I did goto the Cisco site and download the manual and it says that the default
password is "admin". However that doesn't work and the other permutations don't
work either.

I think that the "no wireless extensions" output means that I don't have a
driver installed for the WRT310N.

I've downloaded a .bin file from Cisco and I've may have installed ndswrapper,
not sure, but maybe I need a driver installed first.