Domain trusts?

[arson00]

I have two seperate domains in the same building. One is connected to a t1 and the other a dsl. Each domain has a different ip range but use the same subnet. How would I go about mapping a network drive on the 1st domain that points to a drive on the other domain. I connected the two switches
by crossover cable and configured the dns server on the 1st domain. I can ping by ip address and name, but this doesnt mean that the two domains can necessarily interact with each other. I am definetly missing something here, was thinking about a domain trust relationship, but dont know how to set one up. Any ideas would be very helpful.

Thank you....

 

[Seaspray0]

Its controlled in Active Directory Sites and Services. Here is where you create the trust relationship between domains. Read the help on creating a forest.