IPv6 packets can be sent, depending on the intended purpose, in a variety of ways:

• unicast: used for 1-to-1 communication; it sends the packet to a specific node.
  • Certain unicast addresses within the IPv6 address space are reserved.
• anycast: used for 1-to-1-of-many communication;
  • it sends the packet to multiple nodes but only intended to the closest on its route.
• multicast: used for 1-to-many communication; it sends the packet to multiple nodes.

IPv6 multicast