Q: I am tying to set up my time capsule I just purchaseed but the amber light flashes and I have an error stating "Double NAT". I have 2wire router (att uverse) for my internet. Can someone please help?

You simply need to bridge the TC..

In the v6 utility go to the network tab.. and select off bridge mode not dhcp and NAT.

Look at the more like this or do a search or the uverse as we have posted many many times the setup for this particular modem.

Double NAT is an indication that two devices are both trying to act as routers on a network. You only want one device....the 2-Wire.... acting as a router providing DHCP and NAT services. 

The other "router"....The TC....needs to be configured in Bridge Mode in order to turn off DHCP and NAT services on that device.

Open Macintosh HD > Applications > Utilities > AirPort Utility

Click on the TC icon, then click Edit

Click the Network tab at the top of the configuration page

Insure that the setting for Router Mode = Off (Bridge Mode)

Click Update to save the settings on the TC and wait for a green light

Then, power cycle the entire network by powering every device off in any order you choose

Wait a minute

Start the 2-Wire device first and let it run a full minute by itself

Start the TC next and let it run a full minute

Keep starting devices one at a time a minute apart until everything is powered back up

You should be all set

how do I make the time capsule wireless so it doesnt have to be connected to the 2wire att router with an ethernet cable?

If you check the Setup Manual for the Time Capsule, you will see that Apple does not support this type of connection for the Time Capsule. 

You will need to keep the wired Ethernet connection in place between the 2-Wire Router and the Time Capsule.

I was just having the same problem. But, if I understand you correctly, if I bridge the TC, I will not be getting any of the advantages of having the TC as a router? When the guy sold this to me instead of an external HD, the advantage was supposed to be that it would replace my 2wire with a better router as well as work as an external hard drive/backup. Now, as I understand it, I have to leave my 2wire in place, and i have to continue using it as my router too?

if I bridge the TC, I will not be getting any of the advantages of having the TC as a router?

That's correct.

the advantage was supposed to be that it would replace my 2wire

The 2-Wire device is a combination modem/router, or gateway type of device. The TC is a router only....it does not have a modem on board, so you will need to use the 2-Wire with the TC, or possibly replace the 2-Wire with a simple modem.....not a modem/router or gateway type of device.

If you keep the 2-Wire device and want the TC to act as a router, then the 2-Wire will need to be re-configured to function as a simple bridge mode modem. I don't know if that is even possible or not, but your Internet Service Provider (ISP) might be able to advise on that....if they provided the 2-Wire gateway.

Now, as I understand it, I have to leave my 2wire in place, and i have to continue using it as my router too?

That is likely the case, unless the 2-Wire can be re-configured as a simple bridge mode modem.....or....the 2-Wire device is replaced by a simple modem. 

Your ISP might offer a simple modem, so that may be worth checking out, as it would be much simpler than trying to completely reconfigure the 2-Wire device....even if it is possible.

I've got it up and running. Thanks, Bob. A little disappointing, but quality and useful info.

Thank you so much for this! I now have a green light too and it was such a simple solution   When its set up like this does it still help boost the bandwidth for wireless internet access?

When its set up like this does it still help boost the bandwidth for wireless internet access?

The bandwidth of your Internet connection is controlled by your service provider and the plan that you have in place. There is no way to "boost" the bandwidth unless you opt for a faster Interner connection plan with your provider.

Oops, sorry, yes, of course. I think I meant 'boost the wireless signal'.  I'd read a review (on Amazon) from someone that said the Time capsule boosted the signal around the house for them.

If the Time Capsule is configured to produce a wireless signal, then there will be more wireless coverage in the general area around the device.