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7e209b78ca757294dbbc15604c88673b3a6b0c39Timo Sirainen>The BIND 9 Lightweight Resolver</TITLE
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24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenTITLE="BIND 9 Administrator Reference Manual"
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24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenTITLE="Advanced DNS Features"
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24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenTITLE="BIND 9 Configuration Reference"
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24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>BIND 9 Administrator Reference Manual</TH
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen></TR
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><TR
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db0735f9b388c5bcfb781b1b25015e898d63d953Timo Sirainen>Prev</A
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db0735f9b388c5bcfb781b1b25015e898d63d953Timo Sirainen><TD
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24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><A
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24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>Next</A
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7e209b78ca757294dbbc15604c88673b3a6b0c39Timo Sirainen><DIV
7e209b78ca757294dbbc15604c88673b3a6b0c39Timo SirainenCLASS="chapter"
db0735f9b388c5bcfb781b1b25015e898d63d953Timo Sirainen><H1
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><A
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenNAME="ch05"
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen></A
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>Chapter 5. The <ACRONYM
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenCLASS="acronym"
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>BIND</ACRONYM
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen> 9 Lightweight Resolver</H1
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen><DIV
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenCLASS="TOC"
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><DL
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><DT
db0735f9b388c5bcfb781b1b25015e898d63d953Timo Sirainen><B
db0735f9b388c5bcfb781b1b25015e898d63d953Timo Sirainen>Table of Contents</B
db0735f9b388c5bcfb781b1b25015e898d63d953Timo Sirainen></DT
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><DT
db0735f9b388c5bcfb781b1b25015e898d63d953Timo Sirainen>5.1. <A
db0735f9b388c5bcfb781b1b25015e898d63d953Timo SirainenHREF="Bv9ARM.ch05.html#AEN1034"
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>The Lightweight Resolver Library</A
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen></DT
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><DT
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>5.2. <A
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenHREF="Bv9ARM.ch05.html#lwresd"
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>Running a Resolver Daemon</A
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen></DT
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen></DL
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen></DIV
d23c747de9d33966483fbdd41f08ad7766da7c5cTimo Sirainen><DIV
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenCLASS="sect1"
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen><H1
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenCLASS="sect1"
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><A
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenNAME="AEN1034"
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>5.1. The Lightweight Resolver Library</A
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen></H1
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><P
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>Traditionally applications have been linked with a stub resolver
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainenlibrary that sends recursive DNS queries to a local caching name
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainenserver.</P
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><P
bcdb6c0bd2e7dbb34b306d3d8c2383a7d7654612Timo Sirainen>IPv6 once introduced new complexity into the resolution process,
bcdb6c0bd2e7dbb34b306d3d8c2383a7d7654612Timo Sirainensuch as following A6 chains and DNAME records, and simultaneous
bcdb6c0bd2e7dbb34b306d3d8c2383a7d7654612Timo Sirainenlookup of IPv4 and IPv6 addresses. Though most of the complexity was
bcdb6c0bd2e7dbb34b306d3d8c2383a7d7654612Timo Sirainenthen removed, these are hard or impossible
bcdb6c0bd2e7dbb34b306d3d8c2383a7d7654612Timo Sirainento implement in a traditional stub resolver.</P
bcdb6c0bd2e7dbb34b306d3d8c2383a7d7654612Timo Sirainen><P
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>Instead, <ACRONYM
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenCLASS="acronym"
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>BIND</ACRONYM
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen> 9 provides resolution services to local clients
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainenusing a combination of a lightweight resolver library and a resolver
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainendaemon process running on the local host. These communicate using
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainena simple UDP-based protocol, the "lightweight resolver protocol"
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainenthat is distinct from and simpler than the full DNS protocol.</P
d23c747de9d33966483fbdd41f08ad7766da7c5cTimo Sirainen></DIV
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen><DIV
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenCLASS="sect1"
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><H1
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenCLASS="sect1"
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen><A
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo SirainenNAME="lwresd"
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen>5.2. Running a Resolver Daemon</A
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen></H1
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen><P
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>To use the lightweight resolver interface, the system must
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainenrun the resolver daemon <B
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenCLASS="command"
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>lwresd</B
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen> or a local
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainenname server configured with a <B
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenCLASS="command"
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen>lwres</B
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen> statement.</P
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen><P
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>By default, applications using the lightweight resolver library will make
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo SirainenUDP requests to the IPv4 loopback address (127.0.0.1) on port 921. The
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainenaddress can be overridden by <B
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo SirainenCLASS="command"
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen>lwserver</B
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen> lines in
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen<TT
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo SirainenCLASS="filename"
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>/etc/resolv.conf</TT
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>.</P
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen><P
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen>The daemon currently only looks in the DNS, but in the future
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainenit may use other sources such as <TT
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenCLASS="filename"
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen>/etc/hosts</TT
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen>,
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenNIS, etc.</P
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen><P
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen>The <B
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenCLASS="command"
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen>lwresd</B
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen> daemon is essentially a
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainencaching-only name server that responds to requests using the lightweight
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainenresolver protocol rather than the DNS protocol. Because it needs
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainento run on each host, it is designed to require no or minimal configuration.
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenUnless configured otherwise, it uses the name servers listed on
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen<B
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenCLASS="command"
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen>nameserver</B
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen> lines in <TT
111a7dda02defa4d612468cfc3c40da5240645afTimo SirainenCLASS="filename"
111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen>/etc/resolv.conf</TT
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainenas forwarders, but is also capable of doing the resolution autonomously if
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainennone are specified.</P
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen><P
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>The <B
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo SirainenCLASS="command"
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>lwresd</B
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen> daemon may also be configured with a
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen<TT
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo SirainenCLASS="filename"
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>named.conf</TT
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen> style configuration file, in
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen<TT
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo SirainenCLASS="filename"
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>/etc/lwresd.conf</TT
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen> by default. A name server may also
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainenbe configured to act as a lightweight resolver daemon using the
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen<B
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo SirainenCLASS="command"
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>lwres</B
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen> statement in <TT
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo SirainenCLASS="filename"
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>named.conf</TT
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen>.</P
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen></DIV
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen></DIV
834f2b9f60d93e4c7dfc6992e692f5b7213a1b11Timo Sirainen><DIV
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111a7dda02defa4d612468cfc3c40da5240645afTimo Sirainen><HR
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24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>Advanced DNS Features</TD
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24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen>BIND</ACRONYM
24e5e4526d8f5cbc056ab97fd0d154d0936d7a5eTimo Sirainen> 9 Configuration Reference</TD
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