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Results for Internet Group Management Protocol
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(Internet Group Multicast Protocol) The protocol that governs the management of multicast groups in a TCP/IP network. To sign up for a multicast group, a Host Membership Report is sent by a user's machine to its nearest routers, which forward that data to routers outside the local network. The routers are kept current by polling the users' machines with Host Membership Query messages. See multicast.
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| 5. Application layer |
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| 1. Physical layer |
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Ethernet physical layer · Modems ·
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G.709 · OFDM ·
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The Internet Group Management Protocol (IGMP) 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 for unicast connections. IGMP can be used for online video and gaming, and allows more efficient use of resources when supporting these uses. IGMP does allow some attacks[1] [2] [3] [4], and firewalls commonly allow the user to disable it if it will not be needed.
A network designed to deliver a multicast service (like video) using IGMP might use this basic architecture: 
There are three versions of IGMP. IGMP v1 is defined by RFC1112, IGMP v2 is defined by RFC2236 and IGMP v3 is defined by RFC3376.
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