typically the ISP router snoops DHCPv6 messages and does route injection based
on that, or the DHCPv6 server runs on the ISP router and does route injection
based on binding state.
I'm doing the latter at home since I don't have any native IPv6 here so
I have a router doing 6in4 to he.net on the wan-side and it serves
prefixes using DHCPv6-PD to the lan side. I regularly connect homenet
routers to it or bridge a VM with homenet to the wired side for testing.
OpenWrt's DHCPv6-server does that automatically if you assign a prefix
larger than /64 to an interface (first /64 is assigned via RA/DHCPv6 to
clients on-link, rest is avaialble via PD, routes are set up based on
binding).
Btw. HNCP specifies optional downstream PD from a homenet to legacy /
stub-routers and our reference implementation should support that as
well so its not all too offtopic for homenet I suppose.
Cheers,
Steven
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