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<div class="titlepage"><div><div><h1 class="title">
<a name="Bv9ARM.ch05"></a>Chapter5.The <acronym class="acronym">BIND</acronym> 9 Lightweight Resolver</h1></div></div></div>
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<p><b>Table of Contents</b></p>
<dl class="toc"><dt><span class="section"><a href="Bv9ARM.ch05.html#lightweight_resolver">The Lightweight Resolver Library</a></span></dt></dl>
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<a name="lightweight_resolver"></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.
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<p xmlns:db="http://docbook.org/ns/docbook" style="text-align: center;">BIND 9.12.0-pre-alpha</p>
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