Airport Extreme wired network can't assign IP address, but wireless works
*Problem details:*
We have three computers intermittently on, wired into the ethernet LAN managed by the Airport Extreme.
We have a few more computers that connect to the wireless network managed by the same Airport Extreme.
As far as I know, no fancy settings hijinks have been attempted. I manage the router, and I only plugged the Airport into the cable modem and connected all the wires to the computers. The WiFi setup went a similar way -- I just turned it on and it sorted itself out. This was eight months ago, mind you -- everything has been going quite well up until this weekend.
But! I got home from a trip this weekend to discover that all the machines that connected over the wired network could no longer get a connection to the internet. Any machine connected over the wireless network, however, was working just fine. Indeed, my macbook pros couldn't even see the Airport Extreme when I turned off their WiFi, connected them over Ethernet and opened the Airport Extreme configuration app!
The wired machines complain that they have a self-assigned IP address. Sometimes, after resetting everything, they look like everything's fine for a moment. Like I said, ordinarily my macbook pro does not even recognize the router over the wired network. However, after reverting to factory defaults and restarting the Airport, the laptop did see it (until a few minutes went by and it realized something was wrong).
I figured that renewing my DHCP lease would fix this problem, but it did not. Nor did turning off Passive FTP Mode (PASV) under Proxies in the Network configuration pane.
I have tried resetting the router to factory defaults, power cycling the modem and router in various configurations, etc. but nothing has worked. In addition, I have verified that connecting any machine to the ethernet directly from the modem will work, so the problem is definitely being introduced by the Airport Extreme.
So I guess my question is: what do I have to poke to return everything to normal? I'd like working wired and wireless networks again.
*Some last few details:*
The Airport is running 7.5.2, but downgrading to 7.4.2 produced no tangible difference.
I have an Ubee D3.0 modem. All lights are green and blinky except the DS light, which is solid amber (and it is green when the modem is wired directly to one of my computers -- it's only amber when connected to the Airport).
Some of the machines that can't connect to the wired network are PCs, so it's not just an OSX thing.
My roommate's XBOX 360 can connect to the internet over the wired port. It doesn't have WiFi, so I'm pretty sure there's no way it could be fooling me.
Thanks in advance for any advice you can muster.
EDIT FOR APOLOGIES:
I didn't realize I was posting this in the "Airport for Windows" section. While a Windows computer's connection is a concern, I would much rather get my Macs online and deal with that first. I can't figure out how to move the message myself.
*An update:*
Several days later, this issue seems to have fixed itself. I suspect there may have been Funny Business on my ISP's end (but then again, it's an ISP).
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