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IGMP (Internet Group Message Protocol)
Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.
Multicast receivers must indicate their desire to be included in a multicast session. This is done with IGMP, a protocol that runs between hosts and their immediately neighboring multicast routers. Hosts use the protocol to inform the local multicast router that they want to receive transmissions from a particular multicast group, or that they no longer want to receive messages from a group. See "Multicasting."
Copyright (c) 2001 Tom Sheldon and Big Sur Multimedia.