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I truly do not understand: what possible reason would Comcast have to keep oscillating their DHCPv6 renewal period between 24 hours and 2 hours?
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Mar 22, 2024 18:59
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After a network upgrade yesterday, my ISP's IPv6 transport ceased entirely. I think I sussed it out, but the system has won: the prospect of trying to get past level 1 support when the internet still halfway works is 
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Apr 30, 2024 14:34
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shackleford posted:do they also announce the (same or different) MTU via the DHCPv4 option? Picked through some packets, I don't see anything about MTU in any of the DHCPv4 release, discover, offer, request, or ack packets.
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May 1, 2024 19:14
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I figured it out, and I was wrong. While I do think that Comcast has something misconfigured and is now erroneously leaking jumbo declared router advertisements, which is making radvd very unhappy and filling my log with error messages, I do not think it was the true cause of my loss of IPv6 transit. What actually happened is that the DHCPv6 server is now on a global address instead of a local, which as far as I can tell is perfectly kosher, while the default firewall configuration expects the DHCPv6 packet to come from the link-local unicast address, not to it.
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May 3, 2024 18:52
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