In the hopes that it saves someone else two hours later: the ISP Astound only supports IPv6 in Washington State. You might find this page which says “Astound supports IPv6 in most locations”. Their tech support agents might tell you that they support v6 on your connection, even if you are not in Washington. “Yes, we do support both DHCPv6 and SLAAC”, they might say, and tell you to use a prefix delegation size of 60. If you are staring at tcpdump and wondering why you’re not seeing anything coming back from your router’s plaintive requests for address information, it is because they do not, in fact, support v6 anywhere but Washington.

Tim McCormack

I asked RCN what their plan was for IPv6 back in 2010 or so and they said they just… didn’t have a plan. At least they were honest, I guess?

(RCN has since been bought by Astound, so perhaps they have the concepts of a plan now. :-P)

Chris Adams

It’s actually somewhat impressive how long this has dragged on - like Tim I asked about that back in 2010 and it’s just been crickets ever since then. I really don’t want to switch to Verizon but FIOS has rock-solid IPv6 from what my coworkers tell me.

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