RFC2765 - Stateless IP/ICMP Translation Algorithm (SIIT)

         Destination Address:
                 IPv6 packets that are translated have an IPv4-mapped
                 destination address.  Thus the low-order 32 bits of
                 the IPv6 destination address is copied to the IPv4
                 destination address.

   If any of an IPv6 hop-by-hop options header, destination options
   header, or routing header with the Segments Left field equal to zero
   are present in the IPv6 packet, they are ignored i.e., there is no
   attempt to translate them.  However, the Total Length field and the
   Protocol field would have to be adjusted to "skip" these extension
   headers.

   If a routing header with a non-zero Segments Left field is present
   then the packet MUST NOT be translated, and an ICMPv6 "parameter
   problem/ erroneous header field encountered" (Type 4/Code 0) error
   message, with the Pointer field indicating the first byte of the
   Segments Left field, SHOULD be returned to the sender.

   If the IPv6 packet contains a Fragment header the header fields are
   set as above with the following exceptions:

         Total Length:
                 Payload length value from IPv6 header, minus 8 for
                 the Fragment header, plus the size of the IPv4
                 header.

         Identification:

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