HP-UX IPv6 Transport Administrator's Guide for TOUR 2.0 (April 2004, rev 2)

IPv6 Software and Interface Technology
Migrating from IPv4 to IPv6
Chapter 7 79
The “6to4” prefix provides a network prefix for the local IPv6 host or
network. The IPv4 address is the endpoint for all external IPv4
connections.
Figure 7-2 “6to4” Prefix
“6to4” Encapsulation
IPv6 packets from a “6to4” site are encapsulated in IPv4 packets when
they leave the site over its external IPv4 connection. IPv6 packets are
transmitted in IPv4 packets with an IPv4 protocol type of 41, the same
protocol type set when IPv6 packets tunnel inside IPv4 frames.
“6to4” Topology Example
“6to4” topology consists of: one or more “6to4” hosts in a “6to4” domain;
at least one “6to4” router in the domain that has at least one IPv4
connection to the Internet; and a “6to4” relay router that is used to
connect to a native IPv6 domain.
001 0x002 IPv4 Address SLA ID Interface ID
0 3 16 48 74
127
15.1.1.1
2002::/16
2002:0f01:0101::/48