Uverse - Airport Extreme and MacBook Pro assigned same IP address

Ok, so I have a Uverse RG -> Airport Extreme -> bunch of computers. For some reason, everytime my MacBook Pro sleeps and then I wake it up, it says it can't connect to the internet because there is another device with the same IP address. None of my other Macs (iMac, Powerbook, iPad, iPhones) ever exhibit this behavior. I'm not sure what's going on here. It's almost like the AE takes on the IP address of the MacBook Pro every time it sleeps (or maybe its the other way around). If I go to advanced settings on my MBP and try and renew the DHCP lease, it won't renew and continues to give me the same error message. If I log on to the AE and renew the DHCP lease, it comes back just perfect. This has to be an issue with my RG since it's assigning the IP addresses right? I tried manually setting the IP address of my AE. That seemed to fix it for awhile, but then the MBP again started reporting the same IP address as another device on the network. I didn't discover which device it was, but I did determine it was not the AE since it was configured with a manual IP address. This is getting pretty frustrating as I have to log on to the AE and reset the DHCP lease every time I leave and come back to my MBP. Anyone have any ideas what could be causing this?

I had the same problem with an Airport-enabled iMac.
Here's what I did that fixed the problem:
Log into the Uverse Admin Tool through your browser.
Click on the Settings tab.
Click on the LAN link in the grey bar
Click the circle in front of "Configure Manually"
Set the "Router Address" to 192.168.1.254
Set "Subnet Mask" to 255.255.255.0
Set "First DHCP Address" to 192.168.1.100
Set "Last DHCP Address" to 192.168.1.199
Click the "Save" button. (You'll probably have to enter your password.)
Now open the Airport Utility.
Choose your Airport Express on the left and click the "Manual Setup" button.
Click the "Internet" icon in the top bar.
Click on "TCP/IP"
Select "Manually"
Set "IP Address" to 192.168.1.42
Set "Subnet Mask" to 255.255.255.0
Set "Router Address" to "192.168.1.254"
Set "DNS Server" to "192.168.1.254"
Click the "Update" button.
This sets your Uverse router, which is handing out the IPs, to only give IPs out that number between 100 and 199. It reserves the rest for you to enter manually. So your laptop, your iPhone, etc, will get the DHCP addresses between 100 and 199 but your Airport Express will *always* have 42.
You may have to reboot everything to make sure each device gets the new IPs.
Also, there is no significance to the 42 number. It can be anything between 1 and 99.

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Select TC on left.
Click "Manual Setup".
Select "Internet" from the toolbar above.
What's listed for "DNS Server(s):"?
Try putting in these servers from OpenDNS
208.67.222.222
208.67.220.220
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Next, launch System Prefs --> Network Prefs.
Select the service you usually connect with on the left (Airport or Ethernet).
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Nevertheless, it doesn't hurt to add the DNS servers noted above here as well.
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Re: Airport Extreme IP Address Issue
After hours of trying everything else, this worked!!!
From: Comcast Networking/Router/Wifi Gateway:
Re: Airport Extreme IP Address Issue
11-20-2012 07:11 PM
MyComputerGuyJo:
I just wanted to add what Apple Support walked me through. Worked perfectly. Similar to some of the posts here. This assumes you have finished the setup of the Airport using DHCP to obtain the IP automatically from Comcast and it says the IP is invalid.
Power off\on Sequence
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Re: Airport Extreme IP Address Issue
11-01-2012 03:07 PM
Freyfisher: I had the same problem whenn I switched to the Airport Extreme yesterday. Here is what I did:
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CoreWLAN:          2.1.2 (212.2)
CoreWLANKit:          1.0.3 (103.2)
Menu Extra:          7.1 (710.1)
configd plug-in:          7.2.1 (721.3)
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Supported Channels:          1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 149, 153, 157, 161, 165
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Uverse - Airport Extreme and MacBook Pro assigned same IP address

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