It depends. Generally a W2K vpn server is connected to the internet with one nic, and
another nic connected to the internal lan. However if you are using nat/pat at the
router then you can forward vpn ports/protocols to an internal address vpn server -
typically port 1723 and protocol 47 since l2tp can not use normal nat. The domain
controllers do not have to be vpn servers themselves [and not recommended anyhow] and
would access each other through the vpn. A better solution if possible would be to
use ipsec vpn tunneling, but your routers facing the internet would need to support
it. If you are interested in such a setup, I would recommend that you post specifics
on the win2000.active_directory newsgroup as you might need to configure sites,
c. --- Steve