XFinity (Comcast) recently sent my parents a new router, and AFAICT there was no way to configure it from a LAN computer.
It required a damn proprietary phone app, which I assume was bouncing commands through the internet.
It required a damn proprietary phone app, which I assume was bouncing commands through the internet.
Your best option is to purchase your own cable modem/router and quit renting that garbage hardware from Comcast.
Or kick them to the curb and go cableless using Verizon with a router that's worth paying for.
They've been having connection hiccups and blaming the old independent router/modem even though I suspect the problem is somewhere further on.