Current model Airport Extreme no longer accepting DHCP WAN assignment

I woke up to my airport extreme not connecting to my ISP.
I'm using DHCP on the WAN side, and my Airport can no longer retrieve a DHCP address.  It appears the Airport does find the ISP's router address (the router address and subnet mask are populated), and my ISP sees the DHCP request.  However, my Airport will not accept the DHCP response and assign the address.  (My Internet connection is over a fiber line and I use a "portal" for access.  As such the ISP can see any and all packets for troubleshooting.)
I purchased my Airport new in November, 2011.
If I connect my Macbook Pro directly to the portal, I get a new address off the ISP.
My ISP then created a DHCP reservation.  Still no luck.  I then tried assigning a static address.  That works as well.
So it seems my router is not accepting the DCHP response or assigning the address.  My ISP uses DHCP3 on Linux.
Any ideas?

So it seems my router is not accepting the DCHP response or assigning the address.  My ISP uses DHCP3 on Linux.
I'm not aware of any incompatibilities with version 3 of the DHCP service that would cause your AirPort not to accept an IP address from your ISP ... although anything is possible. Is this something that your ISP has just updated their DHCP services to or has this been their configuration for a while?

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    JTelcontar wrote:
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