@David-TP I tried Xfinity chat and technical support (which is a real PITA over the relay service - I am deaf). Both were completely clueless. Technical support had no clue what I was talking about...

Hello, I am attempting to get IP6 set up and working on my home W7200 mesh. I have Xfinity gigabit. What would be the proper settings to get it to work? The default settings populate including DNS...