Bv9ARM.ch05.html revision 9dafd058e3cfdd8218247811cea792588ec19052
84862dd927c6e36b236ce76e2d192564c9e3ec1eLuke Smith<HTML
85e08d7420a5c71ffdd9517a3179d29b9a32b1dfTodd Kloots><HEAD
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>The BIND 9 Lightweight Resolver</TITLE
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore><META
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85e08d7420a5c71ffdd9517a3179d29b9a32b1dfTodd KlootsTITLE="BIND 9 Administrator Reference Manual"
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84862dd927c6e36b236ce76e2d192564c9e3ec1eLuke SmithTITLE="Advanced Concepts"
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84862dd927c6e36b236ce76e2d192564c9e3ec1eLuke SmithTITLE="BIND 9 Configuration Reference"
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24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore><TR
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smith><TH
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>BIND 9 Administrator Reference Manual</TH
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smith></TR
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smith><TR
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37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smith><A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithHREF="Bv9ARM.ch04.html"
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore>Prev</A
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore></TD
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithHREF="Bv9ARM.ch06.html"
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore>Next</A
611ed6133b545686c09585a898b866cfd64b22dcLuke Smith></TD
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="chapter"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><H1
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithNAME="ch05"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>Chapter 5. The <SPAN
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="acronym"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>BIND</SPAN
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith> 9 Lightweight Resolver</A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></H1
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><DIV
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="TOC"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><DL
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore><DT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><B
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>Table of Contents</B
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></DT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><DT
611ed6133b545686c09585a898b866cfd64b22dcLuke Smith>5.1. <A
611ed6133b545686c09585a898b866cfd64b22dcLuke SmithHREF="Bv9ARM.ch05.html#AEN1034"
611ed6133b545686c09585a898b866cfd64b22dcLuke Smith>The Lightweight Resolver Library</A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></DT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><DT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>5.2. <A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithHREF="Bv9ARM.ch05.html#lwresd"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>Running a Resolver Daemon</A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></DT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></DL
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></DIV
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><DIV
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="sect1"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><H1
24c6558f0c5a695a01b3091cea55a968f9904f95Adam MooreCLASS="sect1"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithNAME="AEN1034"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>5.1. The Lightweight Resolver Library</A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></H1
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><P
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>Traditionally applications have been linked with a stub resolver
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moorelibrary that sends recursive DNS queries to a local caching name
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smithserver.</P
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore><P
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore>IPv6 introduces new complexity into the resolution process,
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Mooresuch as following A6 chains and DNAME records, and simultaneous
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smithlookup of IPv4 and IPv6 addresses. These are hard or impossible
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Mooreto implement in a traditional stub resolver.</P
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><P
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>Instead, <SPAN
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="acronym"
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore>BIND</SPAN
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith> 9 provides resolution services to local clients
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smithusing a combination of a lightweight resolver library and a resolver
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smithdaemon process running on the local host. These communicate using
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smitha simple UDP-based protocol, the "lightweight resolver protocol"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smiththat is distinct from and simpler than the full DNS protocol.</P
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore></DIV
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><DIV
24c6558f0c5a695a01b3091cea55a968f9904f95Adam MooreCLASS="sect1"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><H1
24c6558f0c5a695a01b3091cea55a968f9904f95Adam MooreCLASS="sect1"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><A
24c6558f0c5a695a01b3091cea55a968f9904f95Adam MooreNAME="lwresd"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>5.2. Running a Resolver Daemon</A
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore></H1
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><P
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore>To use the lightweight resolver interface, the system must
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smithrun the resolver daemon <B
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="command"
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore>lwresd</B
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>.</P
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore><P
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>By default, applications using the lightweight resolver library will make
24c6558f0c5a695a01b3091cea55a968f9904f95Adam MooreUDP requests to the IPv4 loopback address (127.0.0.1) on port 921. The
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smithaddress can be overriden by <B
24c6558f0c5a695a01b3091cea55a968f9904f95Adam MooreCLASS="command"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>lwserver</B
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore> lines in
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith<TT
24c6558f0c5a695a01b3091cea55a968f9904f95Adam MooreCLASS="filename"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>/etc/resolv.conf</TT
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore>.
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithThe daemon will try to find the answer to the questions "what are the
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smithaddresses for host
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith<TT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="literal"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>foo.example.com</TT
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore>?" and "what are
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smiththe names for IPv4 address 10.1.2.3?"</P
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smith><P
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smith>The daemon currently only looks in the DNS, but in the future
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smithit may use other sources such as <TT
611ed6133b545686c09585a898b866cfd64b22dcLuke SmithCLASS="filename"
611ed6133b545686c09585a898b866cfd64b22dcLuke Smith>/etc/hosts</TT
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smith>,
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke SmithNIS, etc.</P
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smith><P
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smith>The <B
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke SmithCLASS="command"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>lwresd</B
611ed6133b545686c09585a898b866cfd64b22dcLuke Smith> daemon is essentially a
611ed6133b545686c09585a898b866cfd64b22dcLuke Smithcaching-only name server that answers requests using the lightweight
611ed6133b545686c09585a898b866cfd64b22dcLuke Smithresolver protocol rather than the DNS protocol. Because it needs
611ed6133b545686c09585a898b866cfd64b22dcLuke Smithto run on each host, it is designed to require no or minimal configuration.
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke SmithUnless configured otherwise, it uses the name servers listed on
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith<B
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke SmithCLASS="command"
611ed6133b545686c09585a898b866cfd64b22dcLuke Smith>nameserver</B
611ed6133b545686c09585a898b866cfd64b22dcLuke Smith> lines in <TT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="filename"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>/etc/resolv.conf</TT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smithas forwarders, but is also capable of doing the resolution autonomously if
37afd8be00b8e92463a3fdcaa6fc1b2809b8256eLuke Smithnone are specified.</P
85e08d7420a5c71ffdd9517a3179d29b9a32b1dfTodd Kloots><P
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>The <B
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="command"
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore>lwresd</B
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith> daemon may also be configured with a
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith<TT
611ed6133b545686c09585a898b866cfd64b22dcLuke SmithCLASS="filename"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>named.conf</TT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith> style configuration file, in
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith<TT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="filename"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>/etc/lwresd.conf</TT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith> by default. A name server may also
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smithbe configured to act as a lightweight resolver daemon using the
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith<B
24c6558f0c5a695a01b3091cea55a968f9904f95Adam MooreCLASS="command"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>lwres</B
611ed6133b545686c09585a898b866cfd64b22dcLuke Smith> statement in <TT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="filename"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>named.conf</TT
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>.</P
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></DIV
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></DIV
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><DIV
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="NAVFOOTER"
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore><HR
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCELLSPACING="0"
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore><TR
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><TD
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithVALIGN="top"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithHREF="Bv9ARM.ch04.html"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>Prev</A
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore></TD
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithALIGN="center"
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><A
24c6558f0c5a695a01b3091cea55a968f9904f95Adam MooreHREF="Bv9ARM.html"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>Home</A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></TD
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithHREF="Bv9ARM.ch06.html"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>Next</A
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith></TD
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><TR
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><TD
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithVALIGN="top"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>Advanced Concepts</TD
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><TD
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithALIGN="center"
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>&nbsp;</TD
24c6558f0c5a695a01b3091cea55a968f9904f95Adam Moore><TD
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288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithALIGN="right"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithVALIGN="top"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith><SPAN
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke SmithCLASS="acronym"
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith>BIND</SPAN
288cb1eb48cf1e1756380d500de92f74ac32ec60Luke Smith> 9 Configuration Reference</TD
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