Chapter 1 IPv6 Address Configuration
Each IPv6 packet can have 0, 1 or more extension headers. Each extension header
is determined by the "next header" domain of the previous header.
Address Classifications
In
2373, addresses are classified based on the address prefix. For a list of IPv6
address types, refer to
.
Table 1-1 IPv6 Address Types
Address Type
Prefix (Binary)
Unassigned addresses
00...0(128 bits)[::/128]
Loopback addresses
00...1(128 bits )[::1/128]
Multicast addresses
11111111[FF00::/8]
Link-local unicast addresses
1111111010[FE80::/10]
Global unicast addresses
Others
The broadcast address in IPv6 is not valid any more. RFC2373 defines three types of IPv6
address:
l
Unicast
It is the identifier of a single interface. The packets sent to a unicast address will be
transmitted to the interface with this address identifier.
l
Multicast
It is the identifier of a group of interfaces. These interfaces belong to different nodes.
The packets sent to a multicast address will be transmitted to all the interfaces with
this address identifier.
l
Anycast
It is the identifier of a group of interfaces. These interfaces belong to different nodes.
The packets sent to an anycast address will be transmitted to an interface with this
address identifier (selecting the nearest one by calculating the distance based on
routing protocol).
An IPv6 unicast address can be regarded as an entity with two fields. One field is used
to identify networks and the other is used to identify interfaces of nodes on this network.
In the subsequent description of the specific unicast address types, the user will find that
the network identifier can be divided into several parts, each of which identifies different
network part.
1.
Unicast address
An IPv6 unicast address can have a varied-length prefix. For the structure of the IPv6
unicast address, refer to
.
1-3
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