W2k3 servers on domain with firewall appliance

With a firewall appliance, must Domain controllers and file servers have two IP addresses in order to be available from two offices?  A domain is shared between two locations.  Routers are mapped to resolve server ip addresses.  Once a firewall appliance is in place, and private ip addresses are issued for local machines, will servers require two IP addresses -- the public and private ip address so the other office will still have access?
We want to use 172.x.x.x for internal servers and workstations but resources on servers are shared between offices using 156.x.x.x
gtownladytnAsked:
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netjgrnautCommented:
In general, no - you should not need two IP addresses on the servers.  After you re-IP the two sites, you could (should?) establish a site-to-site VPN between either the two firewalls (if they support it) or two other servers (you can use the DCs if necessary).

More detail about your network design would be helpful...

I'm not sure I understand what you mean by...
Routers are mapped to resolve server ip addresses.

Just to be clear, are you saying you have your DCs connected directly to the Internet?  Or is the "156.x.x.x" network you allude to a private leased line/frame relay/other non-Internet connection?

If you've got two sites, aren't you getting *two* firewalls?
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