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search   6to4 is especially relevant during the initial phases
of deployment to full, native IPv6 connectivity, since IPv6 is
not required on nodes between the host and the destination.
However, it is intended only as a transition mechanism and is
not meant to be used permanently.  6to4 may be used by an
individual host, or by a local IPv6 network. When used by a
host, it must have a global IPv4 address connected, and the host
is responsible for encapsulation of outgoing IPv6 packets and
decapsulation of incoming 6to4 packets. If the host is
configured to forward packets for other clients, often a local
network, it is then a router.  Most IPv6 networks use
autoconfiguration, which requires the last 64 bits for the host.
The first 64 bits are the IPv6 prefix. The first 16 bits of the
prefix are always 2002:, the next 32 bits are the IPv4 address,
and the last 16 bits of the prefix are available for addressing
multiple IPv6 subnets behind the same 6to4