Operation Manual – IPv6 ConfigurationH3C S7500E Series Ethernet Switches Chapter 2 Dual Stack Configuration2-1Chapter 2 Dual Stack ConfigurationWhen configuring dual stack, go to these sections for information you are interested in:z Dual Stack Overviewz Configuring Dual Stack2.1 Dual Stack OverviewDual stack is the most direct approach to making IPv6 nodes compatible with IPv4nodes. The best way for an IPv6 node to be compatible with an IPv4 node is to maintaina complete IPv4 stack. A network node that supports both IPv4 and IPv6 is called a dualstack node. A dual stack node configured with an IPv4 address and an IPv6 addresscan have both IPv4 and IPv6 packets transmitted.For an upper layer application supporting both IPv4 and IPv6, either TCP or UDP canbe selected at the transport layer, while IPv6 stack is preferred at the network layer.Figure 2-1 illustrates the IPv4/IPv6 dual stack in relation to the IPv4 stack.Figure 2-1 IPv4/IPv6 dual stack in relation to IPv4 stack (on Ethernet)2.2 Configuring Dual StackYou must enable the IPv6 packet forwarding function before dual stack. Otherwise, thedevice cannot forward IPv6 packets even if IPv6 addresses are configured forinterfaces.Follow these steps to configure dual stack on a gateway:
