Router

@user_rqxmcx

Thanks for reaching out, this link https://www.xfinity.com/support/articles/wireless-gateway-enable-disable-bridge-mode has great information on using bridge mode with your own personal separate Wi-Fi router in connection with the Xfinity modem

Lost wifi after enable bridge 

That's the way it is supposed to work. In bridge mode, the gateway acts only as a straight cable modem. The routing and the WiFi functions become disabled.