11-15-2018, 09:45 PM
This is a systemd bug (there are many for IPv6, btw). Not a great solution, but restarting systemd-networkd will get SLAAC working again. Oh, btw, you will need to do that after every sleep (gotta love systemd). I have created an alias to make things go faster.
# fix stupid systemd
alias 6fix='sudo systemctl restart systemd-networkd'
# fix stupid systemd
alias 6fix='sudo systemctl restart systemd-networkd'