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

S9300&S9300E Terabit Routing Switch
Configuration Guide - IP Service

11.1 Introduction to IPv6 over IPv4

An IPv6 packet is transparently transmitted after being encapsulated into an IPv4 packet.
During the transition from the IPv4 Internet to the IPv6 Internet, IPv4 networks have been widely
deployed while IPv6 domains are isolated and dispersed around the world. It is not economical
to connect these isolated sites with private lines.
The usual method is tunnel technology. This technology creates tunnels over IPv4 networks to
connect isolated IPv6 domains. This is similar to the situation where the tunnel technology is
used to deploy VPNs on the IP networks.
The tunnel used to connect isolated IPv6 domains over IPv4 networks is called IPv6 over IPv4
tunnel. To implement this tunnel, enable IPv4/IPv6 dual stacks on the devices at the border of
the IPv4 network and the IPv6 network.
11.2 IPv6 over IPv4 Supported by the S9300&S9300E
You can configure manual IPv6 over IPv4 tunnels or 6to4 tunnels to interconnect IPv6 networks.
Dual Stacks
The simplest way for an IPv6 node to remain compatible with an IPv4 node is to reserve a
complete IPv4 protocol stack. In this way, the IPv6 node maintains a dual-stack structure.
11-1
Figure 11-1 Single stack and dual stack structures (Ethernet)
The characteristics of the dual-stack structure are as follows:
l
Issue 01 (2012-03-15)
shows a single stack structure and a dual stack structure.
IPv4 Application
UDP
TCP
IPv4
Protocol ID:
0x0800
Ethernet
IPv4 Stack
Supported by multiple link layer protocols
Multiple link layer protocols, such as Ethernet, support dual stacks. The link layer in the
above diagram is the Ethernet. For an Ethernet frame with the protocol ID field value of
0x0800 indicates that the network layer has IPv4 packets. The ID field value of 0x86DD
indicates that the network has IPv6 packets.
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11 IPv6 over IPv4 Tunnel Configuration
IPv4/IPv6 Application
TCP UDP
IPv6
Protocol ID:
Protocol ID:
0x86DD
0x0800
Ethernet
Dual Stack
Figure
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