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One way trust, DMZ forest to internal forest required services accross a firewall. RPC main concern.

Last Modified: 2013-04-05
Currently, I have a DMZ that the ACL's from the DMZ to the Inside need to be specific down to the protocol and port. The DMZ Domain for this example can be called OutDom, and the inside Domain can be called InDom.

The OutDom has a one way trust with InDom. OutDom trusts InDom.

2 DC's for OutDom, and 4 DC's for InDom.

From the two DC's within DMZ Domain "OutDom", What are the ports these machines will be destined too on the InDom DC's.

Currently I am aware of these requirements:

CA, 88/udp and 88/tcp
LDAP, 389/udp and 389/tcp
LDAP SSL, 636/tcp
SMB, 445/udp, 445/tcp
DNS, 53/udp and 53/tcp
RPC, 135/udp and 135/tcp

RPC and the dynamic ports is the part I do not have a clear picture of how to handle.

I am looking to find what specific RPC services must be allowed. I will then look at the possibilities of setting the RPC services statically to specific port. or port ranges on the InDom Domain Controllers.

Any help would be appreciated. Am I missing anything? GC?

I have read the following material but can not determine the specific RPC services required for the trust to function properly.

"Active Directory in Networks Segmented by Firewalls"


"Active Directory Replication over Firewalls"


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