twc SB6183 dropping IPv6 traffic TL;DR - The Arris SB6183 cable modem is dropping IPv6 TCP traffic with the timestamp TCP option. See the "Workarounds" section for possible workarounds. 13 months later (October 2016), my
router Fedora-based router with DHCPv6-PD support I threw together some hardware I had on hand to make a PC-based router. IPv4 Getting IPv4 working was easy, I just needed to set ZONE=external and ZONE=trusted on the wan/