This is something I'm trying to make happen on a raspberry Pi, but it's
really a systemd problem, so I hope you folk can help.
When systemd.sysctl runs, it runs early - before interfaces are up and
apparently before modules such as IPv6 are loaded. A bunch of IPv6-
related sysctl variables thus don't get set. It does run though -
status says it's been run. If I run it again manually, everything