Configure DNS on Snow Leopard for private NAT with Open Directory

I am needing to set up DNS on Snow Leopard server 10.6.4 for use with Snow Leopard clients only. On the server, I have two IPs, one public connections outside the network, and one private within the NAT range. DNS was not originally set up on the server, but Open Directory was (sort of). I've demoted the server from OD master to stand alone, but still can't get this to work.
This server is only for setting up and using Open Directory + NetInstall services inside the network. In effect, it isn't serving web pages and isn't registered with our upstream DNS. What I am assigned to do is get Open Directory to set up user profiles and network shares and home directories. So, what I need is this -
a basic DNS config I can do in Server Admin that will set up DNS to resolve to the local server NAT IP for Open Directory purposes;
and provide DNS for outside the OS X server for the specified Snow Leopard clients.
DHCP is running (but the clients were configured with static IPs in the NAT range). This serves as the DHCP server for the entire network (Windows + Mac clients that aren't in the static NAT range).

Thanks for your replies. I realize I'm not making clear the way this network is configured . Also, the only services running on the Snow Leopard server are (at this time):
dhcpd - in the 10.136.31.x range;
dns - same as before;
planned to add are:
Open Directory (for network logins)
Software update;
Web (only on the 10.136.31.x Ethernet);
mySQL (localhost only - for moodle);
NAT is not set up on the Snow Leopard server itself. We have an outside router, a Cisco 2811. This router provides routing for both the public IP range, and the NAT range is configured in this router. The forwarding dns is located in LR and Fayetteville. So what I need is dns on Snow Leopard to forward outside queries to the state DNS servers, and resolve the local NAT IP only for Open Directory and a set of Snow Leopard clients.
Is this going to be possible?

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