Worked before (dhclient + routes), but on boot:
- we've a correct fe80 address
- no dhclient, but /usr/local/etc/rc.d/dhclient6 start does NOT complain dhclient6_enable="YES" is missing
- when dhclient is started, our correct prefix is returned
- no static IP assignment in current state (missing from /etc/netif/igb0_ipv6)
- we can add manually IP in our prefix
- routing is missing and can't be easily figured (the expectation was dhclient would take care of that)