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Reverse name lookups are enabled using a reverse mapping file. Reverse mapping files map fully qualified domain names to IP addresses. This reverse lookup capability is unnecessary, but it is convenient to have. With reverse mapping, when users access remote hosts, their domain name address can be used to identify their own host, instead of only the IP address. The name of the file can be anything you want. On most current distributions, it is the zone's domain address (the network part of a zone's IP address). For example, the reverse mapping file for a zone with the IP address of 192.168.1.1 is 192.168.1. Its full pathname would be something like /var/named/192.168.1. On some systems using older implementations of BIND, the reverse mapping filename may consist of the root name of the zone file with the extension .rev. For example, if the zone file is called mytrek.com, the reverse mapping file would be called something like mytrek.rev. The zone entry for a reverse mapping in the
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named.conf file uses a special domain name consisting of the IP address in reverse, with an IN-ADDR.ARPA extension. This reverse IP address becomes the zone domain referenced by the @ symbol in the reverse mapping file. For example, the reverse mapping zone name for a domain with the IP address of 192.168.43 would be 43.168.192.IN-ADDR.ARPA. In the following example, the reverse domain name for the domain address 192.168.1 is 1.168.192.IN-ADDR.ARPA:
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zone "1.168.192.IN-ADDR.ARPA" in { type master; file "192.168.1"; };
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A reverse mapping file begins with an SOA record, which is the same as that used in a forward mapping file. Resource records for each machine defined in the forward mapping file then follow. These resource records are PTR records that point to hosts in the zone. These must be actual hosts, not aliases defined with CNAME records. Records for reverse mapping begin with a reversed IP address. Each segment in the IP address is sequentially reversed. Each segment begins with the host ID, followed by reversed network numbers. If you list only the host ID with no trailing period, the zone domain is automatically attached. In the case of a reverse mapping file, the zone domain as specified in the zone statement is the domain IP address backward. The 1 expands to 1.1.168.192. In the following example, turtle and lizard inherit the domain IP address, whereas rabbit has its explicitly entered:
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; reverse mapping of domain names 1.168.192.IN-ADDR.ARPA ; @ IN SOA turtle.mytrek.com. hostmaster.turtle.mytrek.com.( 92050300 ; Serial (yymmddxx format) 10800 ; Refresh 3hHours 3600 ; Retry 1 hour 3600000 ; Expire 1000 hours 86400 ) ; Minimum 24 hours @ 1 2.1.168.192 3 IN IN IN IN NS PTR PTR PTR turtle.mytrek.com. turtle.mytrek.com. rabbit.mytrek.com. lizard.mytrek.com.
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A localhost reverse mapping file implements reverse mapping for the local loopback interface known as localhost, whose network address is 127.0.0.1. This file can be any name. On most systems, localhost is given the name named.local. On other systems, localhost may use the network part of the IP address, 127.0.0. This file allows mapping the domain name localhost to the localhost IP address, which is always 127.0.0.1 on every machine. The address 127.0.0.1 is a special address that functions as the local address for your machine. It allows a machine to address itself. In the zone statement for this file, the name of the zone is 0.0.127.IN-ADDR.ARPA. The domain part of the IP address is entered in reverse order, with IN-ADDR.ARPA appended to it, 0.0.127.IN- ADDR.ARPA. The named.conf entry is shown here:
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zone "0.0.127.IN-ADDR.ARPA" { type master; file "named.local"; };
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The name of the file used for the localhost reverse mapping file is usually named.local, though it can be any name. The NS record specifies the name server localhost should use. This file has a PTR record that maps the IP address to the localhost. The 1 used as the name expands to append the zone domain-in this case, giving you 1.0.0.127, a reverse IP address. The contents of the named.local file are shown here. Notice the trailing periods for localhost.
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@ IN SOA localhost. root.localhost. ( 1997022700 ; Serial 28800 ; Refresh 14400 ; Retry 3600000 ; Expire 86400 ) ; Minimum 1 IN IN NS PTR turtle.mytrek.com. localhost.
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