[Alug] And now a DNS question....

Hi again.... Just been asked at work if it's possible to setup the DNS server (Bind9 RH6.2), to not only resolve addresses on the public side, but for internal users on a private IP range to have say www.domain.com resolved to a private IP if it's on the internal network.. That's not too clear is it... e.g. www.domain.com normally resolves to a public IP want internal users to resolve it to a private IP... Is this done using acl's ? TIA Simon P.S. Sorry if it's still not that clear...