One of my son's roommates contributed a Linksys WRT54G from her parent's home to their apartment but they couldn't get it to work. Trying to help them, I reset the router, configured WEP 128-bit encryption, and got two of their laptops to access the router just fine. However, while they could ping the router just fine, they can't get to the Internet. I've confirmed that the internet is available directly from the modem.
Any ideas why they can't get out to the open Internet?