dns - BIND - how to return a different IP based on request's subnet

Question

We have an intranet DNS server (system-config-bind on RHEL) serving office A, and a VPN connecting offices A and B. Office A has a server named "dev".

In office A, to access a server "dev" on the local network, the address is 192.168.1.13

In office B, to access a server "dev" over the VPN, the address is 192.168.2.13

My question is this - can I set the DNS server to return a different IP for "dev" based on the subnet of the incoming request?

Example: In office A, BIND returns 192.168.1.13 as the "dev" IP, because the originating request is from the 192.168.1/24 subnet.

In office B, BIND returns 192.168.2.13 as the "dev" IP, because the originating request is from the 192.168.2/24 subnet.

Answer 1

You need to use views:

view "officeA" {
   match-clients { 192.168.1.0/24; };

   include "/etc/named.conf.zones-rfc1912";
   include "/etc/named.conf.zones-common";
   include "/etc/named.conf.zones-officeA";
};

view "officeB" {
   match-clients { 192.168.2.0/24; };

   include "/etc/named.conf.zones-rfc1912";
   include "/etc/named.conf.zones-common";
   include "/etc/named.conf.zones-officeB";
};