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[Firmware] SB8200.0200.174F.311915.NSH.RT.NA Firmware - IPV6 Fails

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My SB8200 was just updated to SB8200.0200.174F.311915.NSH.RT.NA and I have noticed that when IPv6 is enabled, traffic forwards for IPv4 and IPv6 for a few moments, then the CM stops forwarding all traffic. I have comcast engaged, due to some resolved outages in area...but as long as I run IPv4 only, traffic is passed. What's concerning, as soon as IPv6 is enabled, and DHCP-PD (I receive a /60) goes live, all traffic on both stacks stops completely...requiring a power cycle of the modem to clear...and issue repeats itself. I've ruled out equipment on my side, and getting DOCSIS 3.1 channels... Just I no loner can run dual stack anymore...which I had been running for over a year now without issue.. Anyone having IPv6 issues like this? Using DHCP-PD .... I'm beginning to believe is has something to do with the new firmware....ugh.. TIA s

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