AirPort no longer working with Comcast

I have had my Airport Extreme, working great with my cable modem for the last year, but a few night ago it decided to stop working. I get a error that it can not get a IP address.
If I wire direct from the cable to my imac the cable works fine.
If I go from cable to Airport I can not connect to the cable via Wifi.
I have reset the Airport, etc. and it still does not work.
Any ideas on how to get this going would be great.
Thanks

Joe,
There were a couple of things that lead me to fixing it.
First, I did call comcast, because it did appear that they were blocking systems coming off the wifi. The stated they do not do this, but I have a feeling they may have reset something after talking to them, because information started to propagate to the search domains field.
Second, I connected directly to the cable box with my imac, and got the correct DNS Server names. I did a hard reset on the wifi and unplugged the cable and wifi box.
On setup my first DNS server address we my incorrect on so I was able to put the correct one in.
The grayed out one for me was correct.
I hope something in there help you out.

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