How to setup two networks using the Arris BGW210-700

Follow the instructions below for ip passthrough for Motorola. Arris bought Motorola. 

https://www.att.com/support/smallbusiness/article/smb-internet/KM1188700/

 
you can also search ip passthrough to find more recent instruction. 

https://forums.att.com/conversations/att-fiber-installation/ip-passthrough-settings/5fbc2e0531a2440fc00028d3

Thanks for the reply. Just to clarify, IP passthrough will allow both the AIO modem and secondary router to work, correct? The secondary router will need a WAN IP that doesn't conflict with the AIO's private LAN IP i I understand correctly. 

Your secondary router will have the same wan ip as the gateway. After you restart the other router, it should be on a different lab ip. 192.168.50.1 in my case. Devices connected via Ethernet to the gateway and router would be on different networks. I presume you are connecting a wireless router. Or a wired router to act as a firewall?

I am connecting a wireless router in this case. Your other router automatically assigned an LAN IP or did you create one from a. pool?  

Let us steer you in the right direction to help with setting up your 2nd router, ponyboyvn.

We see that you've been working with our Ace so far. In case they're unable to help you find the best way to connect your router, we suggest reaching out to the team at our paid service HomeTech. They offer advanced support for 3rd party equipment and more.

Thank you for contacting the AT&T Community Forums team. If you need help with anything else, we'll be here.

Aminah, AT&T Community Specialist

My router assigned a lan ip. DON’T use hometech. You can set this up yourself. 

Definitely a networking noob, but that's my plan. I will steer clear of hometech. Worst case if my config goes south is to do a reset and start over. Thanks very much for providing guidance.