Quote Originally Posted by tritch View Post
Assuming your modem is bridged, there's only one IP change from your public IP through your DHCP router to ATA ......thus single NAT.

If your ATA is attached directly to a bridged modem, there's no NAT at all since the ATA is seeing your public IP. Only the device's attached to the LAN port of the RT31P2 experience NAT.

My apologies, it looks like there is less than 4 NAT's since you turned off the DHCP server in the RT31P2. I'd have to study your setup a little closer to get a better idea of how many NAT's are going on.

There's still a problem somewhere in your setup if you are having to go to this trouble.
Having the ATA directly attached to the modem is a no-go. The RT is an insecure device - it's firewall, in a single word, sucks. When I had it directly connected, a run of ShieldsUp at grc.com showed ports were closed, not stealth. And a few ports were open.

Having the ATA behind the WRT caused reauth issues when the WRT was directly connected to the WAN port of the RT.

Which brings me to the topology in the first post of this thread.

-Craig