full image - Repost: Unstable IPv6: No stateless autoconfiguration (SLAAC), DHCPv6 leases don't get renewed (from Reddit.com, Unstable IPv6: No stateless autoconfiguration (SLAAC), DHCPv6 leases don't get renewed)
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I've been having issues with Xfinity and IPv6 lately.I have my own equipment, a Motorola MB8611 DOCSIS 3.1 modem and a Debian GNU/Linux box as my gateway.First off, SLAAC (stateless address autoconfiguration, the default method to assign addresses under IPv6) has never worked for me, so I'm forced to get a dynamic address via stateful DHCPv6 (just like in IPv4). Not ideal, and moreover the address keeps changing, but at least it worked until recently. I also get a delegated prefix for my other computers, 2601:644:xxxx:yyyy::/64, where xxxx and yyyy keep changing as well.Lately the issue is that I do get an initial IPv6 lease, but that it doesn't get renewed before it expires 1-2 hours later, leaving me with only IPv4 connectivity.I do need IPv6, because I sometimes share direct access to some developer boards I have running on my home network for my work colleagues. Setting up IPv4 tunnels for this purpose is a pain.Meanwhile I have a 2nd/backup Internet service over AT&T DSL, which works great in this regard: SLAAC works as expected, and the icing on the cake is that both my IPv4 and IPv6 address (plus delegated prefix) have remained unchanged for several years now. It's a bit slower though, so I would prefer to get Xfinity working, thus this last-ditch effort to get some clues here.Alternatively, is there anywhere else I can get in-depth technical support? I contacted XFinity support over the phone, but needless to say these droids are clueless (and even a bit hostile when the technical bits begin to go over their heads).
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