Need some advise!

[Adil Tahiri]

Hi guys
We have a private IP network connected to the outside world using NAT.
Currently we have an external dns server outside the firewall) acting as
primary for our zones, the problem is we want to resolve internal names as
well as external.
Which approach would be better in this instance ?
1.Install an internal dns server and make it forward all unresolved queries
to the external DNS.
2.Use the external dns server for everything.
Any other way of achieving this ?
Your help is really appreciated