I connected two private networks using a VPN tunnel. The communication between the two networks is working good.

Well, the networks A and B have their own BIND DNS servers for the domains network-a.mycompany.com and network-b.mycompany.com, respectively.

Now, I need the DNS server on network A be able to query to DNS server on network B, and vice versa. The idea is let the users on network A, for example, ask to their own DNS and be able to resolve names from both domains without change the DNS configuration on their computers.

I was reading the BIND manual, but because this is new for me, I don't know what kind of configuration I'm looking for.

How can I do that?

  • 1
    In Windows DNS this is called a Conditional Forwarder. Look for something similarly named in BIND. – joeqwerty Dec 15 '16 at 23:24

Thanks @joeqwerty. It was necessary to edit named.conf on the DNS server in network A.

zone "network-b.mycompany.com" {
    type forward;
    forward only;
    forwarders {; };  // The DNS server's address in network B

Source: Conditional DNS forwarding with named on Linux

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