MULTICAST COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To make a client host capable of learning accounting information or authentication failure information.

SOLUTION: The accounting information or the authentication failure reason is notified from a routing device 2 to the client host 3, by adding information regarding the accounting or information regarding a reason for the authentication failure of the client host 3 to a packet of a protocol based on IGMP (Internet group management protocol) or MLD (multicast listener discovery) which is a multicast control packet between the client host 3 and the routing device 2.

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