Managing Serviceguard Fifteenth Edition, reprinted May 2008

IPv6 Network Support
IPv6 Address Types
Appendix H524
Unicast Addresses
IPv6 unicast addresses are classified into different types. They are global
aggregatable unicast address, site-local address and link-local address.
Typically a unicast address is logically divided as follows:
Interface identifiers in a IPv6 unicast address are used to identify the
interfaces on a link. Interface identifiers are required to be unique on
that link. The link is generally identified by the subnet prefix.
A unicast address is called an unspecified address if all the bits in the
address are zero. Textually it is represented as “::”.
The unicast address ::1 or 0:0:0:0:0:0:0:1 is called the loopback
address. It is used by a node to send packets to itself.
IPv4 and IPv6 Compatibility
There are a number of techniques for using IPv4 addresses within the
framework of IPv6 addressing.
IPv4 Compatible IPv6 Addresses
The IPv6 transition mechanisms use a technique for tunneling IPv6
packets over the existing IPv4 infrastructure. IPv6 nodes that support
such mechanisms use a special kind of IPv6 addresses that carry IPv4
addresses in their lower order 32-bits. These addresses are called IPv4
Compatible IPv6 addresses. They are represented as follows:
Example:
::192.168.0.1
Table H-2
n bits 128-n bits
Subnet prefix Interface ID
Table H-3
80 bits 16 bits 32 bits
zeros 0000 IPv4 address