No authoritative and authoritative replies for the same zone.

[Olivier.Khazem at equant.com]

Hello
We use ISC Bind 9.2.3rc1 for Window NT/2000
This is for use of a platform that have access to two type of networks:
        - Internet;
        - private world.

We have a domain name example.com for which we want
some hosts to be 
searched by ISC Bind as no authoritative replies
(Internet replies)

some other hosts to be
searched by ISC Bind as authoritative replies
(in order to get the private network area)

How to do that?

In avdance, many thanks
Olivier