77f06c476c
PREF64 allows a router to advertise the network's NAT64 prefix, allowing clients to auto-configure CLAT. This makes it possible to deploy IPv6-only or IPv6-mostly client access networks without the need for DNS64. Reviewed by: imp, glebius (prior suggetions done) Pull Request: https://github.com/freebsd/freebsd-src/pull/1206