https://forums.freebsd.org/threads/ipv6-configuration-with-prefixlen-64.16179/
IPv6 configuration with prefixlen != 64 | The FreeBSD Forums
Is there a way to configure the prefixlen for an IPv6 address (in /etc/rc.conf)? Currently, I have set ipv6_enable, ipv6_ifconfig_re0 and...
configurationfreebsdforums