The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.
Forward resolution returns an IP address for a specified domain
name. Reverse-name resolution returns a domain name for a
specified IP address. DNS implements reverse-name resolution by
using the special in-addr.arpa
and
ip6.arpa
domains for IPv4 and IPv6.
The characteristics for a zone's in-addr.arpa
or ip6.arpa
domains are usually defined in
/etc/named.conf
, for example:
zone "2.168.192.in-addr.arpa" IN { type master; file "reverse-192.168.2"; allow-update { key “rndc-key”; }; notify yes; };
The zone's name consists of in-addr.arpa
preceded by the network portion of the IP address for the domain
with its dotted quads written in reverse order.
If your network does not have a prefix length that is a multiple of 8, see RFC 2317 for the format that you should use instead.
The PTR
records in
in-addr.arpa
or ip6.arpa
domains define host names that correspond to the host portion of
the IP address. The following example is take from the
/var/named/reverse-192.168.2
zone file:
$TTL 86400 ; @ IN SOA dns.us.mydom.com. root.us.mydom.com. ( 57 ; 28800 ; 7200 ; 2419200 ; 86400 ; ) IN NS dns.us.mydom.com. 1 IN PTR dns.us.mydom.com. 1 IN PTR us.mydom.com. 2 IN PTR svr01.us.mydom.com. 101 IN PTR host01.us.mydom.com. 102 IN PTR host02.us.mydom.com. 103 IN PTR host03.us.mydom.com. ...
For more information, see the BIND documentation in
/usr/share/doc/bind-
.
version
/arm