This file (192.168.0.rev) is the sample reverse map zone file used throughout this Chapter and has the following characteristics.
The Resource Records are all defined separately.
$TTL 86400 ; 24 hours could have been written as 24h $ORIGIN 0.168.192.IN-ADDR.ARPA. @ 1D IN SOA ns1.example.com. hostmaster.example.com. ( 2002022401 ; serial 3H ; refresh 15 ; retry 1w ; expire 3h ; minimum ) ; server host definitions 1 IN PTR ns1.example.com. 5 IN PTR ns2.example.com. 2 IN PTR www.example.com. ; non server domain hosts 3 IN PTR bill.example.com. 4 IN PTR fred.example.com.
Hosts defined with CNAME Resource Records do not have PTR records associated. This is not any form of BIND rule. A IP address can only be defined once with a PTR RR. It could be either the A record or the CNAME record - we just happened to choose the A RR.
3 reverse map
4 dns types
5 install bind
8 dns records
12 bind api's
13 dns security
bits & bytes
notes & tips