[linsomniac]

FYI: You can do this on the small scale using ProxyARP. I did this once on a network interface connected to the DSL modem, and then proxy ARPed between that interface and another DMZ interface, and it worked just fine. For the router, I set up an ARP on the DMZ interface with that interface's MAC for the router IP, and for each machine in the DMZ I set up the DSL network's MAC with the systems IPs. So each side would see the routers MAC when doing ARP, but when the router received it it would know to send it on to the other interface.

Bridging works great, but it's kind of fun to see this at the proxy ARP level.