RFC2765 - Stateless IP/ICMP Translation Algorithm (SIIT)

         Flow Label:
                 0 (all zero bits)

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

         Next Header:
                 Protocol field copied from IPv4 header

         Hop Limit:
                 TTL value copied from IPv4 header.  Since the
                 translator is a router, as part of forwarding the
                 packet it needs to decrement either the IPv4 TTL
                 (before the translation) or the IPv6 Hop Limit (after
                 the translation).  As part of decrementing the TTL or
                 Hop Limit the translator (as any router) needs to
                 check for zero and send the ICMPv4 or ICMPv6 "ttl

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