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diff --git a/docs/howto/Problems.xml b/docs/howto/Problems.xml new file mode 100644 index 0000000000..01879599bd --- /dev/null +++ b/docs/howto/Problems.xml @@ -0,0 +1,293 @@ +<chapter id="problems"> + +<chapterinfo> + &author.jerry; + &author.jelmer; + &author.dbannon; + &author.danshearer; + <pubdate>8 Apr 2003</pubdate> +</chapterinfo> + +<title>Analyzing and Solving Samba Problems</title> + +<para> +There are many sources of information available in the form +of mailing lists, RFCs and documentation. The documentation that comes +with the Samba distribution contains good explanations of +general SMB topics such as browsing.</para> + +<sect1> +<title>Diagnostics Tools</title> + +<para>With SMB networking, it is often not immediately clear what +the cause is of a certain problem. Samba itself provides rather +useful information, but in some cases you might have to fall back +to using a <emphasis>sniffer</emphasis>. A sniffer is a program that +listens on your LAN, analyzes the data sent on it and displays it +on the screen.</para> + +<sect2> +<title>Debugging with Samba Itself</title> + +<para> +One of the best diagnostic tools for debugging problems is Samba itself. +You can use the <option>-d option</option> for both &smbd; and &nmbd; to specify the +<smbconfoption><name>debug level</name></smbconfoption> at which to run. +See the man pages for <command>smbd, nmbd</command> and +&smb.conf; for more information regarding debugging options. The debug +level can range from 1 (the default) to 10 (100 for debugging passwords). +</para> + +<para> +Another helpful method of debugging is to compile Samba using the +<command>gcc -g </command> flag. This will include debug information in the binaries and +allow you to attach gdb to the running <command>smbd/nmbd</command> process. +To attach <command>gdb</command> to an <command>smbd</command> +process for an NT workstation, first get the workstation to make the +connection. Pressing ctrl-alt-delete and going down to the domain box +is sufficient (at least, the first time you join the domain) to +generate a <parameter>LsaEnumTrustedDomains</parameter>. Thereafter, the workstation +maintains an open connection and there will be an smbd +process running (assuming that you haven't set a really short smbd +idle timeout). So, in between pressing <command>ctrl-alt-delete</command> and actually +typing in your password, you can attach <command>gdb</command> and continue. +</para> + +<para> +Some useful Samba commands worth investigating are: +</para> + +<screen> +&prompt;<userinput>testparm | more</userinput> +&prompt;<userinput>smbclient -L //{netbios name of server}</userinput> +</screen> + +</sect2> + +<sect2> + <title>Tcpdump</title> + +<para> +<ulink url="http://www.tcpdump.org/">Tcpdump</ulink> was the first +UNIX sniffer with SMB support. It is a command-line utility and +now, its SMB support is somewhat lagging that of <command>ethereal</command> +and <command>tethereal</command>. +</para> + +</sect2> + +<sect2> + <title>Ethereal</title> + +<para> +<ulink url="http://www.ethereal.com/">Ethereal</ulink> is a graphical +sniffer, available for both UNIX (Gtk) and Windows. Ethereal's +SMB support is quite good.</para> + +<para>For details on the use of <command>ethereal</command>, read the well-written +Ethereal User Guide.</para> + +<image id="ethereal1"><imagefile>ethereal1</imagefile><imagedescription>Starting a capture.</imagedescription></image> + +<para>Listen for data on ports 137, 138, 139, and 445. For example, use +the filter <userinput>port 137, port 138, port 139, or port +445</userinput> as seen in <link linkend="ethereal1">Starting a capture</link> snapshot.</para> + +<para>A console version of ethereal is available as well and is called +<command>tethereal</command>.</para> + +<image id="ethereal2"><imagefile>ethereal2</imagefile><imagedescription>Main ethereal data window.</imagedescription></image> + +</sect2> + +<sect2> +<title>The Windows Network Monitor</title> + +<para> +For tracing things on Microsoft Windows NT, Network Monitor +(aka Netmon) is available on Microsoft Developer Network CDs, +the Windows NT Server install CD and the SMS CDs. The version of +Netmon that ships with SMS allows for dumping packets between any two +computers (i.e., placing the network interface in promiscuous mode). +The version on the NT Server install CD will only allow monitoring +of network traffic directed to the local NT box and broadcasts on the +local subnet. Be aware that Ethereal can read and write Netmon +formatted files. +</para> + +<sect3> +<title>Installing Network Monitor on an NT Workstation</title> + +<para> +Installing Netmon on an NT workstation requires a couple +of steps. The following are instructions for installing Netmon V4.00.349, which comes +with Microsoft Windows NT Server 4.0, on Microsoft Windows NT +Workstation 4.0. The process should be similar for other versions of +Windows NT version of Netmon. You will need both the Microsoft Windows +NT Server 4.0 Install CD and the Workstation 4.0 Install CD. +</para> + +<para> +Initially you will need to install <application>Network Monitor Tools and Agent</application> +on the NT Server to do this: +</para> + +<itemizedlist> + <listitem><para>Go to <guibutton>Start</guibutton> -> <guibutton>Settings</guibutton> -> <guibutton>Control Panel</guibutton> -> + <guibutton>Network</guibutton> -> <guibutton>Services</guibutton> -> <guibutton>Add</guibutton>.</para></listitem> + + <listitem><para>Select the <guilabel>Network Monitor Tools and Agent</guilabel> and click on <guibutton>OK</guibutton>.</para></listitem> + + <listitem><para>Click on <guibutton>OK</guibutton> on the Network Control Panel.</para></listitem> + + <listitem><para>Insert the Windows NT Server 4.0 install CD when prompted.</para></listitem> +</itemizedlist> + +<para> +At this point, the Netmon files should exist in <filename>%SYSTEMROOT%\System32\netmon\*.*</filename>. +Two subdirectories exist as well, <filename>parsers\</filename> which contains the necessary DLLs +for parsing the Netmon packet dump, and <filename>captures\</filename>. +</para> + +<para> +To install the Netmon tools on an NT Workstation, you will first need to install the +Network Monitor Agent from the Workstation install CD. +</para> + +<itemizedlist> + <listitem><para>Go to <guibutton>Start</guibutton> -> <guibutton>Settings</guibutton> -> <guibutton>Control Panel</guibutton> -> + <guibutton>Network</guibutton> -> <guibutton>Services</guibutton> -> <guibutton>Add</guibutton>.</para></listitem> + + <listitem><para>Select the <guilabel>Network Monitor Agent</guilabel>, click on <guibutton>OK</guibutton>.</para></listitem> + + <listitem><para>Click on <guibutton>OK</guibutton> in the Network Control Panel. + </para></listitem> + + <listitem><para>Insert the Windows NT Workstation 4.0 install CD when prompted.</para></listitem> +</itemizedlist> + +<para> +Now copy the files from the NT Server in <filename>%SYSTEMROOT%\System32\netmon</filename> +to <filename>%SYSTEMROOT%\System32\netmon</filename> on the Workstation and set permissions +as you deem appropriate for your site. You will need administrative rights on the NT box to run Netmon. +</para> + +</sect3> +<sect3> +<title>Installing Network Monitor on Windows 9x/Me</title> +<para> +To install Netmon on Windows 9x/Me, install the Network Monitor Agent +from the Windows 9x/Me CD (<filename>\admin\nettools\netmon</filename>). +There is a readme file located with the Netmon driver files on the CD if you need +information on how to do this. Copy the files from a working Netmon installation. +</para> +</sect3> +</sect2> +</sect1> + +<sect1> +<title>Useful URLs</title> +<itemizedlist> + +<listitem><para>See how Scott Merrill simulates a BDC behavior at + <ulink noescape="1" url="http://www.skippy.net/linux/smb-howto.html"> + http://www.skippy.net/linux/smb-howto.html</ulink>. </para></listitem> + +<listitem><para>FTP site for older SMB specs: + <ulink noescape="1" url="ftp://ftp.microsoft.com/developr/drg/CIFS/"> + ftp://ftp.microsoft.com/developr/drg/CIFS/</ulink></para></listitem> + +</itemizedlist> + +</sect1> + +<sect1> +<title>Getting Mailing List Help</title> + +<para> +There are a number of Samba-related mailing lists. Go to <ulink +noescape="1" url="http://samba.org">http://samba.org</ulink>, click on your nearest mirror +and then click on <command>Support</command> and next click on <command> +Samba-related mailing lists</command>. +</para> + +<para> +For questions relating to Samba TNG, go to +<ulink noescape="1" url="http://www.samba-tng.org/">http://www.samba-tng.org/.</ulink> +It has been requested that you do not post questions about Samba-TNG to the +main-stream Samba lists.</para> + +<para> +If you do post a message to one of the lists, please observe the following guidelines : +</para> + +<itemizedlist> + + <listitem><para>Always remember that the developers are volunteers, they are + not paid and they never guarantee to produce a particular feature at + a particular time. Any timelines are <quote>best guess</quote> and nothing more. + </para></listitem> + + <listitem><para>Always mention what version of Samba you are using and what + operating system it's running under. You should list the relevant sections of + your &smb.conf; file, at least the options in <smbconfsection>[global]</smbconfsection> + that affect PDC support. + </para></listitem> + + <listitem><para>In addition to the version, if you obtained Samba via + CVS, mention the date when you last checked it out.</para></listitem> + + <listitem><para> Try and make your questions clear and brief. Lots of long, + convoluted questions get deleted before they are completely read! + Do not post HTML encoded messages. Most people on mailing lists simply delete + them. + </para></listitem> + + <listitem><para> If you run one of those nifty <quote>I'm on holidays</quote> things when + you are away, make sure its configured to not answer mailing list traffic. Auto-responses + to mailing lists really irritate the thousands of people who end up having to deal + with such bad netiquet bahavior. + </para></listitem> + + <listitem><para>Don't cross post. Work out which is the best list to post to + and see what happens. Do not post to both samba-ntdom and samba-technical. + Many people active on the lists subscribe to more + than one list and get annoyed to see the same message two or more times. + Often someone will see a message and thinking it would be better dealt + with on another list, will forward it on for you.</para></listitem> + + <listitem><para>You might include <emphasis>partial</emphasis> + log files written at a debug level set to as much as 20. + Please do not send the entire log but just enough to give the context of the + error messages.</para></listitem> + + <listitem><para>If you have a complete Netmon trace (from the opening of + the pipe to the error), you can send the *.CAP file as well.</para></listitem> + ` + <listitem><para>Please think carefully before attaching a document to an email. + Consider pasting the relevant parts into the body of the message. The Samba + mailing lists go to a huge number of people. Do they all need a copy of your + &smb.conf; in their attach directory?</para></listitem> + +</itemizedlist> + +</sect1> + +<sect1> +<title>How to Get Off the Mailing Lists</title> + +<para>To have your name removed from a Samba mailing list, go to the same +place where you went to +subscribe to it. Go to <ulink noescape="1" url="http://lists.samba.org/">http://lists.samba.org</ulink>, +click on your nearest mirror, click on <command>Support</command> and +then click on<command> Samba related mailing lists</command>. +</para> + +<para> +Please do not post messages to the list asking to be removed. You will only +be referred to the above address (unless that process failed in some way). +</para> + +</sect1> + +</chapter> |