Internet Protocol Version 6 (IPv6) is a version of the Internet Protocol which is designed to succeed Internet Protocol version 4 (IPv4). IPv6 addresses are 128 bits long and are written groups of four hexadecimal digits separated by colons, for example, IPv6 address for www.cyberciti.biz look like as follows:
2607:f0d0:1002:51::4
OR
2607:f0d0:1002:0051:0000:0000:0000:0004
In short IPv6 addresses are divided into two parts: a 64-bit network prefix, and a 64-bit interface identifier. Further IPv6 classified as follows:
- Unicast addresses - used to identify each network interface.
- Anycast addresses - used to identify a group of interfaces at different locations.
- Multicast addresses - used to deliver one packet to many interfaces.
::1/128
How Do I View LoopBack IPv6 Address under Linux?
Type the following command:$ ifconfig lo
Sample outputs:
lo Link encap:Local LoopbackTo see an IPv6 address assinged to Linux eth0 interface enter:
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:354575118 errors:0 dropped:0 overruns:0 frame:0
TX packets:354575118 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:179276910234 (166.9 GiB) TX bytes:179276910234 (166.9 GiB)
# ip -f inet6 addr show eth0
Sample outputs:
6: eth0: mtu 9000
inet6 2607:f0d0:1002:51::4/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::230:48ff:fe33:bc33/64 scope link
valid_lft forever preferred_lft forever
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