Router cannot connect to Internet

I am having trouble setting up my router to connect to the Internet. I am currently renting a basement unit and I have an Ethernet port running upstairs to the owner's floor. I have verified that port is active by plugging my desktop into that port and being able to access the Internet. I have also verified that all the Ethernet cables are working.

I have a Linksys WRT54GL flashed with Tomato 1.28. The 'Internet' light on my router is lit up, and the Tomato 'Status Overview WAN Gateway' IP address is I have currently tried plugging my computer's ethernet cable to the back of the router, and connecting my phone to my router's WiFi.

Is there anything further I can do to debug why my router cannot connect to the Internet?

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