Brian Julin wrote: > FWIW, this approach opens a bunch of (not insurmountable) security obstacles. > > See draft-itojun-v6ops-v4mapped-harmful-00 For that reason (and others) FreeRADIUS does: setsockopt(this->fd, IPPROTO_IPV6, IPV6_V6ONLY, ... v6 sockets are *only* v6. Mixing the protocols is a bad idea. Alan DeKok.