Lion Server - NAT destroying DHCP

Hi,

I have recently purchased a USB Ethernet adapter so I can setup NAT on lion server that runs on a MacBook. I was shocked when it blew away my DHCP Config after I set up NAT, but I stuck with the scope it chose and added the correct DNS and gateway settings.

Whenever I start DHCP now, the logs tell me the Config cannot be found, and it blows away all of my modifications to DHCP. On top of that, it won't hand out any addresses.

Now it gets weird... If I stop DHCP, the system logs start telling me that "natpmpd" has started, and then it begins to hand out addresses. The problem with this is, I can't make any changes to the DHCP settings it uses, which means my clients are now getting the incorrect settings for the gateway and DNS...

Also, when I modify the Scope with DHCP stopped, the logs tell me it cant update the subnet because it was not found.

Has anyone seen this before?