airport doesn't work with comcast

[pspiegel]

Hello,

I just moved houses and stayed using the same internet provider (comcast high speed internet cable modem). I went to the new house and plugged in my macbook pro and it got on to the internet no problem using DHCP and an ethernet connection. Now I went to set up my airport extreme, and I set it using DHCP and tried to connect, and it just sits there when it tries to access a page. I was using in my old house an airport extreme linked to another using WDS so I could extend the range and it worked no problem. I tried on both of them just using DHCP and it doesn't seem to work. I tried doing a hard reset on one and setting it up using the assistant, and still no luck. I even programmed in the values that I get when I use my ethernet connection as a manual setting in the airport, and still no good.

Any ideas/thoughts would be appreciated, I am stumped as I figured DCHP should just work with the airport.. I do not use any domains/other routers yet, and I don't see what the problem should be. I am even getting the same issue when I did this with a linksys router. Is there something I can do to get this to work on the MacBook Pro/a preference to trash?

Thanks so much for your help in advance!