bind and dns forwarding

[tanzer.genc at gmail.com]

Hello all,
I have 2 bind dns servers in my company. One of them (dns1)for internet
and other one (dns2) for WAN requests. My all clients and servers's dns
settings; first dns dns2 and second dns dns1.
I am looking from my firewall, my local dns is asking dns requests to
internet dns servers. I do not want to give access for my local dns for
dns requests from internet.
How can i configure my local dns for ask all of the dns requests only
to my own internet dns?

Thanks and best regards
Tanzer GENC