Introduction To Ipv4 Over Ipv6; Ipv4 Over Ipv6 Supported By The S9300&S9300E - Huawei S9300 Configuration Manual

S9300&S9300E Terabit Routing Switch
Configuration Guide - IP Service

12.1 Introduction to IPv4 over IPv6

You can create tunnels on the IPv6 networks to connect IPv4 isolated sites so that IPv4 isolated
sites can access other IPv4 networks through the IPv6 Internet.
During the transition from the IPv4 Internet to the IPv6 Internet, IPv6 networks have been widely
deployed, whereas IPv4 networks are isolated. The tunnel technology can be adopted to establish
tunnels over IPv6 networks to connect isolated IPv4 networks. This is similar to the situation
where the tunnel technology is used to deploy VPNs on IP networks. The tunnel used to connect
isolated IPv4 networks over IPv6 networks is called an IPv4 over IPv6 tunnel.
12.2 IPv4 over IPv6 Supported by the S9300&S9300E
This section describes how to interconnect IPv4 networks through IPv6 networks.
The S9300&S9300E supports the enabling of IPv4 and IPv6 protocol stacks on the devices at
the border of IPv6 and IPv4 networks.
Figure 12-1 Networking diagram of an IPv4 over IPv6 tunnel
IPv4
Host
Figure 12-1
1.
2.
3.
Issue 01 (2012-03-15)
Dual Stack
Switch
IPv4
network
IPv4
Header
IPv4
Payload
shows the principles of the IPv4 over IPv6 tunnel technology.
Enabling IPv4/IPv6 dual stacks
Enable IPv4 and IPv6 protocol stacks on the border device.
Encapsulating IPv6 packets
After receiving a packet from the IPv4 network, the border device takes the received IPv4
packet as the payload, adds an IPv6 packet header before the payload, and encapsulates it
into an IPv6 packet if the device finds that the destination of the packet is not itself.
Transmitting the encapsulated packet
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IPv6
network
IPv4 over IPv6 Tunnel
IPv6
Header
IPv4
Header
IPv4
Payload
12 IPv4 over IPv6 Tunnel Configuration
Dual Stack
Switch
IPv4
network
IPv4
Header
IPv4
Payload
IPv4
Host
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