RFC2765 - Stateless IP/ICMP Translation Algorithm (SIIT)

         Source Address:
                 The low-order 32 bits is the IPv4 source address.
                 The high-order 96 bits is the IPv4-mapped prefix
                 (::ffff:0:0/96)

         Destination Address:
                 The low-order 32 bits is the IPv4 destination
                 address.  The high-order 96 bits is the IPv4-
                 translated prefix (0::ffff:0:0:0/96)

   If IPv4 options are present in the IPv4 packet, they are ignored
   i.e., there is no attempt to translate them.  However, if an
   uneXPired source route option is present then the packet MUST instead
   be discarded, and an ICMPv4 "destination unreachable/source route
   failed" (Type 3/Code 5) error message SHOULD be returned to the
   sender.

   If there is need to add a fragment header (the DF bit is not set or
   the packet is a fragment) the header fields are set as above with the
   following exceptions:

      IPv6 fields:

          Payload Length:
                  Total length value from IPv4 header, plus 8 for the
                  fragment header, minus the size of the IPv4 header
                  and IPv4 options, if present.

          Next Header:
                  Fragment Header (44).

      Fragment header fields:

          Next Header:
                  Protocol field copied from IPv4 header.

          Fragment Offset:

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