what are the firewall ports that are required to be opened for communication betwen two domain controllers running windows 2000 advanced server

I have two domain controllers running windows 2000 advanced server in two different forests.
two firewalls have been placed before each domain controller .
I have  to create two way trust relationship between these two forests.
what are ports that are to be opened in the firewall in order that the trust relationship can be created and there would be proper communication between these two domain controllers.
pageastAsked:
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craigothyConnect With a Mentor Commented:
This should help
http://technet.microsoft.com/en-us/library/cc756944.aspx#w2k3tr_trust_tools_knfk
Click on "Network Ports used by Trusts"
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pageastAuthor Commented:
are any other ports required for dns communication.
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craigothyConnect With a Mentor Commented:
yes, if you need dns resolution/zone transfers through the firewall you will need 53(tcp & udp)
also, if you need wins, 42(tcp & udp)
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