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The whole setup changed when the contract changed. I used to get the /64 through RA. Now I get just a default route through RA, no prefix, but DHCPv6 magically works now, and PD 0 is the old /64, with a /56 mask instead.
DHCPv6 used to return "no prefix available". After the changeover, it stopped working *entirely* (packets ignored) until I set my DUID to a magic format, then started returning prefixes after that.
So yes, it pretty clearly didn't work before, and the whole configuration changed with the contract change, but it maintained the same prefix, which was clearly wider to begin with.
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