Comcast box and third party router

Hey there, @user_dwrkop! Thank you so much for taking the time to reach out to us here on the Xfinity Forums! You can certainly have your network set up just how it will fit your household needs. There are many ways to accomplish that, you can place a rented Xfinity gateway in bridge mode, and use your own router/ mesh system/ switch that fits your needs. You can also purchase your own customer modem, and use the router/ mesh system/switch off that. If you are using a rented Xfinity gateway, you will need to follow the steps here to ensure the bridge mode is enabled. If you are using your own customer modem, you will want to follow the link here to make sure the modem supports the speeds you are subscribed to. Please let us know if you have any other questions/concerns, we are happy to help!