Airport Extreme with Arris BGW210
So we just got AT&T fiber and if a computer is hooked up to it directly it works great. When I connect one Aiport Extreme, I disabled both wifi channels on the modem and turned on IP Passthrough to the Airport Extreme. When I do this the router does get a public IP and it is able to connect to the internet and works fine. The problem arises when I try to get a second Airport Extreme to extend the single of the first Airport extreme. Whenever I do this as soon as the second Extreme is working the first airport shows that it is "disconnected" so no longer devices on the wifi get internet.
So am I missing a setting in the modem to allow extending of wifi because I can not figure out why this will not work.