[systemd-devel] DHCPv6-delegated prefix not assigned to LAN interface

[Sergey Ermolenko]

Hello,

I am running systemd-networkd setup on router in DHCPv6-PD environment, 
where WAN interface requests IPv6 via DHCPv6, receives the address as 
well as delegated prefixes, with LAN interfaces serving those delegated 
prefixes in their router advertisement messages. It generally works 
well, however, the LAN interfaces on the router themselves do not have 
the IPv6 addresses assigned by systemd-networkd from the prefix it 
serves on that interface.

Doing background research on this issue, there seems to be already 
ticket on this problem: https://github.com/systemd/systemd/issues/14474. 
Unfortunately, late during fixing this ticket, Yu Watanabe changed 
configuration for autoconfiguring the LAN interface with delegated 
address (see 
https://github.com/systemd/systemd/pull/14956#issuecomment-592952080) 
from Network section to IPv6Prefix section. While this works for static 
prefixes, as I understand IPv6Prefix is not in play when distributing 
DHCPv6-PD acquired prefixes, and for DHCPv6-PD, the problem is still 
unsolved.

Am I reading this correctly? Is there a special way of configuring 
DHCPv6-delegated prefixes on LAN interfaces that I am not aware of? Is 
this known issue?

Thanks in advance!