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 778
TUN_ENCAP_SRC_ADDRESS[0]=”3ffe::1”
TUN_ENCAP_DST_ADDRESS[0]=”2ffe::1”
TUN_INTERFACE_STATE[0]=”up”
NOTE Refer to the ifconfig(1m) man page and the
/etc/rc.config.d/netfconf-ipv6 file for more detailed information
on tunneling parameters.
“6to4” - Connecting IPv6 Domains over IPv4 Clouds
“6to4” is an automatic tunneling mechanism that can be used to provide
connectivity between isolated IPv6 domains or hosts across an IPv4
infrastructure and with native IPv6 domains via relay routers. “6to4” is
based on the IP6-in-IP tunneling mechanism defined in RFC 2893 and it
falls under the router-to-router tunneling scenario.
“6to4” uses the concept of automatic tunneling where the tunnel
end-point is determined from the IPv6 destination address and avoids
the complexity of manual tunnel configuration. It does not use the
IPv4-compatible address, but instead determines the tunnel endpoint
IPv4 address from the special “6to4” prefix of the IPv6 destination
address.
“6to4” Well-Known Prefix
“6to4” defines an address assignment scheme that allows a site to obtain
a unique externally routable prefix if the site has at least one globally
unique IPv4 address. The Internet Assigned Number Authority (IANA)
has assigned the unique IPv6 address prefix of 2002::/16 for “6to4”.
Each site must have a border dual stack router that has at least one
global IPv4 address.
A “6to4” prefix can be generated by concatenating the 2002:: prefix to
the global IPv4 address. For example, if the dual stack router has an
IPv4 address 15.1.1.1, then its “6to4” prefix will be 2002:0f01:0101::/48.