Məlumat bazası: DNS

rDNS with CNAME Delegation

RFC2317 covers the special cases with a netmask longer than /24. Within this way you can delegate your own prefix for example 172.16.0.8/29, useable IP addresses from 172.16.0.8 - 172.16.0.15.

In 0.16.172.in-addr.arpa zone it will be looks like these below

8-15
8-15
8
9
10
11
12
13
14
15		 IN
IN
IN
IN
IN
IN
IN
IN
IN
IN		 NS
NS
CNAME
CNAME
CNAME
CNAME
CNAME
CNAME
CNAME
CNAME		 ns1.customer.com.
ns2.customer.com. 
8.8-15.0.16.172.in-addr.arpa.
9.8-15.0.16.172.in-addr.arpa.
10.8-15.0.16.172.in-addr.arpa.
11.8-15.0.16.172.in-addr.arpa.
12.8-15.0.16.172.in-addr.arpa.
13.8-15.0.16.172.in-addr.arpa.
14.8-15.0.16.172.in-addr.arpa.
15.8-15.0.16.172.in-addr.arpa.

In customer nameserver(ns1.customer.com & ns2.customer.com) side, customer must add these into named.conf
zone "8-15.0.16.172.in-addr.arpa" {
  type master;
  file "8-15.0.16.172.in-addr.arpa.db";
};

Create 8-15.0.16.172.in-addr.arpa.db in named base dir, usually /var/named
8
9
10
11
12
13
14
15		 IN
IN
IN
IN
IN
IN
IN
IN		 CNAME
CNAME
CNAME
CNAME
CNAME
CNAME
CNAME
CNAME		 sales.customer.com.
support.customer.com.
hrd.customer.com.
management.customer.com.
network.customer.com.
admin.customer.com.
abuse.customer.com.
webmaster.customer.

Last step, reload named
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