Why (out of the blue) airport extreme can't connect to the internet?

Suddenly the airport extreme on my macbook pro (10.6.8) decided to completely stop working. the modem/router work fine as i tested them with another computer and i've brought my macbook to another house and tested it there and the same thing happens.  if i'm hardwired via ethernet cable the internet works like normal. which is what i'm doing now.
the wireless icon on the top of the screen shows full strength and when i click on it it shows my network with a check mark next to it but if i try to open a browser window it won't work. opening network preferences shows that airport is not connected and it does not have an IP address and can't connect to the internet. if i open airport utility (5.6.1) it says "airport utility unable to find any airport wireless devices".
everything was working fine a few days ago.
what's going on?

The same thing happened to me, and I took it to get looked at and they even replaced my base station, but then it kept disconnecting. I finally  found the answer that solved my problem, but now I can't find the post that solved it to direct you toward. So I'll try to re-create it as best as I can.
Like that user, I have Xfinity. The other user had received this assistance from Comcast tech support (Which is sad that Comcast was more helpful than ... anyone ... but especially Apple), so if it doesn't work they should be able to help fill the gaps. Chances are, you may be better off getting assistance from your ISP than from Apple.
Basically, Comcast switched over to IPv6, and it needs to be accounted for or else the AEBS will drop the signal from the DSL modem.
1. Open Airport Utility
2. Click Edit on your AEBS icon.
3. Click the Internet tab.
4. Click Internet Options.
5. Make sure IPv6 Mode is set to "Tunnel."
6. Click the "Enable IPv6 Connection Sharing" radio button so that it's active.
7. Save changes, Update the new settings, and let the AEBS restart with the new changes.
I fixed it a couple of days ago, and it's worked perfectly since then.
Here's the post that fixed it. https://discussions.apple.com/message/21916742#21916742
Here's the Comcast information the post refers to. http://www.comcast6.net/index.php/6to4config#faq3
Message was edited by: Crimsondude

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