DNS caching server config

[fugtruck]

I have a Bind DNS caching-only server setup that is working. I am bringing up a new AD domain controller that will also be a DNS server for that AD but I don't want it responding to any DNS queries except those that are AD related. So, my goal is to leave this caching server as the primary DNS server for stations on the network and have it forward requests for the AD domain to the domain controller. My understanding is that I just need a forward zone for that domain pointing to the domain controller. However it does not seem to be working. So that leaves me to think that my caching server is not forwarding properly.

For example, this AD is going to have a naming convention of hostname.mydomain.local. If I do an nslookup and specify the domain controller's IP address as the server, I can query addresses that exist in DNS on that server, such as dc1.mydomain.local. However, queries to my caching server times out (I get a response from the caching server if I query mydomain.local but none of the objects in that domain).

Any suggestions? Here is my named.conf file:

options {
directory "/var/named";
listen-on { 192.168.0.14; 127.0.0.1; };
forwarders {
<external DNS server IP 1>;
<external DNS server IP 2>;
};
forward first;
};

zone "." in {
type hint;
file "db.cache";
};

zone "0.0.127.in-addr.arpa" in {
type master;
file "db.127.0.0";
};

//forward zone for mydomain.local
zone "mydomain.local" {
type forward;
forwarders {
192.168.1.21;
};
};