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This guide is not obsolete but needs an update. Signed-off-by: Karolin Seeger <kseeger@samba.org> Reviewed-by: Andreas Schneider <asn@samba.org> Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org> Autobuild-Date(master): Wed May 10 19:57:36 CEST 2017 on sn-devel-144
82 lines
2.6 KiB
XML
82 lines
2.6 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!DOCTYPE chapter PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
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<chapter id="wins">
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<chapterinfo>
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<author>
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<firstname>Gerald</firstname><surname>Carter</surname>
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</author>
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<pubdate>October 2002</pubdate>
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</chapterinfo>
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<title>Samba WINS Internals</title>
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<sect1>
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<title>WINS Failover</title>
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<para>
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The current Samba codebase possesses the capability to use groups of WINS
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servers that share a common namespace for NetBIOS name registration and
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resolution. The formal parameter syntax is
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</para>
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<para><programlisting>
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WINS_SERVER_PARAM = SERVER [ SEPARATOR SERVER_LIST ]
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WINS_SERVER_PARAM = "wins server"
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SERVER = ADDR[:TAG]
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ADDR = ip_addr | fqdn
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TAG = string
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SEPARATOR = comma | \s+
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SERVER_LIST = SERVER [ SEPARATOR SERVER_LIST ]
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</programlisting></para>
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<para>
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A simple example of a valid wins server setting is
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</para>
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<para><programlisting>
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[global]
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wins server = 192.168.1.2 192.168.1.3
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</programlisting></para>
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<para>
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In the event that no TAG is defined in for a SERVER in the list, smbd assigns a default
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TAG of "*". A TAG is used to group servers of a shared NetBIOS namespace together. Upon
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startup, nmbd will attempt to register the netbios name value with one server in each
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tagged group.
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</para>
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<para>
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An example using tags to group WINS servers together is show here. Note that the use of
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interface names in the tags is only by convention and is not a technical requirement.
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</para>
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<para><programlisting>
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[global]
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wins server = 192.168.1.2:eth0 192.168.1.3:eth0 192.168.2.2:eth1
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</programlisting></para>
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<para>
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Using this configuration, nmbd would attempt to register the server's NetBIOS name
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with one WINS server in each group. Because the "eth0" group has two servers, the
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second server would only be used when a registration (or resolution) request to
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the first server in that group timed out.
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</para>
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<para>
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NetBIOS name resolution follows a similar pattern as name registration. When resolving
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a NetBIOS name via WINS, smbd and other Samba programs will attempt to query a single WINS
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server in a tagged group until either a positive response is obtained at least once or
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until a server from every tagged group has responded negatively to the name query request.
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If a timeout occurs when querying a specific WINS server, that server is marked as down to
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prevent further timeouts and the next server in the WINS group is contacted. Once marked as
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dead, Samba will not attempt to contact that server for name registration/resolution queries
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for a period of 10 minutes.
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</para>
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</sect1>
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</chapter>
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