RBR50 automatically setting up as a 10.1.1.1 subnet

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WDahl wrote:

I now have a ATT fiber ISP with it setup as PassThrough. 

The ATT Router is 192.168.1.254

 

The Orbi Router on Advanced Internet is setup with the following:

Internet Setup TAB

IP            192.168.1.1

Mask       255.255.255.0

Gateway  192.168.1.254

 

An it keeps changing the IP back to 10.0.0.1    WHY??????

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Wneh the WAN (internet) side of the Orbi has an IP address of 192.168.1.x, then it automatically sets the LAN IP subnet to 10.0.0.x

(Yes, in theory any of the 192.168.x subnets (bwesides 1) could have been used, but Netgear chose to change to the entirely different private IP space.)

My guess is that the ATT fiber unit is not set to bridge or passthrough mode. 

OR... (because I know so little about AT&T), it could be that AT&T has so many customers that they are unwilling to waste a precious public IP address on every one of them, and have set up a router "upstream" to NAT them all from different subnets to the one public IP.  The fiber ONT may simply be passing along the private subnet IP.  If this is the case (a big "if" because of my lack of knowledge) then it will be impossible to do any activity that is broken by a Double NAT (OpenVPN, forwarding any ports, certain types of internet gaming, etc.)

https://whatismyipaddress.com/  will display what your public IP address is, and this is what should appear on the WAN side of the Orbi.