different external and internal addresses

[Joseph Shraibman]

I want to have different ip addresses for a lookup based on where the 
query comes from.  For example www.tupari.net should be 66.166.198.124 
to the outside world but 192.168.0.2 to the internal one.  While the 
bind admin guide shows how to restrict certain zones based on ip, that 
isn't what I want to do.  So how do I do this while running one bind?