Managing HP Serviceguard for Linux, Seventh Edition, July 2007

IPv6 Network Support
IPv6 Address Types
Appendix E 359
multiple groups of 16-bits of zeros. The “::” can appear only once in
an address and it can be used to compress the leading, trailing, or
contiguous sixteen-bit zeroes in an address. Example:
fec0:1:0:0:0:0:0:1234 can be represented as fec0:1::1234.
• In a mixed environment of IPv4 and IPv6 nodes an alternative form
of IPv6 address will be used. It is x:x:x:x:x:x:d.d.d.d, where the
x’s are the hexadecimal values of higher order 96 bits of IPv6 address
and the d’s are the decimal values of the 32-bit lower order bits.
Typically IPv4 Mapped IPv6 addresses and IPv4 Compatible IPv6
addresses will be represented in this notation. These addresses are
discussed in later sections.
Examples:
0:0:0:0:0:0:10.1.2.3
and
::10.11.3.123
IPv6 Address Prefix
IPv6 Address Prefix is similar to CIDR in IPv4 and is written in CIDR
notation. An IPv6 address prefix is represented by the notation:
IPv6-address/prefix-length
where ipv6-address is an IPv6 address in any notation listed above and
prefix-length is a decimal value representing how many of the
leftmost contiguous bits of the address comprise the prefix. Example:
fec0:0:0:1::1234/64
The first 64-bits of the address fec0:0:0:1 forms the address prefix. An
address prefix is used in IPv6 addresses to denote how many bits in the
IPv6 address represent the subnet.