Setup for primary/Secondary name servers

[Mohamed Navas V]

Hi,
We have to setup two primary servers for the subdomain
''abc.example.com'' residing inside firewall and protected from
Internet. Two secondary servers will be placing in DMZ.. These servers
are resolving external internet users to some internal machines. The
primary servers are supposed to be for the internal DNS, but some of
the hosts have to access from the internet.

We are supposed to provide a forwarder for handling internal name
server queries for Internet domain names

Pls advice me with suitable guidelines for the above setup.

thanks,

Navas.