Multiple DNS Configuration in Redhat
Multiple DNS ( Domain Name Server) means configuring a DNS server for more than one IP, which are belongs to different network classes.
Example: DNS Configuration for CLASS B and CLASS C IP address
#vim named.conf
options
{
listen-on port 53 { 127.0.0.1; 192.168. 1.254; 172.16.0.254; };
listen-on-v6 port 53 { : : 1; };
directory “/var/named”;
dump.file
statistics-file
memstatistics file
query-source port 53;
query-source-v6 port 53;
allow-query { localhost; 192.168.1.0/24; 172.16.0.0./16};
allow-transfer { localhost; 192.168.1.254; 172.16.0.254};
forwarders { 192.168.1.254; 172.16.0.254; };
forward only;
};
view localhost_resolver {
match-clients { localhost; 192.168.1.0/24; 172.16.0.0/16; };
match-destinations { localhost; };
recursion yes;
// Configuration for IP 172.16.0.254
// for.zone is forward file for IP 172.16.0.254
include “etc/named.rfc1912.zones”;
zone “example.com” IN {
type master;
file “for.zone”;
allow-update { none; };
};
// rev.zone is reverse file for IP 172.16.0.254
zone “0.16.172.in-addr.arpa” IN {
type master;
file “rev.zone”;
allow-update { none; };
};
Configuration for IP 192.168.1.254
// example.zone is forward file for IP 192.168.1.254
zone “example.net” IN {
type master;
file “example.zone”;
allow-update { none; };
};
// 0.16.172.zone is reverse file for IP 192.168.1.254
zone “1.168.192.in-addr,arpa” IN {
type master;
file “0.16.172.zone”;
allow-update { none; };
}
};
For IP address 172.16.0.254
#vim for.zone
$TTL 86400
@ IN SOA st5.example.com. root.st5.example.com.
42; serial( d.adams)3H;refresh15M;retey1W;expiry1D;miminumIN NS st5.example.com.
st5.example.com. IN A 172.16.254
s1.example.com. IN A 172.16.0.101
s2.example.com. IN A 172.16.0.102
www1.example.com. IN A 172.16.0.101
www2.example.com. IN A 172.16.0.102
#vim rev.zone
$TTL 86400
@ IN SOA st5.example.com. root.st5.example.com.
199702270; serial( d.adams)28800;refresh14400;retey3600000;expiry86400;miminumIN NS st5.abc.com.
254 IN PTR st5.example.com.
101 IN PTR s1.example.com.
102 IN PTR s2.example.com.
For IP address 192.168.1.254
#vim example.zone
$TTL 86400
@ IN SOA st4.example.net. root.st4.example.net.
42; serial( d.adams)3H;refresh15M;retey1W;expiry1D;miminumIN NS st4.example.net.
st4.example.net. IN A 192.168.1.254
A1.example.net. IN A 192.168.1.101
A2.example.net. IN A 192.168.1.102
#vim 0.16.172.zone
$TTL 86400
@ IN SOA st4.example.net. root.st5.example.net.
199702270; serial( d.adams)28800;refresh14400;retey3600000;expiry86400);miminumIN NS st5.example.net.
254 IN PTR st4.example.net.
101 IN PTR A1.example.net.
102 IN PTR A2.example.net.
