Ipv6 Over Ipv4 Tunnel - H3C S9500 Series Operation Manual

Operation Manual – Tunneling
H3C S9500 Series Routing Switches
the network. A tunnel is a virtual point-to-point connection. In practice, the virtual
interface that supports only point-to-point connections is called tunnel interface. One
tunnel provides one channel to transfer encapsulated packets. Packets can be
encapsulated and decapsulated at both ends of a tunnel. Tunneling refers to the whole
process from data encapsulation to data transfer to data decapsulation.
Note:
For related configuration about the dual protocol stack, refer to Dual Stack
Configuration.

1.1.1 IPv6 over IPv4 Tunnel

I. Principle
The IPv6 over IPv4 tunneling mechanism encapsulates an IPv4 header in IPv6 data
packets so that IPv6 packets can pass an IPv4 network through a tunnel to realize
interworking between isolated IPv6 networks, as shown in
Caution:
The devices at both ends of an IPv6 over IPv4 tunnel must support IPv4/IPv6 dual
stack.
Figure 1-1 Principle of IPv6 over IPv4 tunnel
The IPv6 over IPv4 tunnel processes packets in the following way:
Chapter 1 Tunneling Configuration
1-2
Figure 1-1.