You might also try reprogramming the router to act as a
wireless access point instead, which typically involves
disabling DHCP. As long as you don't already have a DHCP
server running on your network, you might have the Linksys
hand out ip addresses. I think you'll have to plug the
ethernet cable into a LAN port if you assign the Linksys
a 10.0.1.0/24 address. There's tutorials available online
for such reprogramming.