dns for internal machines

[Brian Bucher <babucher_(_at_)_alum_(_dot_)_mit_(_dot_)_edu>]

Greetings all,

I have DNS running on a server that tells the outside world
it's "external IP", and what I would like to do is have it
tell the internal network it's "internal IP" (192.168.0.1).

All the internal machines are windows machines.  Do I have
to run another instance of named?  If so, how do I make it
listen on a specific interface?

Thanks,
Brian