Tiny demo $ ifconfig sm1 sm1: flags=8863 mtu 1500 media: Ethernet 10baseT inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255 inet6 fe80:1::200:86ff:fe05:80fa prefixlen 64 inet6 3ffe:501:4819:2000:200:86ff:fe05:80fa prefixlen 64 $ ifconfig lo0 lo0: flags=8009 mtu 32976 inet 127.0.0.1 netmask 0xff000000 inet6 fe80:2::1 prefixlen 64 inet6 ::1 prefixlen 128 $ ping6 ::1 PING6(56=40+8+8 bytes) ::1 --> ::1 16 bytes from ::1, icmp_seq=0 hlim=64 time=0.137 ms 16 bytes from ::1, icmp_seq=1 hlim=64 time=0.112 ms $ telnet localhost Trying ::1... Connected to localhost. Escape character is '^]'. FreeBSD (banana.kame.net) (ttyp8) login: