If you have an existing network SSID set up, simply use the same name and password for your new router and disable the SSID on the Comcast xFinity router, or rename it. By default, all the networks in the existing network (e.g., home) will connect to t he new machine and you will now have full control of your network.
Place the router in a central location. We know the wires you plug into the router are probably set up … Your Router's Security Stinks: Here's How to Fix It | Tom May 26, 2020 How to use your own modem and router with Comcast
Comcast Modem Router - Best Buy
[SOLVED] Setting up static ip - comcast business to Jan 16, 2018
Jun 19, 2020
Oct 11, 2017 How To Install a VPN on Your Router | PCMag Dec 24, 2018 Xfinity Modem and Router Setup | Synonym