RFC2765 - Stateless IP/ICMP Translation Algorithm (SIIT)

         IPv6 enabled node:
                 A node which has an IPv6 protocol stack
                 and is assigned one or more IPv6 addresses.  Both
                 IPv6-only and IPv6/IPv4 nodes are IPv6 enabled.

2.1.  Addresses

   In addition to the forms of addresses defined in [ADDR-ARCH] this
   document also introduces the new form of IPv4-translated address.
   This is needed to avoid using IPv4-compatible addresses outside the
   intended use of automatic tunneling.  Thus the address forms are:

         IPv4-mapped:
                 An address of the form 0::ffff:a.b.c.d which refers
                 to a node that is not IPv6-capable.  In addition to
                 its use in the API this protocol uses IPv4-mapped
                 addresses in IPv6 packets to refer to an IPv4 node.

         IPv4-compatible:
                 An address of the form 0::0:a.b.c.d which refers to
                 an IPv6/IPv4 node that supports automatic tunneling.
                 Such addresses are not used in this protocol.

         IPv4-translated:
                 An address of the form 0::ffff:0:a.b.c.d which refers
                 to an IPv6-enabled node.  Note that the prefix
                 0::ffff:0:0:0/96 is chosen to checksum to zero to

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