It just doesn't do it… Probably have to add it to all the interfaces it originates from
Actually adding an IPv6 address from the prefix is is using in the router advertisements would be amazing… Not sure how that now is supposed to work /o\
andi-: can you elaborate?
well it sends RAs with the prefix 2001:db8:1::/64 on the interface without having an address on the interface. it isn't required to have an address from the range on the interface but I'd almost say a best practice.
you should be able to set Address=:: on a downstream interface, and if you configured it to do IPv6 IA_PD on the upstream interface, it should automatically slice and add a matching address from a /64 on the downstream interface…