So I am having the same issue with a Moto MB8600. It was all good on inital provisioning but after a brief power outage the modem reprovisioned and is only offering an ipv6 ip. I have call support a couple of times but they won't take this up to the tier level required to address the issue. Hopefully, someone from Comcast will see this post and help out with the reprovisioning required to get me back to a usable configuation for my downstream network configuration.
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