Novell LINUX ENTERPRISE SERVER 11 - ADMINISTRATION Administration Manual page 224

Prefix (hex)
2 or 3 as the first
digit
fe80::/10
fec0::/10
ff
A unicast address consists of three basic components:
Public Topology
The first part (which also contains one of the prefixes mentioned above) is used to
route packets through the public Internet. It includes information about the company
or institution that provides the Internet access.
Site Topology
The second part contains routing information about the subnetwork to which to
deliver the packet.
Interface ID
The third part identifies the interface to which to deliver the packet. This also allows
for the MAC to form part of the address. Given that the MAC is a globally unique,
fixed identifier coded into the device by the hardware maker, the configuration
procedure is substantially simplified. In fact, the first 64 address bits are consoli-
dated to form the EUI-64 token, with the last 48 bits taken from the MAC, and
the remaining 24 bits containing special information about the token type. This also
makes it possible to assign an EUI-64 token to interfaces that do not have a MAC,
such as those based on PPP or ISDN.
210 Administration Guide
Definition
Aggregatable global unicast addresses. As is the case with IPv4,
an interface can be assigned to form part of a certain subnetwork.
Currently, there are the following address spaces: 2001::/16
(production quality address space) and 2002::/16 (6to4 address
space).
Link-local addresses. Addresses with this prefix should not be
routed and should therefore only be reachable from within the
same subnetwork.
Site-local addresses. These may be routed, but only within the
network of the organization to which they belong. In effect, they
are the IPv6 equivalent of the current private network address
space, such as 10.x.x.x.
These are multicast addresses.