AirPort Extreme can't find Comcast DNS Server

I have a relatively new AirPort Extreme Base Station router purchased from BestBuy in 4/2014 along with a new Motorola modem receiving Comcast Blast! internet service (because I have no other option as a San Francisco resident).  I am running OSX 10.9.4 on a MBP retina but this problem affects all devices on the network, hard-wired and wireless.
My internet has been working fine since initially configuring the router and modem but the other night the internet simply stopped.
A full reset of the modem, router in the proper order, while waiting an appropriate amount of time to release the IP returns me to the same "disconnected" state (see attachment).
Since the internet is able to be obtained by connecting directly to the modem, Comcast blames the router, refuses further support and suggests calling Apple.
The Airport Extreme appears to be in perfect working order and I tried restore it to factory setting several times to no avail.  The peculiar thing is that occasionally following a restart via the menu in AirPort Utility, the internet briefly becomes available and then disconnects.
This has been on of the most frustrating consumer experiences I have ever had on many levels mostly because after several days, I still am at a loss for a viable solution which is compounded by the fact that I am a computer scientist working in tech, not a helpless, technology-illiterate person.
I do not know enough about DNS Servers to pinpoint why the server appears to refuse internet when it notices the router.
Are there any configuration settings I can try on the advanced dialogs (ie switching from NAT/DHCP to only DHCP)?
Please help.  I still have no internet.

There is a bad bug with some Motorola modems with the ethernet on the WAN port.
It is simply not connecting properly. What modem is it??
It is not uniform.. but it happens to a large enough number of people that there is a fair number of threads about modem issues and the newer airports.
Please do a search yourself here for experience with your particular model.
But you have blotted out the very info I need to help you.
I need to see IP address and DNS.. if you are on dynamic IP it makes no difference to post it.. you will have a new IP tomorrow.
I have suggested a work around in using a crossover cable or a small 10/100 switch between the modem and the airport.. it helps for some.
There is also some more info you can get using the natutil command from terminal.. particularly it will show the WAN link speed.. which I want to force down to 100mbit.
Terminal command to check Apple router status. natutil
No luck return the airport to apple for checking / replacement.. or bridge it and buy another router.. this isn't hard and Apple will doubtless produce a new firmware that might fix it if it isn't some nasty hardware thing.

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