Hello all,

Environment - Mixed mode Windows 2000 and 2003 domain controllers.  One
empty root and 8 child domains.   Most domains have 3-5 DCs for redundancy
and DR.  One domain has 25 DCs for their branch offices, but they are not
behind any firewalls.  Two of the domains are behind separate internal
firewalls.  

We currently have the communication going through the firewall via IPSec,
but one of the domains wants the traffic to be "visible" for auditing
purposes.  

Questions - 

Regarding ports required for AD replication over a firewall (using the MS
white paper as a reference), would limiting RPC to one port make ourselves
susceptible to saturation?  There is some client communication to worry
about, from a few clusters. Is there a way to make this entry a range versus
just one port?  
 
Would we have to make this registry modification on all DCs that are not
behind a firewall or just the ones that we would like to limit?  Scenario:
Rootdc is on the Corporate side of the firewall with most of the DCs.
ChildDC1 is also on the Corporate side of the firewall.  ChildDC2 is behind
a divisional firewall.  We make the limited RPC registry entry on Rootdc and
ChildDC2, but do we have to make it on ChildDC1 as well? 

Another q article, 154596, mentions RPC dynamic port allocation as well, but
I noticed it was different registry key than the DC-DC communication.  Would
creating a range this way solve the one port listing from above?   
 

Thank you for your assistance,
Charles


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