Follow-on: IPv6 Subnet PD Nightmare With Comcast's Recent Network Upgrade

I want to share new information regarding the IPv6 problems I am experiencing per my original post.

Part of Comcast's service upgrade included a modem firmware update, which obsoleted non-DOCSIS 3.1 compatible modems. Also obsoleted are DOCSIS 3.1 modems that do not support >1gbs speeds; my Motorola MB8600 fell into that group. (I have the Gigabit Internet Plan; 1200mbs down, 35mbs up.)

I was lucky enough to speak with a Comcast tech who verified that my current MB8611 has a valid IPv6 /64 address. The WAN interface on my router receives an IPv6 /128 address. Inasmuch as this suggests a firmware issue, the tech suggested I touch bases with Motorola. I currently have an open ticket and am awaiting their response.

I will update when there is more news.