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A comment on I spent a week without IPv4 to understand IPv6 transition mechanisms. Parent comment

Re:I spent a week without IPv4 to understand IPv6 transition... by kaetemi on Monday March 06, 2023 @08:47PM (#35050453)
My ISP's modem doesn't do prefix delegation so I don't even get IPv6 with my own router in-between. And I need that thing in-between to at least have some control over the IPv4 LAN. No idea what security that modem provides, since there are zero controls, so no IPv6 it is.
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Re:I spent a week without IPv4 to understand IPv6 transition... by sgtnoodle on Tuesday March 07, 2023 @01:26AM (#35052242)
You could still route within the /64, couldn't you? With a smaller subnet SLAAC wouldn't work, but you could DHCPv6 addresses still. There is also an RFC somewhere for sharing a single /64, intended for mobile hotspots.
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Re:I spent a week without IPv4 to understand IPv6 transition... by kaetemi on Tuesday March 07, 2023 @10:12AM (#35056178)
No idea. I've tried every setting combination on this consumer grade D-Link router which is supposed to support IPv6. Nothing results in a functioning network. Forum posts I find from other customers of this ISP report the same behaviour on other routers. The modem gets a /56 at least, and hands out addresses from a /64 range under that I assume, the router gets a /128 from the modem, and then gives up entirely on doing anything with IPv6.
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Re:I spent a week without IPv4 to understand IPv6 transition... by sgtnoodle on Tuesday March 07, 2023 @11:40AM (#35057423)
It sounds like your ISP is delegating a prefix, then? Weird, that all sounds reasonable to me. What do you mean the router gives up entirely, though? Computers in the LAN don't get an IP address? Packets go out but nothing comes back?
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Re:I spent a week without IPv4 to understand IPv6 transition... by kaetemi on Wednesday March 08, 2023 @12:14AM (#35065526)
Yup, computers on the LAN don't get any address. From what I understand, the modem would be supposed to delegate a prefix to the router so it can hand out addresses, but this part isn't happening.
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