selective forwarding and firewalls

[Alain Morency]

Hi,

We have two different internal networks separated by firewalls and we want 
to
resolve betwen them. One is for production and the other for development so
we want to limit as possible the interaction between them.
How can we do it if :
     -  They have completely different namespaces.
     -  They are autoritative only for their own namespace.
     -   We only permit dns query in the firewalls
     -   Each network has a primary and a secondary dns with global 
forwarding
         to a dns who has access to the internet.
     -   We don't want, if possible, to do zone transfer between the two 
networks or
         put the db files of the other network on each dns.

We tried using selective forwarding but it didn't work as we expect.
Should we use an internal root server ?

Thank you,

Allan

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