Comcast Makes It More And More Difficult To Opt-Out Of Internet Sharing.

Here’s how to opt out: Buy your own cheap wi-fi router. Set it up as an access point and connect it to any of your Comcast router’s LAN ports with a patch cable.

Put a metal colander over the Comcast device and place the router itself on some aluminum foil. This is a Faraday cage,  so the signal will be attenuated to ~1m or less.

To avoid being double-NATted (which can cause problems with some services), place the IP address of your new wireless access point in the DMZ of the Comcast router.

I recommend this model as it’s cheap and very reliable.

It costs $50 to defeat that evil empire, but sometimes it’s Comcast or nothing so most people can’t just switch. And this will kill the empire’s wi-fi, but let you have your own still without strangers leeching it and doing who knows what.