ZXR10 ZSR V2 Configuration Guide (IPv6)
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If the termination address of the IPv6 over IPv4 tunnel cannot be automatically
obtained from the destination address of the IPv6 packet but needs to be manually
configured, the tunnel is called a configured tunnel, such as a 6in4 tunnel.
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If the interface address of the IPv6 over IPv4 tunnel assumes a special
IPv4-embedded IPv6 address format (i.e. the IPv4 address of the tunnel termination
point can be automatically obtained from the destination address of the IPv6 packet),
the tunnel is called an automatic tunnel, such as a 6to4 tunnel or an ISATAP tunnel.
There is another type of IPv4 or IPv6 over IPv6 tunnel. The protocol encapsulates an IPv4
or IPv6 data packet so that the encapsulated data packet can be transmitted in another
IPv6 network. The data packet after the encapsulation is an IPv6 tunnel packet, as shown
in
.
Figure 16-2 Principles of the IPv4 (or IPv6) over IPv4 Tunnel
In
, Original data refers to the IPv4 or IPv6 packet.
A DS-list tunnel enables IPv4 users to access IPv4 Internet after traversing a pure IPv6
network.
It implements carrier-class IPv4 address multiplex through IPv4-IPv4 NAT.
Packets are encapsulated and decapsulated in the tunnel on the forwarding plane.
6in4 Tunnel
shows the operating principles of a 6in4 tunnel.
Figure 16-3 Principles of a 6in4 Tunnel
The 6in4 tunnel involves a tunnel encapsulation and decapsulation process.
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SJ-20140504150128-018|2014-05-10 (R1.0)
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