$ /sbin/ifconfig eth1.7
eth1.7    Link encap:Ethernet  HWaddr 00:0B:DB:91:43:4C
          inet addr:192.168.10.1  Bcast:192.168.10.3  Mask:255.255.255.252
          inet6 addr: 2001:630:1c0:4::/64 Scope:Global
          inet6 addr: fe80::20b:dbff:fe91:434c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:121245 errors:0 dropped:0 overruns:0 frame:0
          TX packets:124914 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:53808342 (51.3 Mb)  TX bytes:84829155 (80.8 Mb)

$ ping6 2001:630:1c0:4::
PING 2001:630:1c0:4::(2001:630:1c0:4::) 56 data bytes
From ::1 icmp_seq=0 Destination unreachable: Address unreachable