Why did I have to enter IP address manually

I could use a little help. I have an Airport Extreme 802.11n and a Motorola modem for connecting to Comcast. I also have two Macs and an iPhone.
All of this was working fine up until very early this morning. And then it just stopped working. After trying everything else I could think of, I finally connected my MacBook Pro directly to the modem using an Ethernet cable. And that worked fine. But I noticed that the "automated" Comcast DHCP information was different than the supposedly automated data on my Airport Extreme.
So I reconnected my Airport Extreme router and entered the information manually under the "Internet" tab. This information I entered includes:
- IP Address
- Subnet Mask
- Router Address
- and DNS addresses
But I'm puzzled. Why did my Airport Extreme not obtain and use the proper Comcast addresses when I had it set to "Configure IPv4: Using DHCP" … even when I powered down both the modem and the router, and restarted???
Can anyone suggest a fix for my problem?
Thanks,
-AstraPoint

William:
Thanks for your interest in this. Here are some more details. When my Internet connection stopped working yesterday I reviewed my Airport Extreme (Gigabit) "Internet" settings using the Airport Utility. Everything looked OK. I was using "Configure IPv4 Using DCHP." The AE had a green light, and the various settings from Comcast were all populated ... and I noticed that all of the Comcast IP addresses (including the router and DNS servers all started with "68."
Then I disconnected my AE unit from the Motorola modem, and connected my MacBook Pro directly to the modem using Ethernet. And it worked! I could access the Internet. I then looked at my MBP "Internet" settings in the Network section of System Prefs. Again I was using "Configure IPv4 Using DCHP," but I noticed that the IP addresses being served up by Comcast were different. Both my IP address and the Comcast Router address started with "71." (and not "68.").
So I copied all of the TCP/IP settings from the Network Prefs panel on my MacBook Pro, and entered them manually into my AE. And then my Internet connection worked just fine. It's still working some 20 hours later, and I'm still using the manual TCP/IP setup on my AE.
But I'm concerned that my AE was not picking up the correct TCP/IP settings from Comcast via DHCP. I would like to go back to using DHCP, but I would like to know what went wrong yesterday before I do.
Regards,
-AstraPoint

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