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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>
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-</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>
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