
IPv6 Overview
118428-A Rev. A 1-21
An IPv4-compatible address combines hexadecimal and decimal values as
follows:
x.x.x.x.x.x.d.d.d.d
x:x:x:x:x:x is a hexadecimal representation of the six high-order 16-bit pieces of
the address and
d.d.d.d
is a decimal representation of the four 8-bit pieces of the
address. For example:
0:0:0:0:0:0:13.1.68.3
or
::13.1.68.3
Tunnels
Tunneling is a forwarding technique in which a packet is encapsulated inside
another packet.
IPv6 supports two kinds of encapsulating tunnels: IPv4 tunnels and IPv6 tunnels.
In IPv4 tunneling, a router running both IPv6 and IPv4 encapsulates an IPv6
packet within an IPv4 packet. This technique allows IPv6 nodes in noncontiguous
IPv6 regions to forward messages through an intervening region of IPv4 nodes.
In IPv6 tunneling, a router running IPv6 encapsulates an IPv6 packet in another
IPv6 packet. This section covers the following topics:
Topic Page
Static IPv4 Tunnel 1-22
Automatic IPv4 Tunnel 1-23
Semiautomatic IPv4 Tunnel 1-25
IPv6 Tunnels 1-25
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