DNS configuration for new forest trust

In a test environment, I have two forests: abc.local and def.local. Within each forest, the downstream domains work fine.

I want to create a forest trust between the two.

I have VPN tunnels between the two, and I can ping the respective DC's.
abc.local has all 2008R2 boxes, and def.local has 2003SP2 DC's.

I don't know how to configure DNS to make this happen, which I think is necessary before I can create the trust. Do I just create a simple primary zone in each domain that contains only the Host A record of one of the DC's, or do I create a new DNS domain. If the latter, what do I assign for the SOA records?

In my configuration, dc1.abc.local is 192.168.33.10. For def.local, dc1.def.local is 192.168.2.10.

Thanks in advance.
ovidbaileyAsked:
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WaseemsCommented:
you can use conditional forwarding from each server to the other server based on the other domain name
OR
you can create secondary zone for the other zone on each server
but only creating the primary zone with host record will not work because SRV records are required for the connection
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abt-itCommented:
First of all, you need correct routing between these networks. After that, add a forwarder for abc.local at the DNS of def.local and vice versa. That should work.
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ovidbaileyAuthor Commented:
Thanks for the replies. I'll try it both ways. Pinging by address works fine in both directions.

When I create the conditional forwarder on the def.local box (2003), it works just fine; I can ping all the resources on the abc domain.

But when I try to do the same thing on the abc.com domain (2008R2) in the separate Forwarders folder, it identifies the server name OK, but says that "The server wtih this IP address is not authoritative for the required zone.". What did I do wrong?
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ovidbaileyAuthor Commented:
On the 2003 box itself, all of the records (including SOA) look just fine.
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WaseemsCommented:
may be it is the firewall on win2003 which block the request try openning port UDP 53 on windows 2003
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ovidbaileyAuthor Commented:
Yeah, that was it. My router was getting really flaky and finally died right in the middle of my testing. Never easy, is it? Thanks.
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