How to join a remote domain over IPSec?

We have 2 offices, the main office network details below:
ADSL Modem(Static IP) -> FireWall(192.168.100.1) -> Internal network(192.168.100.2-254)
The remote office network details below:
ADSL Modem(Static IP) -> FireWall(192.168.200.1) -> Internal network(192.168.200.2-254)

The VPN(IPSec) is established between these two sites thought the FireWall, also all IP addresses fromboth sites are dynamic assigned by the firewall. The PCs in both sites can ping each only by IP Addresses but not PC names.
When I try to join in the domain, it said "A domain controller for the domain could not be contacted". I think that's why I cannot join the remote office PCs to main office domain where has one DC and DNS server.

I need a solution to solve this problem. Anyone got any ideas?

Thanks a lot
hhubboAsked:
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lrmooreCommented:
Try creating a little 2-line LMHOSTS file and put it on the remote network PC. This LMHOST file simply identifies the domain and the domain controller. Pay attention to all the details of the file requirements as laid out here:
How to Write an LMHOSTS File for Domain Validation and Other Name Resolution Issues
http://support.microsoft.com/support/kb/articles/Q180/0/94.ASP 

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dreamer7749Commented:
IT has relationship with what brand of firewall you used, some firewall could do it like sonicwall.
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jar3817Commented:
In Active Driectly clients find domain controllers (and other info) using DNS, and it sounds like your DNS setup isn't quite working. Try setting the dns server in all the workstations to the one dns server in the other location.  Once you are able to ping by DNS name you'll be able to join the domain.
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gbirkemeierCommented:
What side is the Domain Controller on?

In order to get the UNC naming to work you need to configure WINS servers on each network.  In your DHCP configuration on the remote router create an entry for the WINS server in the other network where the DC (WINS server) resides.

If the DC is on the 192.168.100 network, then configure the clients on the 192.168.200 network with the IP address of the WINS server (usually the DC) in the 192.168.100 network.

If you have a DC on both sides of the network you will want to configue WINS replication on each server that points to the other WINS server.192.168.100 <--> 192.168.200
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hhubboAuthor Commented:
I created a couple of entries in LMHOSTs file, so I can join in the remoted domain now. Thanks lrmoore.
Also I think if I setup WINS server which would be easier to handle all my pcs. Thanks gbirkemeier.
 
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