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My solution was to call and turn their combo router/modem into a modem only and use my old router.. Life was good again :-)
Russ, k4ziv
I had considered this option Russ. That means a whole lot of devices being uprooted and intermittent until I have it all working properly. My DOCSYS modem will allow bridge vs. gateway, so I may do that at some point. Getting the experience of configuring this gateway may help me get down that road eventually.