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AD & DNS

I am having a lot of trouble with Active Directory/DNS.  I have three subnets with two domains originally setup under NT4.  The first domain on subnet 1 was converted to Windows 2000 with Active Directory and DNS using two domain controllers. DC 1 is the Global Catalog server and DC2 is the Infrastructure Update Master.  Subnet 2 is at a remote site connected through a VPN router. This site has a DC (DC3) for servicing logon requests for their local users and simply supplies file services. This site belongs to the first domain.

Subnet 3 belongs to Domain #2.  I upgraded the DC (DC4) in the second domain and made it a child domain of Domain 1.

My questions are:
1.) Should the DC at the remote site (parent domain) and the DC on subnet 3 (child domain) each be GC servers?

2.)Should all the servers point to themselves as the Preferred DNS server?

3.) Are there any other special considerations for this type of environment?
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JamesDS

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James,
Thanks for the quick reply.
Another question:  Should i have seperate AD sites for my main location (domain 1), my remote site (domain 1) and domain 2?  Right now I do (Site 1, Site 2 (remote site) Site 3 (second domain)). I setup the 3 subnets and assigned them to the corresponding AD sites?  
Should the remote network be under Site 1 since it belongs to the same domain? Am I all wet on this?

There are not of users at our remote site but they are important.
Thanks,
Greg
Greg

Yup, seperate subnets, otherwise your users will logon to a random DC, not the one closest

Create new sites for each location and move your remote DCs into those sites.
Cheers

JamesDS