Unable to connect to router admin panel at 192.168.1.1

Hi, I just got back from being gone for a couple weeks and my router stopped working. I tried to reset the router and connect to the admin screen at 192.168.1.1, but it gives a "page not found" error. My internet work with a wired connection to the router, and the computer's IP address is 66.xxx.xxx.xxx. Looking at most forums which talk about this problem it seems like most people have IP addresses starting with 192. Why does mine start with 66? Is this related to the problem of being unable to access the admin screen? This is a home network and I'm running Ubuntu and have a Linksys WRT54G router. I get the same IP address whether I connect just from the modem to the PC, or from modem to router to PC. Anyone have any ideas what I should do?