My first IT adjacent job was remote support for Support Dot Com who contracted me out to Comcast. This was just as they were trying to get away from the maligned ‘comcast’ brand by calling everything ‘Xfinity’ like they think their customers are idiots. Well, turns out they mostly are. I don’t even think I lasted six months. Despite having the best metrics in the company, I just couldn’t take the abuse, or the lack of downtime between calls.

Anyway the point is you can call up Comcast and have them put your router into ‘bridge mode’ making it essentially an expensive modem, then connect your own router.