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diff --git a/docs/Samba-Developers-Guide/wins.xml b/docs/Samba-Developers-Guide/wins.xml new file mode 100644 index 0000000000..ad3ad67b42 --- /dev/null +++ b/docs/Samba-Developers-Guide/wins.xml @@ -0,0 +1,85 @@ +<?xml version="1.0" encoding="iso-8859-1"?> +<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [ + <!ENTITY % global_entities SYSTEM '../entities/global.entities'> + %global_entities; +]> +<chapter id="wins"> +<chapterinfo> + <author> + <firstname>Gerald</firstname><surname>Carter</surname> + </author> + <pubdate>October 2002</pubdate> +</chapterinfo> + + +<title>Samba WINS Internals</title> + + +<sect1> +<title>WINS Failover</title> + + +<para> +The current Samba codebase possesses the capability to use groups of WINS +servers that share a common namespace for NetBIOS name registration and +resolution. The formal parameter syntax is +</para> + +<para><programlisting> + WINS_SERVER_PARAM = SERVER [ SEPARATOR SERVER_LIST ] + WINS_SERVER_PARAM = "wins server" + SERVER = ADDR[:TAG] + ADDR = ip_addr | fqdn + TAG = string + SEPARATOR = comma | \s+ + SERVER_LIST = SERVER [ SEPARATOR SERVER_LIST ] +</programlisting></para> + +<para> +A simple example of a valid wins server setting is +</para> + +<para><programlisting> +[global] + wins server = 192.168.1.2 192.168.1.3 +</programlisting></para> + +<para> +In the event that no TAG is defined in for a SERVER in the list, smbd assigns a default +TAG of "*". A TAG is used to group servers of a shared NetBIOS namespace together. Upon +startup, nmbd will attempt to register the netbios name value with one server in each +tagged group. +</para> + +<para> +An example using tags to group WINS servers together is show here. Note that the use of +interface names in the tags is only by convention and is not a technical requirement. +</para> + + +<para><programlisting> +[global] + wins server = 192.168.1.2:eth0 192.168.1.3:eth0 192.168.2.2:eth1 +</programlisting></para> + +<para> +Using this configuration, nmbd would attempt to register the server's NetBIOS name +with one WINS server in each group. Because the "eth0" group has two servers, the +second server would only be used when a registration (or resolution) request to +the first server in that group timed out. +</para> + +<para> +NetBIOS name resolution follows a similar pattern as name registration. When resolving +a NetBIOS name via WINS, smbd and other Samba programs will attempt to query a single WINS +server in a tagged group until either a positive response is obtained at least once or +until a server from every tagged group has responded negatively to the name query request. +If a timeout occurs when querying a specific WINS server, that server is marked as down to +prevent further timeouts and the next server in the WINS group is contacted. Once marked as +dead, Samba will not attempt to contact that server for name registration/resolution queries +for a period of 10 minutes. +</para> + +</sect1> +</chapter> |