Stores reverse name resolution information for the named daemon.
The Reverse Data file is one of the DOMAIN data files and contains address to name resolution mapping information for all machines in the name server's zone of authority. The name of the reverse hosts data file is specified in the named boot file. There may be more than one reverse hosts data file per primary name server.
All entries in this file must be in Standard Resource Record Format. Valid resource records in this file are:
Except for comments (starting with a ; (semicolon) and continuing to the end of the line), the resource records in the data files generally follow the format of the resource records that the named daemon returns in response to queries from resolver routines.
Two awk scripts, addrs.awk and hosts.awk, are provided in the /usr/samples/tcpip directory to assist you in converting your existing /etc/hosts file to named data files. The awk scripts also contain instructions for their use. Refer to these files for more information on the conversion.
The following examples show the various ways to use the DOMAIN Reverse Data file. In these examples, two networks are represented: abc and xyz .
Note: Host sandy , a gateway host, is on both networks and also serves as secondary name server for both.
; ;primary reverse host data file for abc - gobi.abc ; @ IN SOA gobi.abc. root.gobi.abc. ( 1:1 ;serial 3600 ;refresh 600 ;retry 3600000;expire 86400 ;minimum ) ;nameservers for abc IN NS gobi.abc. ;other nameservers IN NS kalahari.xyz. 4.201.9.160.in-addr.arpa IN PTR kalahari.xyz ; ;define all hosts in abc 2 IN PTR gobi.abc. 3 IN PTR sandy.abc. 6 IN PTR mojave.abc.
; ;primary reverse host data file for xyz - kalahari.xyz ; @ IN SOA kalahari.xyz. root.kalahari.xyz. ( 1:1 ;serial 3600 ;refresh 600 ;retry 3600000;expire 86400 ;minimum ) ;nameservers for xyz IN NS kalahari.xyz. ;other nameservers IN NS gobi.abc. 2.201.9.192.in-addr.arpa IN PTR gobi.abc ; ;define all hosts in xyz 4.201 IN PTR kalahari.xyz. 13.201 IN PTR sahara.xyz. 5.201 IN PTR lopnor.xyz. 3.201 IN PTR sandy.xyz.
This file is part of TCP/IP in Network Support Facilities in Base Operating System (BOS) Runtime.
/etc/named.boot | Defines how the named daemon initializes the DOMAIN name server file. |
/usr/samples/tcpip/addrs.awk | Sample awk script for converting an /etc/hosts file to an /etc/named.rev file. The awk script also contains directions for its use. |
/usr/samples/tcpip/hosts.awk | Sample awk script for converting an /etc/hosts file to an /etc/named.data file. The awk script also contains directions for its use. |
/usr/samples/tcpip/named.boot | Contains a sample named.boot file, which also contains directions for its use. |
/usr/samples/tcpip/named.data | Contains a sample named.data file, which also contains directions for its use. |
The named daemon.
The DOMAIN Data file format, DOMAIN Cache file format, DOMAIN Local Data file format.
Standard Resource Record Format for TCP/IP.
Naming and Configuring Name Servers in AIX Version 4.3 System Management Guide: Communications and Networks.