Ive been having real issues with the linksys WAG54GS routers. Every time i set one up i seem to have real problems with them. I lost my rag today when i couldnt get one to dish out Dynamic IPs over wireless. The linksys guy on the phone sent me to the link below, will report back on the Friday if it works (will be heading back to do the update then), but i figure you people may like the link if you havent got it.
Full set of Beta Firmwares for Linksys and Kiss gear:
http://www.linksysdata.com/betafiles/
usernames is "linksys" password is "beta76".
usual rules to using beta software apply, use at your peril.
just flashed a WAG54GS with the 1.0.0.9 firmware. no more features, but the little bugger started working straight away.
Proceedure is flash the firmware in, then use the "set to factory defaults" option in the control panel. Not the button on the back, use the option built into the firmware.