Chapter 2 Dual Stack Configuration; Dual Stack Overview; Configuring Dual Stack - H3C S5500-SI Series Operation Manual

Operation Manual – IPv6
H3C S5500-SI Series Ethernet Switches

Chapter 2 Dual Stack Configuration

When configuring dual stack, go to these sections for information you are interested in:

Dual Stack Overview

Configuring Dual Stack

2.1 Dual Stack Overview
Dual stack is the most direct approach to making IPv6 nodes compatible with IPv4
nodes. The best way for an IPv6 node to be compatible with an IPv4 node is to maintain
a complete IPv4 stack. A network node that supports both IPv4 and IPv6 is called a dual
stack node. A dual stack node configured with an IPv4 address and an IPv6 address
can have both IPv4 and IPv6 packets transmitted.
For an upper layer application supporting both IPv4 and IPv6, either TCP or UDP can
be selected at the transport layer, while IPv6 stack is preferred at the network layer.
Figure 2-1
Figure 2-1 IPv4/IPv6 dual stack in relation to IPv4 stack (on Ethernet)
2.2 Configuring Dual Stack
You must enable the IPv6 packet forwarding function before dual stack. Otherwise, the
device cannot forward IPv6 packets even if IPv6 addresses are configured for
interfaces.
Follow these steps to configure dual stack on a gateway:
illustrates the IPv4/IPv6 dual stack in relation to the IPv4 stack.
Chapter 2 Dual Stack Configuration
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