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+<!-- $Id: Bv9ARM.ch05.html,v 1.33.18.33 2007/10/31 01:35:58 marka Exp $ -->
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>Chapter 5. The BIND 9 Lightweight Resolver</title>
+<meta name="generator" content="DocBook XSL Stylesheets V1.71.1">
+<link rel="start" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual">
+<link rel="up" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual">
+<link rel="prev" href="Bv9ARM.ch04.html" title="Chapter 4. Advanced DNS Features">
+<link rel="next" href="Bv9ARM.ch06.html" title="Chapter 6. BIND 9 Configuration Reference">
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+<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 5. The <acronym class="acronym">BIND</acronym> 9 Lightweight Resolver</th></tr>
+<tr>
+<td width="20%" align="left">
+<a accesskey="p" href="Bv9ARM.ch04.html">Prev</a> </td>
+<th width="60%" align="center"> </th>
+<td width="20%" align="right"> <a accesskey="n" href="Bv9ARM.ch06.html">Next</a>
+</td>
+</tr>
+</table>
+<hr>
+</div>
+<div class="chapter" lang="en">
+<div class="titlepage"><div><div><h2 class="title">
+<a name="Bv9ARM.ch05"></a>Chapter 5. The <acronym class="acronym">BIND</acronym> 9 Lightweight Resolver</h2></div></div></div>
+<div class="toc">
+<p><b>Table of Contents</b></p>
+<dl>
+<dt><span class="sect1"><a href="Bv9ARM.ch05.html#id2572269">The Lightweight Resolver Library</a></span></dt>
+<dt><span class="sect1"><a href="Bv9ARM.ch05.html#lwresd">Running a Resolver Daemon</a></span></dt>
+</dl>
+</div>
+<div class="sect1" lang="en">
+<div class="titlepage"><div><div><h2 class="title" style="clear: both">
+<a name="id2572269"></a>The Lightweight Resolver Library</h2></div></div></div>
+<p>
+        Traditionally applications have been linked with a stub resolver
+        library that sends recursive DNS queries to a local caching name
+        server.
+      </p>
+<p>
+        IPv6 once introduced new complexity into the resolution process,
+        such as following A6 chains and DNAME records, and simultaneous
+        lookup of IPv4 and IPv6 addresses.  Though most of the complexity was
+        then removed, these are hard or impossible
+        to implement in a traditional stub resolver.
+      </p>
+<p>
+        <acronym class="acronym">BIND</acronym> 9 therefore can also provide resolution
+        services to local clients
+        using a combination of a lightweight resolver library and a resolver
+        daemon process running on the local host.  These communicate using
+        a simple UDP-based protocol, the "lightweight resolver protocol"
+        that is distinct from and simpler than the full DNS protocol.
+      </p>
+</div>
+<div class="sect1" lang="en">
+<div class="titlepage"><div><div><h2 class="title" style="clear: both">
+<a name="lwresd"></a>Running a Resolver Daemon</h2></div></div></div>
+<p>
+        To use the lightweight resolver interface, the system must
+        run the resolver daemon <span><strong class="command">lwresd</strong></span> or a
+        local
+        name server configured with a <span><strong class="command">lwres</strong></span>
+        statement.
+      </p>
+<p>
+        By default, applications using the lightweight resolver library will
+        make
+        UDP requests to the IPv4 loopback address (127.0.0.1) on port 921.
+        The
+        address can be overridden by <span><strong class="command">lwserver</strong></span>
+        lines in
+        <code class="filename">/etc/resolv.conf</code>.
+      </p>
+<p>
+        The daemon currently only looks in the DNS, but in the future
+        it may use other sources such as <code class="filename">/etc/hosts</code>,
+        NIS, etc.
+      </p>
+<p>
+        The <span><strong class="command">lwresd</strong></span> daemon is essentially a
+        caching-only name server that responds to requests using the
+        lightweight
+        resolver protocol rather than the DNS protocol.  Because it needs
+        to run on each host, it is designed to require no or minimal
+        configuration.
+        Unless configured otherwise, it uses the name servers listed on
+        <span><strong class="command">nameserver</strong></span> lines in <code class="filename">/etc/resolv.conf</code>
+        as forwarders, but is also capable of doing the resolution
+        autonomously if
+        none are specified.
+      </p>
+<p>
+        The <span><strong class="command">lwresd</strong></span> daemon may also be
+        configured with a
+        <code class="filename">named.conf</code> style configuration file,
+        in
+        <code class="filename">/etc/lwresd.conf</code> by default.  A name
+        server may also
+        be configured to act as a lightweight resolver daemon using the
+        <span><strong class="command">lwres</strong></span> statement in <code class="filename">named.conf</code>.
+      </p>
+</div>
+</div>
+<div class="navfooter">
+<hr>
+<table width="100%" summary="Navigation footer">
+<tr>
+<td width="40%" align="left">
+<a accesskey="p" href="Bv9ARM.ch04.html">Prev</a> </td>
+<td width="20%" align="center"> </td>
+<td width="40%" align="right"> <a accesskey="n" href="Bv9ARM.ch06.html">Next</a>
+</td>
+</tr>
+<tr>
+<td width="40%" align="left" valign="top">Chapter 4. Advanced DNS Features </td>
+<td width="20%" align="center"><a accesskey="h" href="Bv9ARM.html">Home</a></td>
+<td width="40%" align="right" valign="top"> Chapter 6. <acronym class="acronym">BIND</acronym> 9 Configuration Reference</td>
+</tr>
+</table>
+</div>
+</body>
+</html>