Hello Rush,
Domain C isn't needed, you can create an external trust between A and B direct.
Start with DNS:
http://technet.microsoft.com/en-us/l...76(WS.10).aspx
And then the trust, either for one side:
http://technet.microsoft.com/en-us/l...33(WS.10).aspx
Or direct for both sides:
http://technet.microsoft.com/en-us/l...00(WS.10).aspx
Important ports for the trust to be opened:
http://support.microsoft.com/kb/179442
Best regards
Meinolf Weber
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> Domain A and B need to make Trust relationship, both domains
> separated. Domain A is Parent Top Domain, Domain B i s Domain C's is
> child domain. Network access/firewall fully open between domain A and
> B. Domain A doesn't have routing access to B's parent Domain C. Both
> Domain A and B has domain administrator account to perform this
> task.In this condition can we create an intransitive trust against
> Domain A and B? if not what steps necessary to take?
>