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According to the RFC 2464, an IPv6 packet with a multicast
destination address DST, consisting of the sixteen octets DST[1]
through DST[16], is transmitted to the Ethernet multicast address
whose first two octets are the value 3333 hexadecimal and whose last
four octets are the last four octets of DST.
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 1 1 0 0 1 1|0 0 1 1 0 0 1 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| DST[13] | DST[14] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| DST[15] | DST[16] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+