I have the following proposed setup for me and a bunch of friends of mine. We're all geeks and we're doing this for the sheer experience all of us will get by doing it. My server here at my house is going to be a domain controller and it will replicate to several other domain controllers around the country; one in Canton, Mass, and the other in Dallas, Texas. My questions are as follows. If I change some of the default ports for replication on all domain controllers, then do I have to change all the ports? And if I have to change the LDAP port, how is that going to affect two domain controllers at the same site to replicate amongst each other? Or is the replication port different than the logon port? (Logon uses DNS, but does it also use LDAP?) Part of this whole thing, is that we're doing this for the sheer fun of it and the experience, so don't be surprised if you see more questions along the way. Thanks for any feedback or answers you have.