Hi Ole, Dave,
the worst you can expect is a /64 on the link-net and no PD. I suggest you
don't support that case.
The problem is that (some) people are expecting to be able to just plug
other routers behind their main uplink router for whatever reasons (e.g.
additional WiFi-network etc.) like they have with IPv4 or e.g. make a
router just connect to a non-WDS WiFi in client mode and extend their
network.
As the home router shouldn't do PD to further distribute the ISP-prefix
it is hard to support this with IPv6 except with detecting the case and
doing NDP-Proxying then as bridging might not always be possible or
desired in this case.
And supporting all of this above would have the side-effect that such
ISP without PD would be supported as well so I'm not really sure.
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