Long story short, I swapped identical Modems that gave a static WAN IP address (yes it was static!) Both had a RF connection, new one showed connected. I moved the Router cable to the new modem with ...
Last time I noted that, for those of us with separate routers and modems, the IP address 192.168.100.1 may provide access to the modem, through the router. In my limited testing, I found this to be ...