How do I put wireless machines onto a subnet?

This thread is also in "Networking -> Windows 2000 networking".

I ran into the following problem when I tried to add wireless machines to an
existing subnet.

Setup:
Windows 2003 server with 2 NICs, one is connected to "network A" (obtains IP
from a DHCP server), one is connected to an AP. It's also a wireless RADIUS
server (IAS).

I want to add all machines on the AP side to "network A". The problem I have
now is that if I bridge these 2 NICs, I won't be able to do 802.1x auth,
because the AP needs to know the IP of the IAS, but the IP is dynamic
(obtained from DHCP server in networkA).

Is there another way to do this? Thanks.