what firewall ports need to be opened before setting up a domain trust?

i will be setting up a 2 way domain trust this weekend between 2 domains
one domain has 2 sites, and 4 domain controllers (call this domain1)
the other domain has 6 sites and about 8-10 domain controllers (call this domain2) each of the DCs are paired up, and on different networks (i.e. 2 are on 10.1.1.x, 2 are on 10.1.2.x, etc)
there are firewalls between all of the sites

so my question is- what ports need to be opened, and what servers would i need to open these ports for?
do i need to open all the ports to all the domain controllers to/from domain1 and domain2? or can i just open ports to/from 2 of the domain controllers in domain2, to domain1?
im sure this is confusing
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Mike KlineCommented:
Here is the list of of ports that need to be opened for 2012 use the 2008 settings

Ports should be opened to PDEc in domain 1 to talk to PDCe in domain 2.  Also make sure name resolution works between the two domains (conditional forwarders are one way to do that)


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jsctechyAuthor Commented:
thanks Mike
when you say PDEc, do you mean the domain controller that holds the PDC emulator role?
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Windows Server 2003

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