====== Ubuntu - Networking - IPv6 - Unicast, anycast, multicast - IPv6 multicast ======

**IPv6 multicast** works by nodes joining multicast groups by sending Multicast Listener Discovery (MLD) report messages.

<WRAP info>
**NOTE:**  A **node** is an interface enabled for IPv6.

  * Router is any node that forwards IPv6 packets that are not expressly addressed to it.
  * Host is any node that is not a router.

</WRAP>

Multicast groups are not constrained by local or global (network) geography.

  * Whether the host is on the local network or on the internet, as long as it is signaling to join a multicast group, it can receive multicast packets sent to that group.

Any host can be a sender, whether it is part of the multicast group or not.

  * Only hosts part of the multicast group are receivers.
  * Hosts can join or leave multicast groups dynamically at any time.

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[[Ubuntu:Networking:IPv6:Unicast, anycast, multicast:IPv6 multicast:IPv6 multicast addresses: FF00::/8|IPv6 multicast addresses: FF00::/8]]

[[Ubuntu:Networking:IPv6:Unicast, anycast, multicast:IPv6 multicast:Well-known IPv6 multicast addresses|Well-known IPv6 multicast addresses]]