RFC2765 - Stateless IP/ICMP Translation Algorithm (SIIT)

2.2.  Requirements

   The keyWords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
   SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this
   document, are to be interpreted as described in [KEYWORDS].

3.  Translating from IPv4 to IPv6

   When an IPv4-to-IPv6 translator receives an IPv4 datagram addressed
   to a destination that lies outside of the attached IPv4 island, it
   translates the IPv4 header of that packet into an IPv6 header.  It
   then forwards the packet based on the IPv6 destination address.  The
   original IPv4 header on the packet is removed and replaced by an IPv6
   header.  Except for ICMP packets the transport layer header and data
   portion of the packet are left unchanged.

        +-------------+                 +-------------+
            IPv4                          IPv6    
           Header                        Header   
        +-------------+                 +-------------+
          Transport                     Fragment  
           Layer           ===>          Header   
           Header                     (not always)
        +-------------+                 +-------------+
                                        Transport 

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