In the not working case, wm0 has: inet6 2405:9800:b550:2939:f234:69d6:e0bf:8ebf/64 flags 0x0 inet6 2405:9800:b550:2939:8638:35ff:fe48:5720/128 flags 0x0 and it would be good to understand where the second comes from. Maybe add "-d" to dhcpcd_flags in /etc/rc.conf and see what it says? Martin