RFC2765 - Stateless IP/ICMP Translation Algorithm (SIIT)

                    IPv4-to-IPv6 ICMP Error Translation

   The translation of the inner IP header can be done by recursively
   invoking the function that translated the outer IP headers.

3.5.  Knowing when to Translate

   The translator is assumed to know the pool(s) of IPv4 address that
   are used to represent the internal IPv6-only nodes.  Thus if the IPv4
   destination field contains an address that falls in these configured
   sets of prefixes the packet needs to be translated to IPv6.

4.  Translating from IPv6 to IPv4

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

        +-------------+                 +-------------+
            IPv6                          IPv4    
           Header                        Header   
        +-------------+                 +-------------+
          Fragment                      Transport 
           Header          ===>          Layer    
        (if present)                     Header   

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