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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter�12.�Samba WINS Internals</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.74.0"><link rel="home" href="index.html" title="SAMBA Developers Guide"><link rel="up" href="pt03.html" title="Part�III.�Samba Subsystems"><link rel="prev" href="parsing.html" title="Chapter�11.�The smb.conf file"><link rel="next" href="pwencrypt.html" title="Chapter�13.�LanMan and NT Password Encryption"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter�12.�Samba WINS Internals</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="parsing.html">Prev</a>�</td><th width="60%" align="center">Part�III.�Samba Subsystems</th><td width="20%" align="right">�<a accesskey="n" href="pwencrypt.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="wins"></a>Chapter�12.�Samba WINS Internals</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Gerald</span> <span class="surname">Carter</span></h3></div></div><div><p class="pubdate">October 2002</p></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="wins.html#id2560674">WINS Failover</a></span></dt></dl></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2560674"></a>WINS Failover</h2></div></div></div><p>

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

</p><pre class="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 ]

</pre><p>

A simple example of a valid wins server setting is

</p><pre class="programlisting">

[global]

wins server = 192.168.1.2 192.168.1.3

</pre><p>

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.

</p><p>

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.

</p><pre class="programlisting">

[global]

wins server = 192.168.1.2:eth0 192.168.1.3:eth0 192.168.2.2:eth1

</pre><p>

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.

</p><p>

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.

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