This works but should it?

[philwhite100]

I have a wireless router upstairs to which it is connected to the cable modem.
All 4 ethernet ports are used on the router, one of which is connected to an additional wireless routers WAN port. the additional wireless router, a Belkin N1 Vision shows it is connected to the internet on it's display.

This set up seems to work just fine, sort of a wireless repeater.
I might try a different SSID and passkey on each router and see if my wireless devices detect either.

[Kymmy]

All you're doing is double NAT'ing it will may cause problems with games and other applications that need specific ports and it will be slower..

[qasdfdsaq]

It should work, and yes, it's likely to have lower performance and other drawbacks.