DNS required for NAT and DHCP services?

I have a 10.6.2 server with a static IP, domain name, working as a gateway (I have my reasons) as well as providing some services inside and outside. My ISP has a PTR setup so the domain points to the static IP.
My question is, do I need the DNS service running on the server? Based on some of the docs it tells me to put my ISPs DNS servers in both of my servers ethernet port settings, as well as in the DHCP profile to give out to clients on the network. When I do this, clients cannot resolve names. I can ping IPs from the client, I can even ping my ISPs DNS servers from clients, but I can't resolve names. When I try to dig anything it just hangs there with a blinky cursor.
When I have the DNS service running it's all happy. The only thing is, clients on the LAN experience some serious lag when accessing services on the server, UNLESS I configure the DNS for my domain on the server with both internal and external IP addresses. Is that how it is supposed to be?

In the server zone files, the dedicated IP address should point to the machine name, as in name.someserver.com. The local IP address should point to name.local. If you have more than one domain name, the zone files should show their network IP address, not the dedicated IP address, which should only point to the machine name.
As a side note, I strongly advise against connecting a server directly to the Internet. It should be behind a router with DMZ/NAT/firewall capabilities. By the time you realize why, it will be too late.

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DNS required for NAT and DHCP services?

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