Mixed DNS servers

[Neil Núñez]

I have a mixed dns enviroment, the external server and the internal servers.

At the external servers I run bind 4.9 (on an AIX 4.3.1) and at the internal servers I run 
NT 4.0 DNS service with DHCP and Wins.

Question:
1.- How I configure the bind 4.9 (on an AIX 4.3.1) to resolve the internal queries only to
my network?

I don't want to disble DHCP with WINS.

Thanks in advanced,

Neil
nnunez at espol.edu.ec