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DUAL STACK CONFIGURATION
When configuring dual stack, go to these sections for information you are
interested in:
■ “Dual Stack Overview” on page 521
■ “Configuring Dual Stack” on page 521
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 156 illustrates the IPv4/IPv6 dual stack in relation to the IPv4 stack.
Figure 156 IPv4/IPv6 dual stack in relation to IPv4 stack (on Ethernet)
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:
IPv4 IPv6
TCP UDP
IPv4/IPv6 Application
Ethernet
Protocol ID:
0x0800
Protocol ID:
0x86DD
IPv4
TCP UDP
IPv4 Application
Ethernet
Protocol ID:
0x0800
IPv4 Stack Dual Stack
To do… Use the command… Remarks
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