Network Service Order Causing Conflict with Private DNS on Local Network

I'm currently working on deploying a Snow Leopard Server-based setup for a university student-run television station, using a Mac mini Server. Because our university's own networking infrastructure is somewhat wonky and restrictive, I have recently networked our station's six other computers and the Mac mini Server together through wired Ethernet, using an AirPort Base Station as a router along with some D-Link Ethernet switches.
As a result, our computers are networked together on their own network completely independently from our university's network, but because this wired network has no internet access, all of our computers connect to our university's wi-fi network over AirPort for internet access.
I've set up Snow Leopard Server with a private DNS name "atvserver.private" and am intending to use this server internally for file sharing, directory services, and Wiki Server (and possibly Podcast Server). However, because of the service order in Network Preferences, if our client computers are set to give AirPort priority, then they can connect to the internet, but cannot connect to the server's private DNS. On the other hand, if our client computers are set to give Ethernet priority, they can connect to the server, but lose their internet connection.
The only solutions that I can think of are:
1) Bridge the university's internet connection on our private wired network (but the university will not allow us to do this because it violates their security policies), or
2) Come up with some way to bypass the networking service order so that "atvserver.private" goes to the Ethernet network, while everything else goes to the public internet over AirPort.
Any ideas on how to solve this problem?

What's the ip range an subnet for the university network
The issue has nothing to do with the IP addresses/subnets in use. It's about DNS resolution.
Fortunately the solution is simple.
Configure the DNS server on the SLS with the zone(s) for your private LAN.
Enable DNS forwarders with the IP addresses of your university's DNS servers.
Point your clients to your SLS for DNS service.
Now all DNS requests from these clients will go to your server. For zones this server is responsible for (i.e. your private LAN) the server will reply, for all other lookups it will refer to your university's DNS servers for resolution.
In this way your clients can resolve your private zones, the university's zones and public DNS hostnames. Problem solved

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