HT2497 Why does my Airport Utility keep saying "Double NAT"error?

I had to add a new cable modem to my home network.
I keep getting a "Double NAT" error and my modem keeps the yellow light blinking.
What do I do?

It's almost a miracle that it was working at all.
Each wall will absorb on average, about 15-20% of the signal so after 4 walls...and a ceiling....which is typically 2-3 time thicker than a wall....there isn't going to much signal left to extend.
Try locating the Express no more than half the distance between the Time Capsule and the general area upstairs that needs more wireless coverage. Minimize obstructions in the signal path as much as possible.
If that does not help, we'll have to do some SNR measurements to see if what you are trying to do is even feasible.

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The utility has had less and less useful information .. it might be time to simply find a different utility.
Fing network scanner. iphone and ipad.
https://itunes.apple.com/au/app/fing-network-scanner/id430921107?mt=8
This is very popular.. I do not know of what works well on Mac OS because i have installed 5.6 utility which of course has far more info than the later toy version. Plus using an Asus router which has excellent listing of all the clients.
Sometimes beating yourself up to make apple routers do what you want is easier solved with lateral thinking.

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bmarr

I read the Apple article on how to configure an extended network. Unfortunately my Airport Utility seems to have none of the functionality mentioned in the article.
The article was written a few years ago and Lion 10.7.4 was not around at the time.
I suggest that you download and install the full featured version of AirPort Utility 5.6 for Mac OS X Lion . I think you will find that it will track with the article (if it is the one that I think it is) very nicely.
You can keep both AirPort Utility 5.6 and AirPort Utility 6.0 on your Mac.

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It's almost a miracle that it was working at all.
Each wall will absorb on average, about 15-20% of the signal so after 4 walls...and a ceiling....which is typically 2-3 time thicker than a wall....there isn't going to much signal left to extend.
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HT2497 Why does my Airport Utility keep saying "Double NAT"error?

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