Two-Way Forest Trust DNS question

claudiamcse
claudiamcse used Ask the Experts™
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What is the best way to setup DNS for Cross Forest Trusts.
Options to setup DNS for two way cross forest trusts are below:

1. If there is a root DNS server that can be made the root DNS server for both of the forest DNS namespaces, make it the root server by ensuring that the root zone contains delegations for each of the DNS namespaces. Also, update the root hints of all DNS servers with the new root DNS server.

Note: I have two AD, DNS servers in the souce forestA and one AD, DNS server in the target forestB



2. configure DNS conditional forwarders in each DNS namespace to route queries for names in the other namespace
3. configure DNS secondary zones in each DNS namespace to route queries for names in the other namespace.


I am doing cross forest migration from Exchange 2003 to Exchange 2010
When I migrate users to the new forest. They will still need to be able to access resources in the source forest, and access some servers on the old forest.

Thank you
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Top Expert 2012
Commented:
Configure Conditional Forwarders is the easiest way to configure really this would do the same as creating a secondary DNS zone instead it just forwards the requests to the other DNS server to resolve which is just like using a secondary zone on another server.
Chris DentPowerShell Developer
Top Expert 2010

Commented:

Don't forget Stub Zones, they work very well for this too.

Chris

Author

Commented:
Now, I am not sure which solution is better... Stub Zones or forwarders? I havent seen stub zones mentioned on microsoft web site. http://technet.microsoft.com/en-us/library/cc756852(WS.10).aspx



Chris DentPowerShell Developer
Top Expert 2010

Commented:

Stub Zones should be lower maintenance (if your name servers change a lot), but Conditional Forwarders will work just as well (if they do not).

It doesn't make a great deal of difference beyond that.

Chris
Top Expert 2012

Commented:
I would have to agree with Chris Stub Zones or Conditional Forwarders but usually Forwarders are used on a simple Forest Trust without many changes happening with the DNS servers.

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