What are IPv6 Multicast Addresses?

Tagged: IPv6

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- August 3, 2020 at 11:33 am #14008
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  What are IPv6 Multicast Addresses?
- August 3, 2020 at 11:34 am #14009
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  In IPv6, a multicast address identifies a group of interfaces on different hosts. If an IPv6 packet contains a multicast address as the destination address, the IPv6 packet will get delivered to all interfaces that are assigned that multicast address. Please note that in IPv6, a particular interface may belong to any number of multicast groups.
  
  In IPv6, a multicast address has the following format:
  
  1111 1111 | Flags | scop | Group ID
  
  The first eight bits of a multicast address are 1111 1111 or FF in hexadecimal. The next 4 bits are used as flags. These bits specify whether the multicast address is permanently assigned by IANA or it is non-permanently assigned.
  
  The next 4 bits are scop. They are used to limit the scope of the multicast group. For example, 0010 or 2 (hexadecimal) is used to indicate a link-local scope. 0101 or hexadecimal 5 is used to specify a site-local scope and 1110 or hexadecimal E is used to specify the global scope.
  
  The last 112 bits specify the group ID. The group ID identifies the multicast group.
  
  Example:
  
  If some servers are assigned a permanent multicast address with the group ID 123 (hexadecimal), then:
  
  The multicast address FF02:0:0:0:0:0:0:123 specifies that all the servers are on the same link as the sender.
  
  The multicast address FF05:0:0:0:0:0:0:123 specifies that all the servers are on the same site as the sender.
  
  And, the multicast address FF0E:0:0:0:0:0:0:123 specifies that all the servers are on the Internet.
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