for each user. This directory must be owned by the user also. An exception to this
		requirement is when a profile is created for group use.
		</para></listitem>

		<listitem><para>
		<indexterm><primary>virus</primary></indexterm>
		<indexterm><primary>opportunistic locking</primary></indexterm>
		Precautionary veto is effected for particular Windows file names that have been targeted by 
		virus-related activity. Additionally, Microsoft Office files are vetoed from opportunistic locking
		controls. This should help to prevent lock contention-related file access problems.
		</para></listitem>

		<listitem><para>
		Every user has a private home directory on the UNIX/Linux host. This is mapped to
		a network drive that is the same for all users.
		</para></listitem>

	</itemizedlist>

	<para>
	The configuration of the server is the most complex so far. The following steps are used:
	</para>

	<orderedlist numeration="arabic">
		<listitem><para>
		Basic System Configuration
		</para></listitem>

		<listitem><para>
		Samba Configuration
		</para></listitem>

		<listitem><para>
		DHCP and DNS Server Configuration
		</para></listitem>

		<listitem><para>
		Printer Configuration
		</para></listitem>

		<listitem><para>
		Process Start-up Configuration
		</para></listitem>

		<listitem><para>
		Validation
		</para></listitem>

		<listitem><para>
		Application Share Configuration
		</para></listitem>

		<listitem><para>
		Windows Client Configuration
		</para></listitem>
	</orderedlist>

	<para>
	The following sections cover each step in logical and defined detail.
	</para>

	<sect2 id="ch4bsc">
	<title>Basic System Configuration</title>

	<para>
	<indexterm><primary>SUSE Enterprise Linux Server</primary></indexterm>
	The preparation in this section assumes that your SUSE Enterprise Linux Server 8.0 system has been
	freshly installed. It prepares basic files so that the system is ready for comprehensive
	operation in line with the network diagram shown in <link linkend="ch04net"/>.
	</para>

	<procedure>
	<title>Server Configuration Steps</title>

		<step><para>
		<indexterm><primary>hostname</primary></indexterm>
		Using the UNIX/Linux system tools, name the server <constant>server.abmas.us</constant>.
		Verify that your hostname is correctly set by running:
<screen>
&rootprompt; uname -n
server
</screen>
		An alternate method to verify the hostname is:
<screen>
&rootprompt; hostname -f
server.abmas.us
</screen>
		</para></step>

		<step><para>
		<indexterm><primary>/etc/hosts</primary></indexterm>
		<indexterm><primary>localhost</primary></indexterm>
		Edit your <filename>/etc/hosts</filename> file to include the primary names and addresses
		of all network interfaces that are on the host server. This is necessary so that during
		startup the system can resolve all its own names to the IP address prior to
		startup of the DNS server. An example of entries that should be in the 
		<filename>/etc/hosts</filename> file is:
<screen>
127.0.0.1       localhost
192.168.1.1     sleeth1.abmas.biz sleeth1 diamond
192.168.2.1     sleeth2.abmas.biz sleeth2
123.45.67.66    server.abmas.us server
</screen>
		You should check the startup order of your system. If the CUPS print server is started before
		the DNS server (<command>named</command>), you should also include an entry for the printers
		in the <filename>/etc/hosts</filename> file, as follows:
<screen>
192.168.1.20    qmsa.abmas.biz qmsa
192.168.1.30    hplj6a.abmas.biz hplj6a
192.168.2.20    qmsf.abmas.biz qmsf
192.168.2.30    hplj6f.abmas.biz hplj6f
</screen>
		<indexterm><primary>named</primary></indexterm>
		<indexterm><primary>cupsd</primary></indexterm>
		<indexterm><primary>daemon</primary></indexterm>
		The printer entries are not necessary if <command>named</command> is started prior to
		startup of <command>cupsd</command>, the CUPS daemon.
		</para></step>

		<step><para>
		<indexterm><primary>/etc/rc.d/boot.local</primary></indexterm>
		<indexterm><primary>IP forwarding</primary></indexterm>
		<indexterm><primary>/proc/sys/net/ipv4/ip_forward</primary></indexterm>
		The host server is acting as a router between the two internal network segments as well
		as for all Internet access. This necessitates that IP forwarding be enabled. This can be
		achieved by adding to the <filename>/etc/rc.d/boot.local</filename> an entry as follows:
<screen>
echo 1 > /proc/sys/net/ipv4/ip_forward
</screen>
		To ensure that your kernel is capable of IP forwarding during configuration, you may 
		wish to execute that command manually also. This setting permits the Linux system to 
		act as a router.<footnote><para>You may want to do the echo command last and include 
				"0" in the init scripts, since it opens up your network for a short time.</para></footnote>
		</para></step>

		<step><para>
		<indexterm><primary>firewall</primary></indexterm>
		<indexterm><primary>abmas-netfw.sh</primary></indexterm>
		Installation of a basic firewall and NAT facility is necessary.
		The following script can be installed in the <filename>/usr/local/sbin</filename>
		directory. It is executed from the <filename>/etc/rc.d/boot.local</filename> startup
		script. In your case, this script is called <filename>abmas-netfw.sh</filename>. The
		script contents are shown in <link linkend="ch4natfw"/>.

<example id="ch4natfw">
<title>NAT Firewall Configuration Script</title>
<screen>
#!/bin/sh
echo -e "\n\nLoading NAT firewall.\n"
IPTABLES=/usr/sbin/iptables
EXTIF="eth0"
INTIFA="eth1"
INTIFB="eth2"

/sbin/depmod -a
/sbin/modprobe ip_tables
/sbin/modprobe ip_conntrack
/sbin/modprobe ip_conntrack_ftp
/sbin/modprobe iptable_nat
/sbin/modprobe ip_nat_ftp
$IPTABLES -P INPUT DROP
$IPTABLES -F INPUT
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -F OUTPUT
$IPTABLES -P FORWARD DROP
$IPTABLES -F FORWARD

$IPTABLES -A INPUT -i lo -j ACCEPT
$IPTABLES -A INPUT -i $INTIFA -j ACCEPT
$IPTABLES -A INPUT -i $INTIFB -j ACCEPT
$IPTABLES -A INPUT -i $EXTIF -m state --state ESTABLISHED,RELATED -j ACCEPT
# Enable incoming traffic for: SSH, SMTP, DNS(tcp), HTTP, HTTPS
for i in 22 25 53 80 443
do
        $IPTABLES -A INPUT -i $EXTIF -p tcp --dport $i  -j ACCEPT
done
# Allow DNS(udp)
$IPTABLES -A INPUT -i $EXTIF -p udp -dport 53  -j ACCEPT
echo "Allow all connections OUT and only existing and specified ones IN"
$IPTABLES -A FORWARD -i $EXTIF -o $INTIFA -m state \
                                  --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -i $EXTIF -o $INTIFB -m state \
                                  --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -i $INTIFA -o $EXTIF -j ACCEPT
$IPTABLES -A FORWARD -i $INTIFB -o $EXTIF -j ACCEPT
$IPTABLES -A FORWARD -j LOG
echo "   Enabling SNAT (MASQUERADE) functionality on $EXTIF"
$IPTABLES -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE
echo "1" > /proc/sys/net/ipv4/ip_forward
echo -e "\nNAT firewall done.\n"
</screen>
</example>
		</para></step>

		<step><para>
		Execute the following to make the script executable:
<screen>
&rootprompt; chmod 755 /usr/local/sbin/abmas-natfw.sh
</screen>
		You must now edit <filename>/etc/rc.d/boot.local</filename> to add an entry
		that runs your <command>abmas-natfw.sh</command> script. The following
		entry works for you:
<screen>
#! /bin/sh
#
# Copyright (c) 2002 SUSE Linux AG Nuernberg, Germany. 
# All rights reserved.
#
# Author: Werner Fink, 1996
#         Burchard Steinbild, 1996
#
# /etc/init.d/boot.local
#
# script with local commands to be executed from init on system startup
#
# Here you should add things that should happen directly after booting
# before we're going to the first run level.
#
/usr/local/sbin/abmas-natfw.sh
</screen>
		</para></step>
	</procedure>

	<para>
	<indexterm><primary>/etc/hosts</primary></indexterm>
	The server is now ready for Samba configuration. During the validation step, you remove
	the entry for the Samba server <constant>diamond</constant> from the <filename>/etc/hosts</filename>
	file. This is done after you are satisfied that DNS-based name resolution is functioning correctly.
	</para>

	</sect2>

	<sect2>
	<title>Samba Configuration</title>

	<para>
	When you have completed this section, the Samba server is ready for testing and validation;
	however, testing and validation have to wait until DHCP, DNS, and printing (CUPS) services have 
	been configured.
	</para>

	<procedure>
	<title>Samba Configuration Steps</title>

		<step><para>
		Install the Samba-3 binary RPM from the Samba-Team FTP site. Assuming that the binary
		RPM file is called <filename>samba-3.0.20-1.i386.rpm</filename>, one way to install this
		file is as follows:
<screen>
&rootprompt; rpm -Uvh samba-3.0.20-1.i386.rpm
</screen>
		This operation must be performed while logged in as the <command>root</command> user.
		Successful operation is clearly indicated. If this installation should fail for any reason,
		refer to the operating system manufacturer's documentation for guidance.
		</para></step>

		<step><para>
		Install the &smb.conf; file shown in <link linkend="promisnet"/>, <link linkend="promisnetsvca"/>,
		and <link linkend="promisnetsvcb"/>. Concatenate (join) all three files to make a single &smb.conf;
		file. The final, fully qualified path for this file should be <filename>/etc/samba/smb.conf</filename>.

<example id="promisnet">
<title>130 User Network with <emphasis>tdbsam</emphasis> &smbmdash; [globals] Section</title>
<smbconfblock>
<smbconfcomment>Global parameters</smbconfcomment>
<smbconfsection name="[global]"/>
<smbconfoption name="workgroup">PROMISES</smbconfoption>
<smbconfoption name="netbios name">DIAMOND</smbconfoption>
<smbconfoption name="interfaces">eth1, eth2, lo</smbconfoption>
<smbconfoption name="bind interfaces only">Yes</smbconfoption>
<smbconfoption name="passdb backend">tdbsam</smbconfoption>
<smbconfoption name="pam password change">Yes</smbconfoption>
<smbconfoption name="passwd program">/usr/bin/passwd %u</smbconfoption>
<smbconfoption name="passwd chat">*New*Password* %n\n *Re-enter*new*password*%n\n *Password*changed*</smbconfoption>
<smbconfoption name="username map">/etc/samba/smbusers</smbconfoption>
<smbconfoption name="unix password sync">Yes</smbconfoption>
<smbconfoption name="log level">1</smbconfoption>
<smbconfoption name="syslog">0</smbconfoption>
<smbconfoption name="log file">/var/log/samba/%m</smbconfoption>
<smbconfoption name="max log size">50</smbconfoption>
<smbconfoption name="smb ports">139</smbconfoption>
<smbconfoption name="name resolve order">wins bcast hosts</smbconfoption>
<smbconfoption name="time server">Yes</smbconfoption>
<smbconfoption name="printcap name">CUPS</smbconfoption>
<smbconfoption name="show add printer wizard">No</smbconfoption>
<smbconfoption name="add user script">/usr/sbin/useradd -m '%u'</smbconfoption>
<smbconfoption name="delete user script">/usr/sbin/userdel -r '%u'</smbconfoption>
<smbconfoption name="add group script">/usr/sbin/groupadd '%g'</smbconfoption>
<smbconfoption name="delete group script">/usr/sbin/groupdel '%g'</smbconfoption>
<smbconfoption name="add user to group script">/usr/sbin/usermod -G '%g' '%u'</smbconfoption>
<smbconfoption name="add machine script">/usr/sbin/useradd -s /bin/false -d /tmp '%u'</smbconfoption>
<smbconfoption name="shutdown script">/var/lib/samba/scripts/shutdown.sh</smbconfoption>
<smbconfoption name="abort shutdown script">/sbin/shutdown -c</smbconfoption>
<smbconfoption name="logon script">scripts\logon.bat</smbconfoption>
<smbconfoption name="logon path">\\%L\profiles\%U</smbconfoption>
<smbconfoption name="logon drive">X:</smbconfoption>
<smbconfoption name="logon home">\\%L\%U</smbconfoption>
<smbconfoption name="domain logons">Yes</smbconfoption>
<smbconfoption name="preferred master">Yes</smbconfoption>
<smbconfoption name="wins support">Yes</smbconfoption>
<smbconfoption name="utmp">Yes</smbconfoption>
<smbconfoption name="map acl inherit">Yes</smbconfoption>
<smbconfoption name="printing">cups</smbconfoption>
<smbconfoption name="cups options">Raw</smbconfoption>
<smbconfoption name="veto files">/*.eml/*.nws/*.{*}/</smbconfoption>
<smbconfoption name="veto oplock files">/*.doc/*.xls/*.mdb/</smbconfoption>
</smbconfblock>
</example>

<example id="promisnetsvca">
<title>130 User Network with <emphasis>tdbsam</emphasis> &smbmdash; Services Section Part A</title>
<smbconfblock>
<smbconfsection name="[homes]"/>
<smbconfoption name="comment">Home Directories</smbconfoption>
<smbconfoption name="valid users">%S</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>
<smbconfoption name="browseable">No</smbconfoption>

<smbconfsection name="[printers]"/>
<smbconfoption name="comment">SMB Print Spool</smbconfoption>
<smbconfoption name="path">/var/spool/samba</smbconfoption>
<smbconfoption name="guest ok">Yes</smbconfoption>
<smbconfoption name="printable">Yes</smbconfoption>
<smbconfoption name="use client driver">Yes</smbconfoption>
<smbconfoption name="default devmode">Yes</smbconfoption>
<smbconfoption name="browseable">No</smbconfoption>

<smbconfsection name="[netlogon]"/>
<smbconfoption name="comment">Network Logon Service</smbconfoption>
<smbconfoption name="path">/var/lib/samba/netlogon</smbconfoption>
<smbconfoption name="guest ok">Yes</smbconfoption>
<smbconfoption name="locking">No</smbconfoption>

<smbconfsection name="[profiles]"/>
<smbconfoption name="comment">Profile Share</smbconfoption>
<smbconfoption name="path">/var/lib/samba/profiles</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>
<smbconfoption name="profile acls">Yes</smbconfoption>

<smbconfsection name="[accounts]"/>
<smbconfoption name="comment">Accounting Files</smbconfoption>
<smbconfoption name="path">/data/accounts</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>
</smbconfblock>
</example>

<example id="promisnetsvcb">
<title>130 User Network with <emphasis>tdbsam</emphasis> &smbmdash; Services Section Part B</title>
<smbconfblock>
<smbconfsection name="[service]"/>
<smbconfoption name="comment">Financial Services Files</smbconfoption>
<smbconfoption name="path">/data/service</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>

<smbconfsection name="[pidata]"/>
<smbconfoption name="comment">Property Insurance Files</smbconfoption>
<smbconfoption name="path">/data/pidata</smbconfoption>
<smbconfoption name="read only">No</smbconfoption>

<smbconfsection name="[apps]"/>
<smbconfoption name="comment">Application Files</smbconfoption>
<smbconfoption name="path">/apps</smbconfoption>
<smbconfoption name="read only">Yes</smbconfoption>
<smbconfoption name="admin users">bjordan</smbconfoption>
</smbconfblock>
</example>
		</para></step>

		<step><para>
	      <indexterm><primary>administrator</primary></indexterm><indexterm>
		<primary>smbpasswd</primary>
	      </indexterm>
		Add the <constant>root</constant> user to the password backend as follows:
<screen>
&rootprompt; smbpasswd -a root
New SMB password: XXXXXXXX
Retype new SMB password: XXXXXXXX
&rootprompt;
</screen>
		The <constant>root</constant> account is the UNIX equivalent of the Windows Domain Administrator.
		This account is essential in the regular maintenance of your Samba server. It must never be
		deleted. If for any reason the account is deleted, you may not be able to recreate this account
		without considerable trouble.
		</para></step>

		<step><para>
		<indexterm><primary>username map</primary></indexterm>
                Create the username map file to permit the <constant>root</constant> account to be called
                <constant>Administrator</constant> from the Windows network environment. To do this, create
                the file <filename>/etc/samba/smbusers</filename> with the following contents:
<screen>
####
# User mapping file
####
# File Format
# -----------
# Unix_ID = Windows_ID
#
# Examples:
# root = Administrator
# janes = "Jane Smith"
# jimbo = Jim Bones
#
# Note: If the name contains a space it must be double quoted.
#       In the example above the name 'jimbo' will be mapped to Windows
#       user names 'Jim' and 'Bones' because the space was not quoted.
#######################################################################
root = Administrator
####
# End of File
####
</screen>
		</para></step>

		<step><para>
		<indexterm><primary>initGrps.sh</primary></indexterm>
		<indexterm><primary>net</primary><secondary>groupmap</secondary><tertiary>add</tertiary></indexterm>
		<indexterm><primary>net</primary><secondary>groupmap</secondary><tertiary>modify</tertiary></indexterm>
		<indexterm><primary>net</primary><secondary>groupmap</secondary><tertiary>list</tertiary></indexterm>
                Create and map Windows Domain Groups to UNIX groups. A sample script is provided in <link linkend="small"/>,
                <link linkend="initGrps"/>. Create a file containing this script. We called ours
                <filename>/etc/samba/initGrps.sh</filename>. Set this file so it can be executed,
                and then execute the script. Sample output should be as follows:

<example id="ch4initGrps">
<title>Script to Map Windows NT Groups to UNIX Groups</title>
<indexterm><primary>initGrps.sh</primary></indexterm>
<screen>
#!/bin/bash
#
# initGrps.sh
#

# Create UNIX groups
groupadd acctsdep
groupadd finsrvcs

# Map Windows Domain Groups to UNIX groups
net groupmap add ntgroup="Domain Admins"  unixgroup=root type=d
net groupmap add ntgroup="Domain Users"   unixgroup=users type=d
net groupmap add ntgroup="Domain Guests"  unixgroup=nobody type=d

# Add Functional Domain Groups
net groupmap add ntgroup="Accounts Dept"  unixgroup=acctsdep type=d
net groupmap add ntgroup="Financial Services" unixgroup=finsrvcs type=d
net groupmap add ntgroup="Insurance Group"     unixgroup=piops type=d

# Map Windows NT machine local groups to local UNIX groups
# Mapping of local groups is not necessary and not functional
# for this installation.
</screen>
</example>

<screen>
&rootprompt; chmod 755 initGrps.sh
&rootprompt; /etc/samba # ./initGrps.sh
Updated mapping entry for Domain Admins
Updated mapping entry for Domain Users
Updated mapping entry for Domain Guests
No rid or sid specified, choosing algorithmic mapping
Successfully added group Accounts Dept to the mapping db
No rid or sid specified, choosing algorithmic mapping
Successfully added group Domain Guests to the mapping db

&rootprompt; /etc/samba # net groupmap list | sort
Account Operators (S-1-5-32-548) -> -1
Accounts Dept (S-1-5-21-179504-2437109-488451-2003) -> acctsdep
Administrators (S-1-5-32-544) -> -1
Backup Operators (S-1-5-32-551) -> -1
Domain Admins (S-1-5-21-179504-2437109-488451-512) -> root
Domain Guests (S-1-5-21-179504-2437109-488451-514) -> nobody
Domain Users (S-1-5-21-179504-2437109-488451-513) -> users
Financial Services (S-1-5-21-179504-2437109-488451-2005) -> finsrvcs
Guests (S-1-5-32-546) -> -1
Power Users (S-1-5-32-547) -> -1
Print Operators (S-1-5-32-550) -> -1
Replicators (S-1-5-32-552) -> -1
System Operators (S-1-5-32-549) -> -1
Users (S-1-5-32-545) -> -1
</screen>
		</para></step>

		<step><para>
		<indexterm><primary>useradd</primary></indexterm>
		<indexterm><primary>adduser</primary></indexterm>
		<indexterm><primary>passwd</primary></indexterm>
		<indexterm><primary>smbpasswd</primary></indexterm>
		<indexterm><primary>/etc/passwd</primary></indexterm>
		<indexterm><primary>password</primary><secondary>backend</secondary></indexterm>
		<indexterm><primary>user</primary><secondary>management</secondary></indexterm>
		There is one preparatory step without which you will not have a working Samba 
		network environment. You must add an account for each network user. 
                For each user who needs to be given a Windows Domain account, make an entry in the
                <filename>/etc/passwd</filename> file as well as in the Samba password backend.
                Use the system tool of your choice to create the UNIX system account, and use the Samba
                <command>smbpasswd</command> to create a Domain user account.
                There are a number of tools for user management under UNIX, such as
                <command>useradd</command>, and <command>adduser</command>, as well as a plethora of custom
                tools. You also want to create a home directory for each user.
		You can do this by executing the following steps for each user:
<screen>
&rootprompt; useradd -m <parameter>username</parameter>
&rootprompt; passwd <parameter>username</parameter>
Changing password for <parameter>username</parameter>.
New password: XXXXXXXX
Re-enter new password: XXXXXXXX
Password changed
&rootprompt; smbpasswd -a <parameter>username</parameter>
New SMB password: XXXXXXXX
Retype new SMB password: XXXXXXXX
Added user <parameter>username</parameter>.
</screen>
		You do of course use a valid user login ID in place of <parameter>username</parameter>.
		</para></step>

		<step><para>
		<indexterm><primary>file system</primary><secondary>access control</secondary></indexterm>
		<indexterm><primary>file system</primary><secondary>permissions</secondary></indexterm>
		<indexterm><primary>group membership</primary></indexterm>
                Using the preferred tool for your UNIX system, add each user to the UNIX groups created
                previously as necessary. File system access control will be based on UNIX group membership.
                </para></step>

                <step><para>
                Create the directory mount point for the disk subsystem that can be mounted to provide
                data storage for company files. In this case the mount point is indicated in the &smb.conf;
                file is <filename>/data</filename>. Format the file system as required, and mount the formatted
                file system partition using appropriate system tools.
                </para></step>

                <step><para>
		<indexterm><primary>file system</primary><secondary>permissions</secondary></indexterm>
                Create the top-level file storage directories for data and applications as follows:
<screen>
&rootprompt; mkdir -p /data/{accounts,finsrvcs}
&rootprompt; mkdir -p /apps
&rootprompt; chown -R root:root /data
&rootprompt; chown -R root:root /apps
&rootprompt; chown -R bjordan:acctsdep /data/accounts
&rootprompt; chown -R bjordan:finsrvcs /data/finsrvcs
&rootprompt; chmod -R ug+rwxs,o-rwx /data
&rootprompt; chmod -R ug+rwx,o+rx-w /apps
</screen>
                Each department is responsible for creating its own directory structure within the departmental
                share. The directory root of the <command>accounts</command> share is <filename>/data/accounts</filename>.
                The directory root of the <command>finsvcs</command> share is <filename>/data/finsvcs</filename>.
		The <filename>/apps</filename> directory is the root of the <constant>apps</constant> share
		that provides the application server infrastructure.
		</para></step>

		<step><para>
		The &smb.conf; file specifies an infrastructure to support roaming profiles and network
		logon services. You can now create the file system infrastructure to provide the
		locations on disk that these services require. Adequate planning is essential,
		since desktop profiles can grow to be quite large. For planning purposes, a minimum of
		200 MB of storage should be allowed per user for profile storage. The following
		commands create the directory infrastructure needed:
<screen>
&rootprompt; mkdir -p /var/spool/samba 
&rootprompt; mkdir -p /var/lib/samba/{netlogon/scripts,profiles}
&rootprompt; chown -R root:root /var/spool/samba
&rootprompt; chown -R root:root /var/lib/samba
&rootprompt; chmod a+rwxt /var/spool/samba
&rootprompt; chmod 2775 /var/lib/samba/profiles
&rootprompt; chgrp users /var/lib/samba/profiles
</screen>
		For each user account that is created on the system, the following commands should be
		executed:
<screen>
&rootprompt; mkdir /var/lib/samba/profiles/'username'
&rootprompt; chown 'username':users /var/lib/samba/profiles/'username'
&rootprompt; chmod ug+wrx,o+rx,-w /var/lib/samba/profiles/'username'
</screen>
		</para></step>

		<step><para>
		<indexterm><primary>logon scrip</primary></indexterm>
		<indexterm><primary>unix2dos</primary></indexterm>
		<indexterm><primary>dos2unix</primary></indexterm>
		Create a logon script. It is important that each line is correctly terminated with
		a carriage return and line-feed combination (i.e., DOS encoding). The following procedure
		works if the right tools (<constant>unix2dos</constant> and <constant>dos2unix</constant>) are installed.
		First, create a file called <filename>/var/lib/samba/netlogon/scripts/logon.bat.unix</filename>
		with the following contents:
<screen>
net time \\diamond /set /yes
net use h: /home
net use p: \\diamond\apps
</screen>
		Convert the UNIX file to a DOS file using the <command>unix2dos</command> as shown here:
<screen>
&rootprompt; unix2dos &lt; /var/lib/samba/netlogon/scripts/logon.bat.unix \
	&gt; /var/lib/samba/netlogon/scripts/logon.bat
</screen>
		</para></step>
	</procedure>

	</sect2>

	<sect2 id="ch4dhcpdns">
	<title>Configuration of DHCP and DNS Servers</title>

	<para>
	DHCP services are a basic component of the entire network client installation. DNS operation is
	foundational to Internet access as well as to trouble-free operation of local networking. When
	you have completed this section, the server should be ready for solid duty operation.
	</para>

	<procedure>
	<title>DHCP and DNS Server Configuration Steps</title>

		<step><para>
		<indexterm><primary>/etc/dhcpd.conf</primary></indexterm>
		Create a file called <filename>/etc/dhcpd.conf</filename> with the contents as
		shown in <link linkend="prom-dhcp"/>.

<example id="prom-dhcp">
<title>DHCP Server Configuration File &smbmdash; <filename>/etc/dhcpd.conf</filename></title>
<screen>
# Abmas Accounting Inc.
default-lease-time 86400;
max-lease-time 172800;
default-lease-time 86400;
option ntp-servers 192.168.1.1;
option domain-name "abmas.biz";
option domain-name-servers 192.168.1.1, 192.168.2.1;
option netbios-name-servers 192.168.1.1, 192.168.2.1;
option netbios-node-type 8;       ### Node type = Hybrid ###
ddns-updates on;                  ### Dynamic DNS enabled ###
ddns-update-style interim;

subnet 192.168.1.0 netmask 255.255.255.0 {
        range dynamic-bootp 192.168.1.128 192.168.1.254;
        option subnet-mask 255.255.255.0;
        option routers 192.168.1.1;
        allow unknown-clients;
        host qmsa {
                hardware ethernet 08:00:46:7a:35:e4;
                fixed-address 192.168.1.20;
                }
        host hplj6a {
                hardware ethernet 00:03:47:cb:81:e0;
                fixed-address 192.168.1.30;
                }
        }
subnet 192.168.2.0 netmask 255.255.255.0 {
        range dynamic-bootp 192.168.2.128 192.168.2.254;
        option subnet-mask 255.255.255.0;
        option routers 192.168.2.1;
        allow unknown-clients;
        host qmsf {
                hardware ethernet 01:04:31:db:e1:c0;
                fixed-address 192.168.1.20;
        	}
        host hplj6f {
                hardware ethernet 00:03:47:cf:83:e2;
                fixed-address 192.168.2.30;
                }
	}
subnet 127.0.0.0 netmask 255.0.0.0 {
        }
subnet 123.45.67.64 netmask 255.255.255.252 {
        }
</screen>
</example>
		</para></step>

		<step><para>
		<indexterm><primary>/etc/named.conf</primary></indexterm>
		Create a file called <filename>/etc/named.conf</filename> that has the combined contents
		of the <link linkend="ch4namedcfg"/>, <link linkend="ch4namedvarfwd"/>, and
		<link linkend="ch4namedvarrev"/> files that are concatenated (merged) in this
		specific order.
		</para></step>

		<step><para>
		Create the files shown in their respective directories as shown in <link linkend="namedrscfiles">DNS
		(named) Resource Files</link>.

			<table id="namedrscfiles">
				<title>DNS (named) Resource Files</title>
				<tgroup cols="2">
					<colspec align="left"/>
					<colspec align="left"/>
					<thead>
						<row>
							<entry>Reference</entry>
							<entry>File Location</entry>
						</row>
					</thead>
					<tbody>
						<row>
							<entry><link linkend="loopback"/></entry>
							<entry>/var/lib/named/localhost.zone</entry>
						</row>
						<row>
							<entry><link linkend="dnsloopy"/></entry>
							<entry>/var/lib/named/127.0.0.zone</entry>
						</row>
						<row>
							<entry><link linkend="roothint"/></entry>
							<entry>/var/lib/named/root.hint</entry>
						</row>
						<row>
							<entry><link linkend="abmasbiz"/></entry>
							<entry>/var/lib/named/master/abmas.biz.hosts</entry>
						</row>
						<row>
							<entry><link linkend="abmasus"/></entry>
							<entry>/var/lib/named/abmas.us.hosts</entry>
						</row>
						<row>
							<entry><link linkend="eth1zone"/></entry>
							<entry>/var/lib/named/192.168.1.0.rev</entry>
						</row>
						<row>
							<entry><link linkend="eth2zone"/></entry>
							<entry>/var/lib/named/192.168.2.0.rev</entry>
						</row>
					</tbody>
				</tgroup>
			</table>

<example id="ch4namedcfg">
<title>DNS Master Configuration File &smbmdash; <filename>/etc/named.conf</filename> Master Section</title>
<indexterm><primary>/etc/named.conf</primary></indexterm>
<screen>
###
# Abmas Biz DNS Control File
###
# Date: November 15, 2003
###
options {
	directory "/var/lib/named";
	forwarders {
		123.45.12.23;
		};
	forward first;
	listen-on {
		mynet;
		};
	auth-nxdomain yes;
	multiple-cnames yes;
	notify no;
};

zone "." in {
	type hint;
	file "root.hint";
};

zone "localhost" in {
	type master;
	file "localhost.zone";
};

zone "0.0.127.in-addr.arpa" in {
	type master;
	file "127.0.0.zone";
};

acl mynet {
	192.168.1.0/24;
	192.168.2.0/24;
	127.0.0.1;
};

acl seconddns {
	123.45.54.32;
};

</screen>
</example>

<example id="ch4namedvarfwd">
<title>DNS Master Configuration File &smbmdash; <filename>/etc/named.conf</filename> Forward Lookup Definition Section</title>
<screen>
zone "abmas.biz" {
	type master;
	file "/var/lib/named/master/abmas.biz.hosts";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
	allow-update {
		mynet;
	};
};

zone "abmas.us" {
	type master;
	file "/var/lib/named/master/abmas.us.hosts";
	allow-query {
		any;
	};
	allow-transfer {
		seconddns;
	};
};
</screen>
</example>

<example id="ch4namedvarrev">
<title>DNS Master Configuration File &smbmdash; <filename>/etc/named.conf</filename> Reverse Lookup Definition Section</title>
<screen>
zone "1.168.192.in-addr.arpa" {
	type master;
	file "/var/lib/named/master/192.168.1.0.rev";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
	allow-update {
		mynet;
	};
};

zone "2.168.192.in-addr.arpa" {
	type master;
	file "/var/lib/named/master/192.168.2.0.rev";
	allow-query {
		mynet;
	};
	allow-transfer {
		mynet;
	};
	allow-update {
		mynet;
	};
};
</screen>
</example>

<example id="eth1zone">
<title>DNS 192.168.1 Reverse Zone File</title>
<screen>
$ORIGIN .
$TTL 38400	; 10 hours 40 minutes
1.168.192.in-addr.arpa	IN SOA	sleeth.abmas.biz. root.abmas.biz. (
				2003021825 ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				38400      ; minimum (10 hours 40 minutes)
				)
			NS	sleeth1.abmas.biz.
$ORIGIN 1.168.192.in-addr.arpa.
1			PTR	sleeth1.abmas.biz.
20			PTR	qmsa.abmas.biz.
30			PTR	hplj6a.abmas.biz.
</screen>
</example>

<example id="eth2zone">
<title>DNS 192.168.2 Reverse Zone File</title>
<screen>
$ORIGIN .
$TTL 38400	; 10 hours 40 minutes
2.168.192.in-addr.arpa	IN SOA	sleeth.abmas.biz. root.abmas.biz. (
				2003021825 ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				38400      ; minimum (10 hours 40 minutes)
				)
			NS	sleeth2.abmas.biz.
$ORIGIN 2.168.192.in-addr.arpa.
1			PTR	sleeth2.abmas.biz.
20			PTR	qmsf.abmas.biz.
30			PTR	hplj6f.abmas.biz.
</screen>
</example>

<example id="abmasbiz">
<title>DNS Abmas.biz Forward Zone File</title>
<screen>
$ORIGIN .
$TTL 38400      ; 10 hours 40 minutes
abmas.biz       IN SOA  sleeth1.abmas.biz. root.abmas.biz. (
                                2003021833 ; serial
                                10800      ; refresh (3 hours)
                                3600       ; retry (1 hour)
                                604800     ; expire (1 week)
                                38400      ; minimum (10 hours 40 minutes)
                                )
                        NS      dns.abmas.biz.
                        MX      10 mail.abmas.biz.
$ORIGIN abmas.biz.
sleeth1                 A       192.168.1.1
sleeth2                 A       192.168.2.1
qmsa                    A       192.168.1.20
hplj6a                  A       192.168.1.30
qmsf                    A       192.168.2.20
hplj6f                  A       192.168.2.30
dns                     CNAME   sleeth1
diamond                 CNAME   sleeth1
mail                    CNAME   sleeth1
</screen>
</example>

<example id="abmasus">
<title>DNS Abmas.us Forward Zone File</title>
<screen>
$ORIGIN .
$TTL 38400      ; 10 hours 40 minutes
abmas.us        IN SOA  server.abmas.us. root.abmas.us. (
                                2003021833 ; serial
                                10800      ; refresh (3 hours)
                                3600       ; retry (1 hour)
                                604800     ; expire (1 week)
                                38400      ; minimum (10 hours 40 minutes)
                                )
                        NS      dns.abmas.us.
                        NS      dns2.abmas.us.
                        MX      10 mail.abmas.us.
$ORIGIN abmas.us.
server                  A       123.45.67.66
dns2                    A       123.45.54.32
gw                      A       123.45.67.65
www                     CNAME   server
mail                    CNAME   server
dns                     CNAME   server
</screen>
</example>

		</para></step>

		<step><para>
	      <indexterm><primary>/etc/resolv.conf</primary></indexterm><indexterm>
		<primary>name resolution</primary>
	      </indexterm>
		All DNS name resolution should be handled locally. To ensure that the server is configured
		correctly to handle this, edit <filename>/etc/resolv.conf</filename> to have the following
		content:
<screen>
search abmas.us abmas.biz
nameserver 127.0.0.1
nameserver 123.45.54.23
</screen>
	      <indexterm>
		<primary>DNS server</primary>
	      </indexterm>
		This instructs the name resolver function (when configured correctly) to ask the DNS server
		that is running locally to resolve names to addresses. In the event that the local name server
		is not available, ask the name server provided by the ISP. The latter, of course, does not resolve
		purely local names to IP addresses.
		</para></step>

		<step><para>
		<indexterm><primary>/etc/nsswitch.conf</primary></indexterm>
		The final step is to edit the <filename>/etc/nsswitch.conf</filename> file.
		This file controls the operation of the various resolver libraries that are part of the Linux
		Glibc libraries. Edit this file so that it contains the following entries:
<screen>
hosts:      files dns wins
</screen>
		</para></step>
	</procedure>

	<para>
	The basic DHCP and DNS services are now ready for validation testing. Before you can proceed,
	there are a few more steps along the road. First, configure the print spooling and print
	processing system.  Then you can configure the server so that all services
	start automatically on reboot. You must also manually start all services prior to validation testing.
	</para>

	</sect2>

	<sect2 id="ch4ptrcfg">
	<title>Printer Configuration</title>

	<para>
	Network administrators who are new to CUPS based-printing typically experience some difficulty mastering
	its powerful features. The steps outlined in this section are designed to navigate around the distractions
	of learning CUPS. Instead of implementing smart features and capabilities, our approach is to use it as a
	transparent print queue that performs no filtering, and only minimal handling of each print job that is
	submitted to it. In other words, our configuration turns CUPS into a raw-mode print queue. This means that
	the correct printer driver must be installed on all clients.
	</para>

	<procedure>
	<title>Printer Configuration Steps</title>

		<step><para>
		Configure each printer to be a DHCP client, carefully following the manufacturer's guidelines.
		</para></step>

                <step><para>
                Follow the instructions in the printer manufacturer's manuals to permit printing to port 9100.
		Use any other port the manufacturer specifies for direct-mode raw printing, and adjust the
		port as necessary in the following example commands.
                This allows the CUPS spooler to print using raw mode protocols.
                <indexterm><primary>CUPS</primary></indexterm>
                <indexterm><primary>raw printing</primary></indexterm>
                </para></step>

                <step><para>
	      <indexterm><primary>CUPS</primary><secondary>queue</secondary></indexterm><indexterm>
		<primary>lpadmin</primary>
	      </indexterm>
                Configure the CUPS Print Queues as follows:
<screen>
&rootprompt; lpadmin -p qmsa -v socket://qmsa.abmas.biz:9100 -E
&rootprompt; lpadmin -p hplj6a -v socket://hplj6a.abmas.biz:9100 -E
&rootprompt; lpadmin -p qmsf -v socket://qmsf.abmas.biz:9100 -E
&rootprompt; lpadmin -p hplj6f -v socket://hplj6f.abmas.biz:9100 -E
</screen>
                <indexterm><primary>print filter</primary></indexterm>
                This creates the necessary print queues with no assigned print filter.
                </para></step>

	  <step><para><indexterm>
		<primary>enable</primary>
	      </indexterm>
		Print queues may not be enabled at creation. Use <command>lpc stat</command> to check
		the status of the print queues and, if necessary, make certain that the queues you have 
		just created are enabled by executing the following:
<screen>
&rootprompt; /usr/bin/enable qmsa
&rootprompt; /usr/bin/enable hplj6a
&rootprompt; /usr/bin/enable qmsf
&rootprompt; /usr/bin/enable hplj6f
</screen>
		</para></step>

	  <step><para><indexterm>
		<primary>accept</primary>
	      </indexterm>
		Even though your print queues may be enabled, it is still possible that they
		are not accepting print jobs. A print queue services incoming printing
		requests only when configured to do so. Ensure that your print queues are
		set to accept incoming jobs by executing the following commands:
<screen>
&rootprompt; /usr/sbin/accept qmsa
&rootprompt; /usr/sbin/accept hplj6a
&rootprompt; /usr/sbin/accept qmsf
&rootprompt; /usr/sbin/accept hplj6f
</screen>
		</para></step>

                <step><para>
                <indexterm><primary>mime type</primary></indexterm>
                <indexterm><primary>/etc/mime.convs</primary></indexterm>
                <indexterm><primary>application/octet-stream</primary></indexterm>
                Edit the file <filename>/etc/cups/mime.convs</filename> to uncomment the line:
<screen>
application/octet-stream     application/vnd.cups-raw      0     -
</screen>
                </para></step>

                <step><para>
                <indexterm><primary>/etc/mime.types</primary></indexterm>
                Edit the file <filename>/etc/cups/mime.types</filename> to uncomment the line:
<screen>
application/octet-stream
</screen>
                </para></step>

		<step><para>
		Printing drivers are installed on each network client workstation.
		</para></step>
	</procedure>

	<para>
	Note: If the parameter <parameter>cups options = Raw</parameter> is specified in the &smb.conf; file,
	the last two steps can be omitted with CUPS version 1.1.18, or later.
	</para>

	<para>
	The UNIX system print queues have been configured and are ready for validation testing.
	</para>

	</sect2>

	<sect2 id="procstart">
	<title>Process Startup Configuration</title>

	<para>
	<indexterm><primary>chkconfig</primary></indexterm>
	There are two essential steps to process startup configuration. First, the process
	must be configured so that it automatically restarts each time the server
	is rebooted. This step involves use of the <command>chkconfig</command> tool that
	creates the appropriate symbolic links from the master daemon control file that is
	located in the <filename>/etc/rc.d</filename> directory, to the <filename>/etc/rc'x'.d</filename>
	directories. Links are created so that when the system run level is changed, the
	necessary start or kill script is run.
	</para>

	<para>
	<indexterm><primary>/etc/xinetd.d</primary></indexterm>
	<indexterm><primary>inetd</primary></indexterm>
	<indexterm><primary>xinetd</primary></indexterm>
	<indexterm><primary>chkconfig</primary></indexterm>
	<indexterm><primary>super daemon</primary></indexterm>
	In the event that a service is not run as a daemon, but via the internetworking
	super daemon (<command>inetd</command> or <command>xinetd</command>), then the <command>chkconfig</command>
	tool makes the necessary entries in the <filename>/etc/xinetd.d</filename> directory
	and sends a hang-up (HUP) signal to the the super daemon, thus forcing it to
	re-read its control files.
	</para>

	<para>
	Last, each service must be started to permit system validation to proceed.
	</para>

	<procedure>
                <step><para>
                Use the standard system tool to configure each service to restart
                automatically at every system reboot. For example,
                <indexterm><primary>chkconfig</primary></indexterm>
<screen>
&rootprompt; chkconfig dhpcd on
&rootprompt; chkconfig named on
&rootprompt; chkconfig cups on
&rootprompt; chkconfig smb on
</screen>
		</para></step>

		<step><para>
                <indexterm><primary>starting dhcpd</primary></indexterm>
                <indexterm><primary>starting samba</primary></indexterm>
                <indexterm><primary>starting CUPS</primary></indexterm>
		Now start each service to permit the system to be validated.
		Execute each of the following in the sequence shown:

<screen>
&rootprompt; /etc/rc.d/init.d/dhcpd restart
&rootprompt; /etc/rc.d/init.d/named restart
&rootprompt; /etc/rc.d/init.d/cups restart
&rootprompt; /etc/rc.d/init.d/smb restart
</screen>
                </para></step>
	</procedure>

	</sect2>

	<sect2 id="ch4valid">
	<title>Validation</title>

	<para>
	<indexterm><primary>validation</primary></indexterm>
	Complex networking problems are most often caused by simple things that are poorly or incorrectly
	configured. The validation process adopted here should be followed carefully; it is the result of the
	experience gained from years of making and correcting the most common mistakes. Shortcuts often lead to basic errors. You should
	refrain from taking shortcuts, from making basic assumptions, and from not exercising due process
	and diligence in network validation. By thoroughly testing and validating every step in the process
	of network installation and configuration, you can save yourself from sleepless nights and restless
	days. A well debugged network is a foundation for happy network users and network administrators. 
	Later in this book you learn how to make users happier. For now, it is enough to learn to 
	validate. Let's get on with it.
	</para>

		<procedure>
		<title>Server Validation Steps</title>

			<step><para>
			<indexterm><primary>/etc/nsswitch.conf</primary></indexterm>
			One of the most important facets of Samba configuration is to ensure that
			name resolution functions correctly. You can check name resolution
			with a few simple tests. The most basic name resolution is provided from the
			<filename>/etc/hosts</filename> file. To test its operation, make a
			temporary edit to the <filename>/etc/nsswitch.conf</filename> file. Using
			your favorite editor, change the entry for <constant>hosts</constant> to read:
<screen>
hosts:     files
</screen>
			When you have saved this file, execute the following command:
<screen>
&rootprompt; ping diamond
PING sleeth1.abmas.biz (192.168.1.1) 56(84) bytes of data.
64 bytes from sleeth1 (192.168.1.1): icmp_seq=1 ttl=64 time=0.131 ms
64 bytes from sleeth1 (192.168.1.1): icmp_seq=2 ttl=64 time=0.179 ms
64 bytes from sleeth1 (192.168.1.1): icmp_seq=3 ttl=64 time=0.192 ms
64 bytes from sleeth1 (192.168.1.1): icmp_seq=4 ttl=64 time=0.191 ms

--- sleeth1.abmas.biz ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3016ms
rtt min/avg/max/mdev = 0.131/0.173/0.192/0.026 ms
</screen>
			This proves that name resolution via the <filename>/etc/hosts</filename> file
			is working.
			</para></step>

			<step><para>
			<indexterm><primary>/etc/nsswitch.conf</primary></indexterm>
			So far, your installation is going particularly well. In this step we validate
			DNS server and name resolution operation. Using your favorite UNIX system editor,
			change the <filename>/etc/nsswitch.conf</filename> file so that the
			<constant>hosts</constant> entry reads:
<screen>
hosts:        dns
</screen>
			</para></step>

			<step><para>
			<indexterm><primary>named</primary></indexterm>
			Before you test DNS operation, it is a good idea to verify that the DNS server
			is running by executing the following:
<screen>
&rootprompt; ps ax | grep named
  437 ?        S      0:00 /sbin/syslogd -a /var/lib/named/dev/log
  524 ?        S      0:00 /usr/sbin/named -t /var/lib/named -u named
  525 ?        S      0:00 /usr/sbin/named -t /var/lib/named -u named
  526 ?        S      0:00 /usr/sbin/named -t /var/lib/named -u named
  529 ?        S      0:00 /usr/sbin/named -t /var/lib/named -u named
  540 ?        S      0:00 /usr/sbin/named -t /var/lib/named -u named
 2552 pts/2    S      0:00 grep named
</screen>
			This means that we are ready to check DNS operation. Do so by executing:
			<indexterm><primary>ping</primary></indexterm>
<screen>
&rootprompt; ping diamond
PING sleeth1.abmas.biz (192.168.1.1) 56(84) bytes of data.
64 bytes from sleeth1 (192.168.1.1): icmp_seq=1 ttl=64 time=0.156 ms
64 bytes from sleeth1 (192.168.1.1): icmp_seq=2 ttl=64 time=0.183 ms

--- sleeth1.abmas.biz ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.156/0.169/0.183/0.018 ms
</screen>
			You should take a few more steps to validate DNS server operation, as follows:
<screen>
&rootprompt; host -f diamond.abmas.biz
sleeth1.abmas.biz has address 192.168.1.1
</screen>
			<indexterm><primary>/etc/hosts</primary></indexterm>
			You may now remove the entry called <constant>diamond</constant> from the
			<filename>/etc/hosts</filename> file. It does not hurt to leave it there,
			but its removal reduces the number of administrative steps for this name.
			</para></step>

			<step><para>
			<indexterm><primary>/etc/nsswitch.conf</primary></indexterm>
			WINS is a great way to resolve NetBIOS names to their IP address. You can test
			the operation of WINS by starting <command>nmbd</command> (manually or by way
			of the Samba startup method shown in <link linkend="procstart"/>). You must edit
			the <filename>/etc/nsswitch.conf</filename> file so that the <constant>hosts</constant>
			entry is as follows:
<screen>
hosts:        wins
</screen>
			The next step is to make certain that Samba is running using <command>ps ax | grep mbd</command>.
			The <command>nmbd</command> daemon will provide the WINS name resolution service when the
			&smb.conf; file <smbconfsection>[global]</smbconfsection> parameter <smbconfoption name="wins
			support">Yes</smbconfoption> has been specified.  Having validated that Samba is operational,
			excute the following:
<screen>
&rootprompt; ping diamond
PING diamond (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.094 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.479 ms
</screen>
			<indexterm><primary>ping</primary></indexterm>
			Now that you can relax with the knowledge that all three major forms of name
			resolution to IP address resolution are working, edit the <filename>/etc/nsswitch.conf</filename>
			again. This time you add all three forms of name resolution to this file.
			Your edited entry for <constant>hosts</constant> should now look like this:
<screen>
hosts:       files dns wins
</screen>
			The system is looking good. Let's move on.
			</para></step>

			<step><para>
			It would give you peace of mind to know that the DHCP server is running
			and available for service. You can validate DHCP services by running:

<screen>
&rootprompt; ps ax | grep dhcp
 2618 ?        S      0:00 /usr/sbin/dhcpd ...
 8180 pts/2    S      0:00 grep dhcp
</screen>
			This shows that the server is running. The proof of whether or not it is working
			comes when you try to add the first DHCP client to the network.
			</para></step>

			<step><para>
			<indexterm><primary>testparm</primary></indexterm>
			This is a good point at which to start validating Samba operation. You are 
			content that name resolution is working for basic TCP/IP needs. Let's move on.
			If your &smb.conf; file has bogus options or parameters, this may cause Samba
			to refuse to start. The first step should always be to validate the contents
			of this file by running:
<screen>
&rootprompt; testparm -s
Load smb config files from smb.conf
Processing section "[homes]"
Processing section "[printers]"
Processing section "[netlogon]"
Processing section "[profiles]"
Processing section "[accounts]"
Processing section "[service]"
Processing section "[apps]"
Loaded services file OK.
# Global parameters
[global]
    workgroup = PROMISES
    netbios name = DIAMOND
    interfaces = eth1, eth2, lo
    bind interfaces only = Yes
    passdb backend = tdbsam
    pam password change = Yes
    passwd program = /usr/bin/passwd '%u'
    passwd chat = *New*Password* %n\n \
             *Re-enter*new*password* %n\n *Password*changed*
    username map = /etc/samba/smbusers
    unix password sync = Yes
    log level = 1
    syslog = 0
    log file = /var/log/samba/%m
    max log size = 50
    smb ports = 139
    name resolve order = wins bcast hosts
    time server = Yes
    printcap name = CUPS
    show add printer wizard = No
    add user script = /usr/sbin/useradd -m '%u'
    delete user script = /usr/sbin/userdel -r '%u'
    add group script = /usr/sbin/groupadd '%g'
    delete group script = /usr/sbin/groupdel '%g'
    add user to group script = /usr/sbin/usermod -G '%g' '%u'
    add machine script = /usr/sbin/useradd \
                              -s /bin/false -d /dev/null '%u'
    shutdown script = /var/lib/samba/scripts/shutdown.sh
    abort shutdown script = /sbin/shutdown -c
    logon script = scripts\logon.bat
    logon path = \\%L\profiles\%U
    logon drive = X:
    logon home = \\%L\%U
    domain logons = Yes
    preferred master = Yes
    wins support = Yes
    utmp = Yes
    winbind use default domain = Yes
    map acl inherit = Yes
    cups options = Raw
    veto files = /*.eml/*.nws/*.{*}/
    veto oplock files = /*.doc/*.xls/*.mdb/

[homes]
    comment = Home Directories
    valid users = %S
    read only = No
    browseable = No
...
### Remainder cut to save space ###
</screen>
			Clear away all errors before proceeding.
			</para></step>

			<step><para>
			<indexterm><primary>check samba daemons</primary></indexterm>
			<indexterm><primary>smbd</primary></indexterm>
			<indexterm><primary>nmbd</primary></indexterm>
			<indexterm><primary>winbindd</primary></indexterm>
			Check that the Samba server is running:
<screen>
&rootprompt; ps ax | grep mbd
14244 ?        S      0:00 /usr/sbin/nmbd -D
14245 ?        S      0:00 /usr/sbin/nmbd -D
14290 ?        S      0:00 /usr/sbin/smbd -D

$rootprompt; ps ax | grep winbind
14293 ?        S     0:00 /usr/sbin/winbindd -D
14295 ?        S     0:00 /usr/sbin/winbindd -D
</screen>
			The <command>winbindd</command> daemon is running in split mode (normal), so there are also
			two instances<footnote><para>For more information regarding winbindd, see <emphasis>TOSHARG2</emphasis>, 
			Chapter 23, Section 23.3. The single instance of <command>smbd</command> is normal. One additional
			<command>smbd</command> slave process is spawned for each SMB/CIFS client 
			connection.</para></footnote> of it.
			</para></step>
	
			<step><para>
			<indexterm><primary>anonymous
		  connection</primary></indexterm>
	      <indexterm>
		<primary>smbclient</primary>
	      </indexterm>
			Check that an anonymous connection can be made to the Samba server:
<screen>
&rootprompt; smbclient -L localhost -U%

        Sharename      Type      Comment
        ---------      ----      -------
        IPC$           IPC       IPC Service (Samba 3.0.20)
        netlogon       Disk      Network Logon Service
        profiles       Disk      Profile Share
        accounts       Disk      Accounting Files
        service        Disk      Financial Services Files
        apps           Disk      Application Files
        ADMIN$         IPC       IPC Service (Samba 3.0.20)
        hplj6a         Printer   hplj6a
        hplj6f         Printer   hplj6f
        qmsa           Printer   qmsa
        qmsf           Printer   qmsf

        Server               Comment
        ---------            -------
        DIAMOND              Samba 3.0.20

        Workgroup            Master
        ---------            -------
        PROMISES             DIAMOND
</screen>
			This demonstrates that an anonymous listing of shares can be obtained. This is the equivalent
			of browsing the server from a Windows client to obtain a list of shares on the server.
			The <constant>-U%</constant> argument means to send a <constant>NULL</constant> username and
			a <constant>NULL</constant> password.
			</para></step>

			<step><para>
			<indexterm><primary>dhcp client validation</primary></indexterm>
			<indexterm><primary>printer validation</primary></indexterm>
			<indexterm><primary>arp</primary></indexterm>
			Verify that each printer has the IP address assigned in the DHCP server configuration file.
			The easiest way to do this is to ping the printer name. Immediately after the ping response
			has been received, execute <command>arp -a</command> to find the MAC address of the printer
			that has responded. Now you can compare the IP address and the MAC address of the printer
			with the configuration information in the <filename>/etc/dhcpd.conf</filename> file. They
			should, of course, match. For example,
<screen>
&rootprompt; ping hplj6
PING hplj6a (192.168.1.30) 56(84) bytes of data.
64 bytes from hplj6a (192.168.1.30): icmp_seq=1 ttl=64 time=0.113 ms

&rootprompt; arp -a
hplj6a (192.168.1.30) at 00:03:47:CB:81:E0 [ether] on eth0
</screen>
	      <indexterm>
		<primary>/etc/dhcpd.conf</primary>
	      </indexterm>
			The MAC address <constant>00:03:47:CB:81:E0</constant> matches that specified for the
			IP address from which the printer has responded and with the entry for it in the
			<filename>/etc/dhcpd.conf</filename> file. Repeat this for each printer configured.
			</para></step>
	
			<step><para>
			<indexterm><primary>authenticated connection</primary></indexterm>
			Make an authenticated connection to the server using the <command>smbclient</command> tool:
<screen>
&rootprompt; smbclient //diamond/accounts -U gholmes
Password: XXXXXXX
smb: \> dir
  .                          D        0  Thu Nov 27 15:07:09 2003
  ..                         D        0  Sat Nov 15 17:40:50 2003
  zakadmin.exe                   161424  Thu Nov 27 15:06:52 2003
  zak.exe                       6066384  Thu Nov 27 15:06:52 2003
  dhcpd.conf                       1256  Thu Nov 27 15:06:52 2003
  smb.conf                         2131  Thu Nov 27 15:06:52 2003
  initGrps.sh                A     1089  Thu Nov 27 15:06:52 2003
  POLICY.EXE                      86542  Thu Nov 27 15:06:52 2003

                55974 blocks of size 65536. 33968 blocks available
smb: \> q
</screen>
			</para></step>

			<step><para>
			<indexterm><primary>nmap</primary></indexterm>
			Your new server is connected to an Internet-accessible connection. Before you start
			your firewall, you should run a port scanner against your system. You should repeat that
			after the firewall has been started. This helps you understand to what extent the
			server may be vulnerable to external attack. One way you can do this is by using an
			external service, such as the <ulink url="http://www.dslreports.com/scan">DSL Reports</ulink> 
			tools. Alternately, if you can gain root-level access to a remote
			UNIX/Linux system that has the <command>nmap</command> tool, you can run the following:
<screen>
&rootprompt; nmap -v -sT server.abmas.us

Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
Host server.abmas.us (123.45.67.66) appears to be up ... good.
Initiating Connect() Scan against server.abmas.us (123.45.67.66)
Adding open port 6000/tcp
Adding open port 873/tcp
Adding open port 445/tcp
Adding open port 10000/tcp
Adding open port 901/tcp
Adding open port 631/tcp
Adding open port 25/tcp
Adding open port 111/tcp
Adding open port 32770/tcp
Adding open port 3128/tcp
Adding open port 53/tcp
Adding open port 80/tcp
Adding open port 443/tcp
Adding open port 139/tcp
Adding open port 22/tcp
The Connect() Scan took 0 seconds to scan 1601 ports.
Interesting ports on server.abmas.us (123.45.67.66):
(The 1587 ports scanned but not shown below are in state: closed)
Port       State       Service
22/tcp     open        ssh
25/tcp     open        smtp
53/tcp     open        domain
80/tcp     open        http
111/tcp    open        sunrpc
139/tcp    open        netbios-ssn
443/tcp    open        https
445/tcp    open        microsoft-ds
631/tcp    open        ipp
873/tcp    open        rsync
901/tcp    open        samba-swat
3128/tcp   open        squid-http
6000/tcp   open        X11
10000/tcp  open        snet-sensor-mgmt
32770/tcp  open        sometimes-rpc3

Nmap run completed -- 1 IP address (1 host up) scanned in 1 second
</screen>
			The above scan was run before the external interface was locked down with the NAT-firewall
			script you created above. The following results are obtained after the firewall rules
			have been put into place:
<screen>
&rootprompt; nmap -v -sT server.abmas.us

Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
Host server.abmas.us (123.45.67.66) appears to be up ... good.
Initiating Connect() Scan against server.abmas.us (123.45.67.66)
Adding open port 53/tcp
Adding open port 22/tcp
The Connect() Scan took 168 seconds to scan 1601 ports.
Interesting ports on server.abmas.us (123.45.67.66):
(The 1593 ports scanned but not shown below are in state: filtered)
Port       State       Service
22/tcp     open        ssh
25/tcp     closed      smtp
53/tcp     open        domain
80/tcp     closed      http
443/tcp    closed      https

Nmap run completed -- 1 IP address (1 host up) scanned in 168 seconds
</screen>
			</para></step>
	
		</procedure>

	</sect2>

	<sect2 id="ch4appscfg">
	<title>Application Share Configuration</title>

	<para>
	<indexterm><primary>application server</primary></indexterm>
	<indexterm><primary>administrative installation</primary></indexterm>
	The use of an application server is a key mechanism by which desktop administration overheads
	can be reduced. Check the application manual for your software to identify how best to
	create an administrative installation.
	</para>

	<para>
	Some Windows software will only run locally on the desktop computer. Such software
	is typically not suited for administrative installation. Administratively installed software
	permits one or more of the following installation choices:
	</para>

	<itemizedlist>
		<listitem><para>
		Install software fully onto a workstation, storing data files on the same workstation.
		</para></listitem>

		<listitem><para>
		Install software fully onto a workstation with central network data file storage.
		</para></listitem>

		<listitem><para>
		Install software to run off a central application server with data files stored
		on the local workstation. This is often called a minimum installation, or a
		network client installation.
		</para></listitem>

		<listitem><para>
		Install software to run off a central application server with data files stored
		on a central network share. This type of installation often prevents storage
		of work files on the local workstation.
		</para></listitem>
	</itemizedlist>

	<para>
	<indexterm><primary></primary></indexterm>
	A common application deployed in this environment is an office suite.
	Enterprise editions of Microsoft Office XP Professional can be administratively installed
	by launching the installation from a command shell. The command that achieves this is
	<command>setup /a</command>. It results in a set of prompts through which various
	installation choices can be made. Refer to the Microsoft Office Resource SDK and Resource
	Kit for more information regarding this mode of installation of MS Office XP Professional.
	The full administrative installation of MS Office XP Professional requires approximately
	650 MB of disk space.
	</para>

	<para>
	When the MS Office XP Professional product has been installed to the administrative network
	share, the product can be installed onto a workstation by executing the normal setup program.
	The installation process now provides a choice to either perform a minimum installation
	or a full local installation. A full local installation takes over 100 MB of disk space.
	A network workstation (minimum) installation requires typically 10 MB to 15 MB of
	local disk space. In the latter case, when the applications are used, they load over the network.
	</para>

	<para>
	<indexterm><primary>Service Packs</primary></indexterm>
	<indexterm><primary>Microsoft Office</primary></indexterm>
	Microsoft Office Service Packs can be unpacked to update an administrative share. This makes
	it possible to update MS Office XP Professional for all users from a single installation
	of the service pack and generally circumvents the need to run updates on each network
	Windows client.
	</para>	

	<para>
	The default location for MS Office XP Professional data files can be set through registry
	editing or by way of configuration options inside each Office XP Professional application.
	</para>

	<para>
	<indexterm><primary>OpenOffice</primary></indexterm>
	OpenOffice.Org OpenOffice Version 1.1.0 can be installed locally. It can also
	be installed to run off a network share. The latter is a most desirable solution for office-bound 
	network users and for administrative staff alike. It permits quick and easy updates
	to be rolled out to all users with a minimum of disruption and with maximum flexibility.
	</para>

	<para>
	The process for installation of administrative shared OpenOffice involves download of the
	distribution ZIP file, followed by extraction of the ZIP file into a temporary disk area.
	When fully extracted using the unzipping tool of your choosing, change into the Windows
	installation files directory then execute <command>setup -net</command>. You are
	prompted on screen for the target installation location. This is the administrative
	share point. The full administrative OpenOffice share takes approximately 150 MB of disk
	space.
	</para>

		<sect3>
		<title>Comments Regarding Software Terms of Use</title>
			<para>
			Many single-user products can be installed into an administrative share, but
			personal versions of products such as Microsoft Office XP Professional do not permit this. 
			Many people do not like terms of use typical with commercial products, so a few comments
			regarding software licensing seem important.
			</para>

			<para>
			Please do not use an administrative installation of proprietary and commercially licensed 
			software products to violate the copyright holders' property. All software is licensed,
			particularly software that is licensed for use free of charge. All software is the property
			of the copyright holder unless the author and/or copyright holder has explicitly disavowed
			ownership and has placed the software into the public domain.
			</para>

			<para>
			Software that is under the GNU General Public License, like proprietary software, is 
			licensed in a way that restricts use. For example, if you modify GPL software and then
			distribute the binary version of your modifications, you must offer to provide the source
			code as well. This restriction is designed to maintain the momentum
			of the diffusion of technology and to protect against the withholding of innovations.
			</para>

			<para>
			Commercial and proprietary software generally restrict use to those who have paid the
			license fees and who comply with the licensee's terms of use. Software that is released
			under the GNU General Public License is restricted to particular terms and conditions
			also. Whatever the licensing terms may be, if you do not approve of the terms of use,
			please do not use the software.
			</para>

			<para>
			<indexterm><primary>GPL</primary></indexterm>
			Samba is provided under the terms of the GNU GPL Version 2, a copy of which is provided
			with the source code.
			</para>
		</sect3>

	</sect2>

	<sect2 id="ch4wincfg">
	<title>Windows Client Configuration</title>

	<para>
	Christine needs to roll out 130 new desktop systems. There is no doubt that she also needs
	to reinstall many of the notebook computers that will be recycled for use with the new network 
	configuration. The smartest way to handle the challenge of the roll-out program is to build
	a staged system for each type of target machine, and then use an image replication tool such as Norton
	Ghost (enterprise edition) to replicate the staged machine to its target desktops. The same can
	be done with notebook computers as long as they are identical or sufficiently similar.
	</para>

	<procedure id="sbewinclntprep">
	<title>Windows Client Configuration Procedure</title>

		<step><para>
		<indexterm><primary>WINS</primary></indexterm>
		<indexterm><primary>DHCP</primary></indexterm>
		Install MS Windows XP Professional. During installation, configure the client to use DHCP for 
		TCP/IP protocol configuration. DHCP configures all Windows clients to use the WINS Server
		address that has been defined for the local subnet.
		</para></step>

		<step><para>
		Join the Windows Domain <constant>PROMISES</constant>. Use the Domain Administrator
		username <constant>root</constant> and the SMB password you assigned to this account.
		A detailed step-by-step procedure for joining a Windows 200x/XP Professional client to
		a Windows Domain is given in <link linkend="appendix"/>, <link linkend="domjoin"/>. 
		Reboot the machine as prompted and then log on using the Domain Administrator account
		(<constant>root</constant>).
		</para></step>

		<step><para>
		Verify <constant>DIAMOND</constant> is visible in <guimenu>My Network Places</guimenu>, 
		that it is possible to connect to it and see the shares <guimenuitem>accounts</guimenuitem>,
		<guimenuitem>apps</guimenuitem>, and <guimenuitem>finsvcs</guimenuitem>, and that it is
		possible to open each share to reveal its contents.
		</para></step>

		<step><para>
		Create a drive mapping to the <constant>apps</constant> share on the server <constant>DIAMOND</constant>.
		</para></step>

		<step><para>
		Perform an administrative installation of each application to be used. Select the options
		that you wish to use. Of course, you can choose to run applications over the network, correct?
		</para></step>

		<step><para>
		Now install all applications to be installed locally. Typical tools include Adobe Acrobat,
		NTP-based time synchronization software, drivers for specific local devices such as fingerprint
		scanners, and the like. Probably the most significant application for local installation
		is antivirus software.
		</para></step>

		<step><para>
		Now install all four printers onto the staging system. The printers you install
		include the accounting department HP LaserJet 6 and Minolta QMS Magicolor printers. You will
		also configure identical printers that are located in the financial services department.
		Install printers on each machine following the steps shown in the Windows client printer
		preparation procedure below.
		</para></step>

		<step><para>
		<indexterm><primary>defragmentation</primary></indexterm>
		When you are satisfied that the staging systems are complete, use the appropriate procedure to
		remove the client from the domain. Reboot the system and then log on as the local administrator
		and clean out all temporary files stored on the system. Before shutting down, use the disk
		defragmentation tool so that the file system is in optimal condition before replication.
		</para></step>

		<step><para>
		Boot the workstation using the Norton (Symantec) Ghosting diskette (or CD-ROM) and image the
		machine to a network share on the server.
		</para></step>

		<step><para>
		<indexterm><primary>Windows security identifier</primary><see>SID</see></indexterm>
		<indexterm><primary>SID</primary></indexterm>
		You may now replicate the image to the target machines using the appropriate Norton Ghost 
		procedure. Make sure to use the procedure that ensures each machine has a unique
		Windows security identifier (SID). When the installation of the disk image has completed, boot the PC. 
		</para></step>

		<step><para>
		Log on to the machine as the local Administrator (the only option), and join the machine to
		the Domain, following the procedure set out in <link linkend="appendix"/>, <link linkend="domjoin"/>. The system is now 
		ready for the user to log on, provided you have created a network logon account for that 
		user, of course.
		</para></step>

		<step><para>
		Instruct all users to log on to the workstation using their assigned username and password.
		</para></step>
	</procedure>

	<procedure id="sbewinclntptrprep">
	<title>Windows Client Printer Preparation Procedure</title>

		<step><para>
		Click <menuchoice>
			<guimenu>Start</guimenu>
			<guimenuitem>Settings</guimenuitem>
			<guimenuitem>Printers</guimenuitem>
			<guiicon>Add Printer</guiicon>
			<guibutton>Next</guibutton>
			</menuchoice>. Do not click <guimenuitem>Network printer</guimenuitem>.
			Ensure that <guimenuitem>Local printer</guimenuitem> is selected.
		</para></step>

		<step><para>
		Click <guibutton>Next</guibutton>. In the
		<guimenuitem>Manufacturer:</guimenuitem> panel, select <constant>HP</constant>.
		In the <guimenuitem>Printers:</guimenuitem> panel, select the printer called
		<constant>HP LaserJet 6</constant>. Click <guibutton>Next</guibutton>.
		</para></step>

		<step><para>
		In the <guimenuitem>Available ports:</guimenuitem> panel, select
		<constant>FILE:</constant>. Accept the default printer name by clicking
		<guibutton>Next</guibutton>. When asked, <quote>Would you like to print a
		test page?,</quote> click <guimenuitem>No</guimenuitem>. Click
		<guibutton>Finish</guibutton>.
		</para></step>

		<step><para>
		You may be prompted for the name of a file to print to. If so, close the
		dialog panel. Right-click <menuchoice>
			<guiicon>HP LaserJet 6</guiicon>
			<guimenuitem>Properties</guimenuitem>
			<guisubmenu>Details (Tab)</guisubmenu>
			<guimenuitem>Add Port</guimenuitem>
			</menuchoice>.
		</para></step>

		<step><para>
		In the <guimenuitem>Network</guimenuitem> panel, enter the name of
		the print queue on the Samba server as follows: <constant>\\DIAMOND\hplj6a</constant>.
		Click <menuchoice> 
			<guibutton>OK</guibutton>
			<guibutton>OK</guibutton>
			</menuchoice> to complete the installation.
		</para></step>

		<step><para>
		Repeat the printer installation steps above for both HP LaserJet 6 printers
		as well as for both QMS Magicolor laser printers.
		</para></step>
	</procedure>

	</sect2>

	<sect2>
	<title>Key Points Learned</title>

		<para>
		How do you feel? You have built a capable network, a truly ambitious project.
		Future network updates can be handled by
		your staff. You must be a satisfied manager. Let's review the achievements.
		</para>

		<itemizedlist>
			<listitem><para>
			A simple firewall has been configured to protect the server in the event that
			the ISP firewall service should fail.
			</para></listitem>

			<listitem><para>
			The Samba configuration uses measures to ensure that only local network users
			can connect to SMB/CIFS services.
			</para></listitem>

			<listitem><para>
			Samba uses the new <constant>tdbsam</constant> passdb backend facility.
			Considerable complexity was added to Samba functionality.
			</para></listitem>

			<listitem><para>
			A DHCP server was configured to implement dynamic DNS (DDNS) updates to the DNS
			server.
			</para></listitem>

			<listitem><para>
			The DNS server was configured to permit DDNS only for local network clients. This
			server also provides primary DNS services for the company Internet presence.
			</para></listitem>

			<listitem><para>
			You introduced an application server as well as the concept of cloning a Windows
			client in order to effect improved standardization of desktops and to reduce
			the costs of network management.
			</para></listitem>
		</itemizedlist>

	</sect2>

</sect1>

<sect1>
	<title>Questions and Answers</title>

	<para>
	</para>

	<qandaset defaultlable="missed01" type="number">
	<qandaentry>
	<question>

		<para>
		What is the maximum number of account entries that the <parameter>tdbsam</parameter>
		passdb backend can handle?
		</para>

	</question>
	<answer>

		<para>
		The tdb data structure and support system can handle more entries than the number of
		accounts that are possible on most UNIX systems. A practical limit would come into
		play long before a performance boundary would be anticipated. That practical limit
		is controlled by the nature of Windows networking. There are few Windows file and
		print servers that can handle more than a few hundred concurrent client connections.
		The key limiting factors that predicate offloading of services to additional servers
		are memory capacity, the number of CPUs, network bandwidth, and disk I/O limitations.
		All of these are readily exhausted by just a few hundred concurrent active users.
		Such bottlenecks can best be removed by segmentation of the network (distributing
		network load across multiple networks).
		</para>

		<para>
		As the network grows, it becomes necessary to provide additional authentication
		servers (domain controllers).  The tdbsam is limited to a single machine and cannot
		be reliably replicated.  This means that practical limits on network design dictate
		the point at which a distributed passdb backend is required; at this time, there is
		no real alternative other than ldapsam (LDAP).
		</para>

		<para>
		The guideline provided in <emphasis>TOSHARG2</emphasis>, Chapter 10, Section 10.1.2,
		is to limit the number of accounts in the tdbsam backend to 250. This is the point
		at which most networks tend to want backup domain controllers (BDCs). Samba-3 does
		not provide a mechanism for replicating tdbsam data so it can be used by a BDC. The
		limitation of 250 users per tdbsam is predicated only on the need for replication,
		not on the limits<footnote><para>Bench tests have shown that tdbsam is a very
		effective database technology.  There is surprisingly little performance loss even
		with over 4000 users.</para></footnote> of the tdbsam backend itself. 
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		Would Samba operate any better if the OS level is set to a value higher than 35?
		</para>

	</question>
	<answer>

		<para>
		No. MS Windows workstations and servers do not use a value higher than 33. Setting this to a value
		of 35 already assures Samba of precedence over MS Windows products in browser elections. There is
		no gain to be had from setting this higher.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		Why in this example have you provided UNIX group to Windows Group mappings for only Domain Groups?
		</para>

	</question>
	<answer>

		<para>
		At this time, Samba has the capacity to use only Domain Groups mappings. It is possible that at
		a later date Samba may make use of Windows Local Groups, as well as of the Active Directory special
		Groups. Proper operation requires Domain Groups to be mapped to valid UNIX groups.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		Why has a path been specified in the <parameter>IPC$</parameter> share?
		</para>

	</question>
	<answer>

		<para>
		This is done so that in the event that a software bug may permit a client connection to the IPC$ share to
		obtain access to the file system, it does so at a location that presents least risk. Under normal operation
		this type of paranoid step should not be necessary. The use of this parameter should not be necessary. 
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		Why does the &smb.conf; file in this exercise include an entry for <smbconfoption name="smb ports"/>?
		</para>

	</question>
	<answer>

		<para>
		The default order by which Samba-3 attempts to communicate with MS Windows clients is via port 445 (the TCP port
		used by Windows clients when NetBIOS-less SMB over TCP/IP is in use). TCP port 139 is the primary port used for NetBIOS
		over TCP/IP. In this configuration Windows network operations are predicated around NetBIOS over TCP/IP. By
		specifying the use of only port 139, the intent is to reduce unsuccessful service connection attempts.
		The result of this is improved network performance. Where Samba-3 is installed as an Active Directory Domain
		member, the default behavior is highly beneficial and should not be changed.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		What is the difference between a print queue and a printer?
		</para>

	</question>
	<answer>

		<para>
		A printer is a physical device that is connected either directly to the network or to a computer 
		via a serial, parallel, or USB connection so that print jobs can be submitted to it to create a 
		hard copy printout. Network-attached printers that use TCP/IP-based printing generally accept a 
		single print data stream and block all secondary attempts to dispatch jobs concurrently to the 
		same device. If many clients were to concurrently print directly via TCP/IP to the same printer, 
		it would result in a huge amount of network traffic through continually failing connection attempts.
		</para>

		<para>
		A print server (like CUPS or LPR/LPD) accepts multiple concurrent input streams or
		print requests. When the data stream has been fully received, the input stream is closed,
		and the job is then submitted to a sequential print queue where the job is stored until
		the printer is ready to receive the job.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		Can all MS Windows application software be installed onto an application server share?
		</para>

	</question>
	<answer>

		<para>
		Much older Windows software is not compatible with installation to and execution from
		an application server. Enterprise versions of Microsoft Office XP Professional can
		be installed to an application server. Retail consumer versions of Microsoft Office XP
		Professional do not permit installation to an application server share and can be installed
		and used only to/from a local workstation hard disk.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		Why use dynamic DNS (DDNS)?
		</para>

	</question>
	<answer>

		<para>
		When DDNS records are updated directly from the DHCP server, it is possible for
		network clients that are not NetBIOS-enabled, and thus cannot use WINS, to locate
		Windows clients via DNS.
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		Why would you use WINS as well as DNS-based name resolution?
		</para>

	</question>
	<answer>

		<para>
		WINS is to NetBIOS names as DNS is to fully qualified domain names (FQDN). The FQDN is
		a name like <quote>myhost.mydomain.tld</quote> where <parameter>tld</parameter>
		means <constant>top-level domain</constant>. A FQDN is a longhand but easy-to-remember
		expression that may be up to 1024 characters in length and that represents an IP address. 
		A NetBIOS name is always 16 characters long. The 16<superscript>th</superscript> character
		is a name type indicator. A specific name type is registered<footnote><para>
		See <emphasis>TOSHARG2</emphasis>, Chapter 9, for more information.</para></footnote> for each 
		type of service that is provided by the Windows server or client and that may be registered
		where a WINS server is in use.
		</para>

		<para>
		WINS is a mechanism by which a client may locate the IP Address that corresponds to a
		NetBIOS name. The WINS server may be queried to obtain the IP Address for a NetBIOS name 
		that includes a particular registered NetBIOS name type. DNS does not provide a mechanism
		that permits handling of the NetBIOS name type information.
		</para>

		<para>
		DNS provides a mechanism by which TCP/IP clients may locate the IP address of a particular 
		hostname or service name that has been registered in the DNS database for a particular domain. 
		A DNS server has limited scope of control and is said to be authoritative for the zone over
		which it has control.
		</para>

		<para>
		Windows 200x Active Directory requires the registration in the DNS zone for the domain it 
		controls of service locator<footnote><para>See TOSHARG2, Chapter 9, Section 9.3.3.</para></footnote> records 
		that Windows clients and servers will use to locate Kerberos and LDAP services. ADS also 
		requires the registration of special records that are called global catalog (GC) entries 
		and site entries by which domain controllers and other essential ADS servers may be located. 
		</para>

	</answer>
	</qandaentry>

	<qandaentry>
	<question>

		<para>
		What are the major benefits of using an application server?
		</para>

	</question>
	<answer>

		<para>
		The use of an application server can significantly reduce application update maintenance.
		By providing a centralized application share, software updates need be applied to only
		one location for all major applications used. This results in faster update roll-outs and
		significantly better application usage control.
		</para>

	</answer>
	</qandaentry>

	</qandaset>

</sect1>

</chapter>