Wireless DHCP on SBS twin homed system

Hi

I have a sbs2003 sp1 server, and a draytek 2800 wireless router.

I can connect successfully to the wireless router, as seen in the station list as connected, whoever i am not getting a dhcp assign IP address to the wireless client.

I have setup dhcp on the server to accept requests from both networks 192.168.16.0 and 192.168.1.0
the first is the server network, and the second is the WAN facing NIC

Any ideas apart from removing the second Nic would be helpfull