Dear Readers,
I am now blessed with having a full 100% Linux laptop at work. The laptop also travels between 2-3 clients with various network settings, all with their own DNS servers.
Usually, DHCP takes care of that and you haven’t got a care in the world.
Until now …. I now have a client with a few VPN’s that can turn on / off for various tasks and all of them push DNS settings to /etc/resolv.conf which makes other domains unreachable.
So the idea popped in my head: How to have different DNS servers for different domain-names on my laptop.
The answer was extremely stupid: install your own DNS server and use 127.0.0.1 as resolving!
See the following example:
[root@laptop:/root] # cat /etc/resolv.conf
domain first.domain.com
search second.domain.com third.domain.com
nameserver 127.0.0.1
nameserver 10.0.0.1
[root@laptop:/root] # tail -50 /etc/named.conf
zone "." IN {
type forward;
forwarders { 10.0.0.1; }; <<<<<<<<<<<<<<< This is the DNS server that DHCP gives you.
};
zone "second.domain.com" IN {
type forward;
forwarders { 192.168.1.1; }; <<<<<<<<<<<< Explicitly name a nameserver for second.domain.com
};
zone "third.domain.com" IN {
type forward;
forwarders { 192.168.2.4; }; <<<<<<<<<<<< Explicitly name a nameserver for third.domain.com
};
Add more domains as you like. This solution will work for as many as 8 of them, because /etc/resolv.conf only supports 8 domain names in its search options.
Of course, you can add more than 8 but then you will have to always type the FQDN for domains 9 and higher.
Mark.