Chapter 2 IPv6 Basic Configuration
it can use this address. That is, it can specify this ad-
dress for the source address of the IPv6 packet when it
sends out a request for configuration information. This
address can be expressed as 2000:0:0:0:0:0:0:1, or
expressed as 2000::1.
–
Loopback address
In IPv4, the loopback address is defined as 127.0.0.1.
Any packet that sends a loopback address must be sent
to a network interface through protocol stack, instead of
being sent to the network link. The network interface
itself shall accept these packets in the same way as
it receives packets from external nodes, and transmits
them back to the protocol stack.
The loopback function is used for software test and con-
figuration. Except the lowest bit, all the other bits of an
IPv6 loopback address are 0, that is, a loopback ad-
dress can be expressed as 0:0:0:0:0:0:0:1 or ::1.
–
IPv6 address embedded with IPv4 address
In the RFC 2373, IPv6 provides two kinds of addresses.
One is the IPv4-compatible address, which allows the
IPv6 node to access IPv4 nodes that do not support
IPv6.. The other is the IPv4-mapping address, which
allows the IPv6 router to transmit IPv6 packets over
the IPv4 network in the tunnel mode, where the nodes
understand both IPv4 and IPv6.
The high-order 80 bits of these two kinds of addresses
are all set to zeros, and the low-order 32 bits contain
the IPv4 address. If the middle 16 bits of an address
are set to FFFF, it indicates that this address is the IPv6
address mapping to IPv4 address.
shows the
address structures of these two kinds of addresses.
T
ABLE
5 S
TRUCTURE OF THE
IP
V
6 A
DDRESS
E
MBEDDED
W
ITH
IP
V
4 A
DDRESS
IPv4 Compatible Address
80
16
32
0000…………………………………………0000
0000
IPv4
address
IPv4 image address
80
16
32
0000…………………………………………0000
FFFF
IPv4
address
�
Link Local Address and Site-Local Address
Using the network Model 10 address to translate IPv4 net-
work addresses provides an option for the institutions that
do not want to apply for globally unique IPv4 network ad-
dresses.
Confidential and Proprietary Information of ZTE CORPORATION
9
Summary of Contents for ZXR10 T1200
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