My home network is currently a single subnet, and I'd like to segment off some of the traffic. In a nutshell I have:

ISP device (modem/router/firewall/switch) <-> Airport Extreme 802.11n <-> wired and wireless devices

I'd like to have (again, in a nutshell):

ISP device <-> AEX <-> wireless traffic (subnet A)

ISP device <-> wired traffic (VoIP modem/router) (subnet B)

I've played around with the AEX, but it gets unhappy when I point it to a router that is on a different subnet. I have a few extra routers sitting around that could be deployed it needed.

Any thoughts here?