How-To Set Up with Uverse Gateway with Airport Extreme

I just spent hours figuring this out so I thought it would be helpful to someone. Maybe, maybe not. My goal was to get Back to My Mac turned on...but this should also be how you set up your wireless network if you have both an Airport Extreme and a Uverse Gateway.
As I was trying to setup BTMM, I got a "double NAT" error. To use BTMM, you have to use either Time Capsule or Airport Extreme, so that NAT has to be enabled. That meant I had to figure out how to turn off U-verse's. I looked through the settings but saw nothing about it. Several hours of research--and a useless support call to AT&T--I finally figured it out. Here's the configuration you need, in brief.
On the Airport Extreme, under Internet > Internet Connections, Connection Sharing must be set to "Share a public IP address". Then under the NAT button, Enable NAT Port Mapping Protocol must be checked.
Now, unless you doe rest of this configuration, you will get a double DHCP error. So, in the Uverse Gateway settings, you must do this:
1. Under Wireless, click the option to DISABLE wireless. Click Save.
2. Under Firewall, click the option with DMZ in the name. On this page, choose your Airport Extreme (whatever you named it). Then scroll down and choose the option that says "Allow All Applications (DMZPlus Mode)". Save that configuration. DO A HARD RESET ON THE AIRPORT EXTREME. Then that should enable a single NAT protocol and BTMM will be on its way. And your wireless network will be set up properly.

Will the above method work on a set up with a Verizon Modem to a DLink wireless router to a Time Capsule?
I know of no reason why it would not. Whenever there is another router ahead of the Time Capsule, the Time Capsule must be configured in Briddge Mode. My network has 4 routers. The "main" router is setup to handle DHCP and NAT and the other 3 routers are setup in Bridge Mode. No problems.
Weird thing is Air Video set up tells me I have a double NAT
Double NAT occurs when you have two routers on a network both set up to handle DHCP and NAT services. Your Verizon "modem" may be a gateway....a combination modem/router on the same chassis. If that's the case, then every other router on the network must be confgured as a "Bridge".
If you have the "main" router on the network setup to handle DHCP and NAT, in theory, you can have multiple other routers on the network as long as they are all setup in Bridge Mode. In Bridge Mode, DHCP and NAT are turned off, so the other routers simply pass through the network information from the main router. It's by far the easiest way to configure multiple routers without having to go into special DMZ, port mapping, etc type of configurations.

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