Putting the 2Wire 3801HGV (AT&T UVerse) Residential Gateway (RG) into Bridge (Passthrough) Mode
If you have a NAT enabled router or firewall behind a 2Wire 3801HGV, and you want your router/firewall to have a public IP address, then this is how you can enable Bridge mode (aka Passthrough mode):
Disclaimer: I am not an expert on either UVerse Internet service or 2Wire routers or residential gateways. I just bungled my way through figuring this out, and documented what I did in hopes of saving someone else some time (or myself, if I ever have to do a reset on my Residential Gateway!)
Log into the UVerse Residential Gateway (http://192.168.1.254) using the system password from the sticker on the side of your UVerse gateway.
Click Settings, then Event Notifications
Check the box labeled "Router behind Router"
At this point, your router/firewall should be connected behind the UVerse Gateway:
Client PC <===> Your Router/Firewall <===> UVerse Residential Gateway <===> Internet
From behind your router (which should, in turn, be behind the UVerse residential gateway), attempt to browse to any webpage. The UVerse gateway will intercept the connection and display a page that says that it has detected a router behind router condition, and ask if you want to configure for that.
Answer yes, and it will prompt you for your system password. Type the password in, and you're good to go!
(Update: I've received feedback that in some newer RG's, instead of asking if you want to configure for router behind router, the RG asks, "Resolve or Dismiss." The correct answer is "Resolve.")
Note: You may need to reboot your router/firewall so it will get its new public IP via DHCP,
and you should assign an IP Address in the 192.168.1.0/24 subnet to your router's external interface so you can still reach the UVerse gateway to configure it later. (Ignore that last part. The 3801HGV will route any 192.168.1.254 traffic to itself, so your firewall or router does not need to have an address on that subnet.)
Hope this saves someone some headaches!
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