The
Internet Group Management Protocol (IGMP) is a basic
multicast protocol of the
IP standard. It is defined in
RFC 1112 (Version 1),
RFC 2236 (Version 2) and
RFC 3376 (Version 3).
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 for simple IP.
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