AT&T Fiber and Google (Nest) Wifi
Just wanted to share my experience setting up AT&T Fiber (1000) with Google (Nest) Wifi.
I followed all of the instructions related to using Passthrough mode and turned off both Wifi Signals (5 and 2.4G) on the AT&T router and everything works, but the speed detected by the Google Wifi app is about 400 Mbs (or 40% of the speed coming into the house).
Note: Instructions for Passthrough mode here: https://forums.att.com/conversations/att-fiber-equipment/using-google-nest-mesh-system-with-att-fiber/616f8240793b38530dce22b2
I wondered what was going on so I disconnected the Google Wifi and used the same cable to hook up to a laptop. I used the Ookla Windows Speed Test app on the laptop and guess what? It said the speed was 940Mbs up and down exactly as it should be.
I plugged the Google puck back in and ran the speed test from the Google Wifi App again. About 400 down and 90 up.
I used the same exact Google Wifi pucks with Xfinity and the speed registered by the Google Wifi app was almost exactly what I bought from Xfinity, so I know that the Google pucks can do at least 800 Mbs.
The only conclusion I can come to is that there is something about Passthrough mode in the Arris BGW210-700 that severely limits the speeds of a downstream router. If anyone has other ideas about what might going on, please do respond below. Thanks.