How do I turn off the router on my Comcast modem?

Open a web browser on one of your computers and in the address bar type the IP address of it (the default one for the Comcast Xfinity is 10.0. 0.1) and enter the login credentials. 2. Once you are connected, navigate to Gateway > WiFi and click on Edit for both the 2.4 GHz and the 5 GHz and disable the WiFi.