OS X Server, Internal DNS and Apple Airport Extreme

OK,
There must be a way to do this. I cannot believe that this simplist of functions to a Wireless Router would have been missed off the new range of Airport devices.
I have an OS X Server, serving DNS internally and forwarding lookups to the Airport which forwards on externally.
Trouble is I want the Airport to connect to PPPoE and serve the guest network with DHCP and DNS but let my server do DNS on the internal network.
Why is there not a simple box in setup utility that says "use this DNS server on the local DHCP network" or something a long theose lines. It seems mad that Apple have overlooked this, I can only say I am missing something.
I have tried setting up a small range and putting in reservations but this limits your guest network to the same limited range so you end up with only room for two or three guests, this solution won't work for me.
It seems stupid to put the ApE into Bridge mode as I can then not have a guest network and I shouldn't have to have two boxes to acheive what I am looking for.
Rant over, any other help or solutions appreciated.
Regards to all
TMA.HA

@MrHoffman
Agreed, the Guest network will not have access to the local range. I missed that part.
In my setup, the second DNS is google server because i don't want the internet to stop working if the local server is not operational, this way at least Internet will be available.
- Client contacts Primary DNS, If it fails to reach it, it will go to the secondary. Well, to be more accurate, the OS will choose the fastest DNS server it can reach first. Ideally that would be the local server.
In a normal day when everyting is up and running:
- Client contacts the Primary DNS (OSX Server DNS), if the query is a local DNS record , it will serve the IP.
- If the query is not a local record, it will send it to the forwarder DNS server defined in the DNS service (ISP DNS or Google DNS)
For the guest network, It would be worth checking to do the following:
- Add a second Wifi network interface on the server and connect it to the guest network IP address.
- On the AirPort Extreme, put the Guest network IP address of the OSX Server in the secondary DNS field.
In this case the guest clients will always try to reach the local network DNS first and then failover to the guest network IP of the DNS server.
@piperspace
Well, a home router is already working as a local DNS server that tries to resolve locally then forwards to an external DNS server when it cannot resolve the name.
Primary and secondary in an enterprise space will surely be a main and a backup and both contain the same name spaces. But the point here was about home use and therefore the purpose will be a backup DNS server for the internet at least.

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* need to edit to" trying to get my iPhone not iPhoto**"

OS X Server, Internal DNS and Apple Airport Extreme

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