Internet Group Management Protocol

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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, operating above the network layer, though it doesn't actually act as a transport protocol[1]. It is analogous to ICMP for unicast connections. IGMP can be used for online streaming video and gaming, and allows more efficient use of resources when supporting these uses. IGMP does allow some attacks[2] [3] [4] [5], and firewalls commonly allow the user to disable it if not needed.

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A network designed to deliver a multicast service (like video) using IGMP might use this basic architecture:

IGMP architecture

IGMP is used both by the client computer and the adjacent network switches to connect the client to a local multicast router. Protocol Independent Multicast (PIM) is then used between the local and remote multicast routers, to direct multicast traffic from the video server to many multicast clients.

There are three versions of IGMP, as defined by "Request for Comments" (RFC) documents of the Internet Engineering Task Force (IETF). IGMP v1 is defined by RFC 1112, IGMP v2 is defined by RFC 2236 and IGMP v3 is defined by RFC 3376.

  1. ^ Network Sorcery - IGMP
  2. ^ Spoofed IGMP report denial of service vulnerability.
  3. ^ Fragmented IGMP packet may promote "Denial of Service" attack.
  4. ^ IGMP Security Problem Statement and Requirements.
  5. ^ Microsoft Security Bulletin MS06-007: Vulnerability in TCP/IP Could Allow Denial of Service (913446).

Retrieved from "http://en.wikipedia.org/wiki/Internet_Group_Management_Protocol"
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