If you have a roomba, I would think you could block its internet access on your router via its mac address. But for people with Comcast, I wonder if blocked if

If you have a roomba, I would think you could block its internet access on your router via its mac address. But for people with Comcast, I wonder if blocked if it could access what I call the "secret wide-open Concast Router" every Comcast Customer has. Sure there are ways around that.