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IPv6 Multicast
Multicast for IPv6 is based on the same principles as multicast in IPv4 or,
for that matter, multicast in link layer protocols like Ethernet.
• Nodes that are members of a multicast group receive packets
transmitted to the multicast group address.
• The original sender of a multicast packet sends it only once, but
the packet will be repeated so as to be delivered to all group
members.
• When a multicast packet is transmitted on a multiaccess net-
work, in which all nodes can detect all transmissions but ignore
those addressed to nodes other than themselves, group mem-
bers all process the same packet transmitted by the original
sender. ...