IGMP Application Guide

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IGMP (Internet Group Management Protocol) is a communications protocol used to manage the membership of Internet Protocol multicast groups. IGMP is used by IP hosts and adjacent multicast routers to establish multicast group memberships. It is an integral part of the IP multicast specification, like ICMP (Internet Control Message Protocol) for unicast connections. IGMP can be used for online video and gaming, and allows more efficient use of resources when supporting these uses.