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Topic: IGMP

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	IGMP, Internet Group Management Protocol
		IGMP is an asymmetric protocol and is specified here from the point of view of a host, rather than a multicast router.
		IGMP is used between hosts and gateways on a single network to establish hosts' membership in particular multicast groups.
		IGMP is a protocol used between hosts and multicast routers on a single physical network to establish hosts' membership in particular multicast groups.
	www.networksorcery.com /enp/protocol/igmp.htm (3519 words)

	Internet Group Management Protocol
		The Internet Group Management Protocol (IGMP) is used between IP hosts and their immediate neighbor multicast agents to support the creation of transient groups, the addition and deletion of members of a group, and the periodic confirmation of group membership.
		IGMP [RFC 1112] is a protocol used between hosts and gateways on a single network to establish hosts' membership in particular multicast groups.
		IGMP is a protocol used between hosts and multicast routers on a single physical network to establish hosts' membership in particular multicast groups.
	www.ebroadcast.com.au /lookup/encyclopedia/ig/IGMP.html (3713 words)

	IGMP (Site not responding. Last check: 2007-10-17)
		IGMP messages are used by multicast routers to track group memberships on each of its networks.
		The group address of the query is set to 0, the TTL field is set to 1, and the destination IP address is 224.0.0.1 which is the all hosts group address which address all the multicast capable routers and hosts on a network.
		IGMP message formats are encapsulated in an IP datagram which contain a time to live (TTL) field.
	www.comptechdoc.org /independent/networking/guide/netigmp.html (436 words)

	Chapter 13. IGMP: Internet Group Management Protocol
		IGMP messages are specified in the IP datagram with a protocol value of 2.
		An IGMP type of 1 is a query sent by a multicast router, and 2 is a response sent by a host.
		IGMP messages are used by multicast routers to keep track of group membership on each of the router's physically attached networks.
	members.tripod.com /~azeemk/Stevens/igmp_int.htm (2466 words)

	White Papers: Internet Group Multicast
		IGMP is not used by the application for actual voice/video transfer, but rather as a membership mechanism for joining or participating in multicasts.
		IGMP is a session-layer protocol used to establish membership in a multicast group.
		IGMP is used to gain membership in a multicast session.
	www.enterasys.com /products/whitepapers/igmp (2986 words)

	[No title]
		In this model, ICMP and (for level 2 hosts) IGMP are considered to be implemented within the IP module, and the mapping of IP addresses to local network addresses is considered to be the responsibility of local network modules.
		The IP module must also be extended to implement the IGMP protocol, specified in Appendix I. IGMP is used to keep neighboring multicast routers informed of the host group memberships present on a particular local network.
		To support IGMP, every level 2 host must join the "all-hosts" group (address 224.0.0.1) on each network interface at initialization time and must remain a member for as long as the host is active.
	www.ietf.org /rfc/rfc1112.txt (4943 words)

	GateD Configuration Guide - IGMP Configuration
		IGMP was primarily designed for hosts on multi-access networks to inform locally attached routers of their group membership information.
		IGMP must be enabled before one of the IP Multicast routing protocols are enabled.
		IGMP Host Membership Queries are sent if this router is elected the designated querier for the LAN.
	madhaus.utcs.utoronto.ca /gated/config_guide/igmp_stmt.html (487 words)

	IGMP Denial of Service Vulnerability (Site not responding. Last check: 2007-10-17)
		IGMP, in a bid to optimize its functionality uses a report suppression mechanism to prevent redundant IGMP member reports from being sent to the querier router.
		Host H1 is a member of the multicast group 230.0.0.1 and is receiving traffic from the designated router R. R sends out periodic IGMP membership query messages soliciting for membership reports from the hosts in the network it is serving.
		IGMP version 2 was used for testing the vulnerability.
	www.cs.ucsb.edu /~krishna/igmp_dos (796 words)

	Introduction
		As showed above, IGMP is only concerned with the forwarding of multicast traffic from the local router to group members on directly-attached subnetworks, not concerned with the delivery of multicast packets between neighboring routers or across an internetwork.
		The purpose of IGMP is to let multicast routers learn which groups have members on each of their attached physical networks, such that their IP will forward correspondent multicast data packets to the networks.
		IGMP should be implemented in both multicast routers and host, and each router and host.
	www.cs.columbia.edu /~hgs/teaching/ais/1998/projects/IGMP/report.html (5061 words)

	Future Software Limited - IGS (IGMP Snooping)
		IGMP is the protocol used by IPv4 systems to report their IP multicast group memberships to neighboring multicast routers.
		Version 3 of IGMP adds support for "source filtering", that is, the ability for a system to report interest in receiving packets only from specific source addresses, or from all but specific source addresses, sent to a particular multicast address.
		Aricent IGMP reduces the time to market for OEMs and VARs who wish to incorporate the IGMP functionality into their switching/routing devices.
	www.futsoft.com /igmp.htm (240 words)

	IGMP introduction
		Routers use periodically the IGMP to check whether the known group members are active or not.
		The IGMP version 1 has a fixed-size message with no optional data and messages are encapsulated in IP datagrams, with an IP protocol number of 2.
		IGMP messages are used by routers to keep track of group memberships in their immediately connected subnetwork.
	www.et.put.poznan.pl /tcpip/igmp/igmp_intro.htm (1336 words)

	Configuring IGMP Snooping and MVR
		When IGMP router suppression is enabled (the default), the switch sends the first IGMP report from all hosts for a group to all the multicast routers.
		If the IGMP report matches one of the configured IP multicast group addresses, the switch CPU modifies the hardware address table to include this receiver port and VLAN as a forwarding destination of the specified multicast stream when it is received from the multicast VLAN.
		If an IGMP profile denying access to a multicast group is applied to a switch port, the IGMP join report requesting the stream of IP multicast traffic is dropped, and the port is not allowed to receive IP multicast traffic from that group.
	www.cisco.com /univercd/cc/td/doc/product/lan/cat3560/12225see/scg/swigmp.htm (6754 words)

	[No title] (Site not responding. Last check: 2007-10-17)
		IGMP TYPE NUMBERS - per [RFC3228, BCP57] (last updated 27 June 2005) The Internet Group Message Protocol (IGMP) has many messages that are identified by a "type" field.
		Note that the original definition of IGMP in [RFC1112] divided this field into two 4-byte values, "version" and "type".
		[RFC3228] Fenner, W., "IANA Considerations for IGMP", RFC 3228, BCP 57, [BCP57] February 2002.
	www.iana.org /assignments/igmp-type-numbers (169 words)

	Datacom-IGMP Overview
		The software snoops IGMP v1, v2, and v3 packets and populates the Multicast-MAC forwarding entries used by the switching NPU or silicon.
		IGMP snooping implementation enables Layer2 switches in the network, to snoop into IGMP control protocol packets that are exchanged between downstream hosts and upstream L3 switches.
		By snooping those packets, the L2 switches generate the L2 MAC forwarding table that will be used for further switching sessions and regulate the multicast traffic from flooding the Layer2 segment of the network.
	www.hssworld.com /datacom/IGMP_overview.htm (135 words)

	ProCurve Networking by HP - Information Library
		IGMP manages multicast traffic throughout networks with the use of special multicast queriers and hosts that support IGMP.
		IGMP identifies members of the multicast group per "subnet" and provides mechanisms (messages) by which queriers and hosts can join and leave multicast groups.
		Notice that Switch #1 without IGMP does not differentiate IP multicast group members from non-members, thus two PCs on Net A that are not video clients receive large amounts of unwanted multicast traffic.
	www.hp.com /rnd/library/ethernet_switching/igmp.htm (784 words)

	IGMP Version 3
		IGMP Version 3 (IGMPv3) adds support for "source filtering," which enables a multicast receiver host to signal to a router which groups it wants to receive multicast traffic from, and from which source(s) this traffic is expected.
		In this case, either IGMP snooping may be disabled on the switch or the router may be configured for IGMPv2 on the interface (which would remove the ability to use SSM for host applications that cannot resort to URD or IGMP v3lite).
		The IGMP Version 3 feature is related to the existing Source Specific Multicast, URD, and IGMP v3lite features, which are documented in the Cisco IOS Release 12.1(5)T Source Specific Multicast with IGMPv3, IGMP v3lite, and URD feature module.
	www.cisco.com /univercd/cc/td/doc/product/software/ios121/121newft/121t/121t5/dtigmpv3.htm (2044 words)

	Internet Group Multicast Protocol - (IGMP)
		Like ICMP, IGMP is implemented as part of the IP software, but runs as a higher level protocol in that IGMP datagrams are encapsulated within the IP datagram's payload.
		IGMP is now in it's second revision as a protocol.
		The IGMP messages are used to learn which hosts are part of which multicast groups.
	www.inetdaemon.com /tutorials/internet/igmp/index.shtml (113 words)

	Internet Group Management Protocol : IGMP (Site not responding. Last check: 2007-10-17)
		A host should confirm that a received Report has the same IP host group address in its IP destination field and its IGMP group address field, to ensure that the host's own Report isn't cancelled by an erroneous received Report.
		If IGMP isn't implemented, a host SHOULD still join the "all- hosts" group (224.0.0.1) when the IP layer is initialized and remain a member for as long as the IP layer is active.
		Varying this setting allows IGMPv2 routers to tune the "leave latency" (the time between the moment the last host leaves a group and when the routing protocol isn'tified that there are no more members).
	www.termsdefined.net /ig/igmp.html (3854 words)

	IGMP Snooping
		IGMP multicast routers periodically send Host Membership Query messages (hereinafter called Queries) to discover which host groups have members on their attached local networks.
		Without IGMP snooping, multicast traffic is treated in the same manner as broadcast traffic, that is, it is forwarded to all ports.
		As long as the IGMP snooping switch receives this Leave Group message, it sends a IGMP group specified query message to determine if any device behind that port is interested in the specific multicast group traffic.
	global.zyxel.com /support/supportnote/ves1012/app/igmpsnoop.htm (1360 words)

	[No title]
		IGMP may also be used between routers, but such use is not specified here.
		All IGMP messages described in this document are sent with IP TTL 1, and contain the IP Router Alert option [RFC 2113] in their IP header.
		The group address in the IGMP header must either be zero (a General Query) or a valid multicast group address (a Group-Specific Query).
	www.rfc-editor.org /rfc/rfc2236.txt (5613 words)

	IGMP Snooping with Multicast Message Filtering or Pruning for GarrettCom 6K Switches
		IGMP is a standard defined in RFC1112 for IGMPv1 and in RFC2236 for IGMPv2.
		IGMP snooping, as implied by the name, is a feature that allows an Ethernet switch to "listen in" on the IGMP conversation between hosts and routers.
		IGMP (Internet Group Management Protocol) is important in industrial networking, and may be used with some field bus protocols over Ethernet such as Allen-Bradley’s EtherNet/IP, Foundation Fieldbus HSE (High Speed Ethernet), and Siemens’ Profibus.
	www.garrettcom.com /igmp.htm (489 words)

	IGMP (Site not responding. Last check: 2007-10-17)
		The original version of IGMP was defined in [RFC 1112].
		If the igmp statement is not specified the default is igmp off; If enabled, IGMP will default to enabling all interfaces that are both broadcast and multicast capable.
		This is the interval at which IGMP Host Membership Queries are sent if this router is elected the designated querier for the LAN.
	www.gps.caltech.edu /computing/answers/GateD-Manual/node29.html (407 words)

	IGMP Protocol Overview (Site not responding. Last check: 2007-10-17)
		Internet Group Management Protocol (IGMP), documented in Appendix I of RFC 1112, allows Internet hosts to participate in multicasting.
		IGMP allows a router to determine which host groups have members on a given network segment.
		The exchange of multicast packets between routers is not addressed by IGMP.
	www.freesoft.org /CIE/Topics/82.htm (104 words)

	IGMP snooping
		IGMP leaves are now propogated through to the router which in turn sends two group-specific membership queries with a 1 second response time, and after no response is received the data flow is pruned.
		IGMP v2 is still very common, so do some testing here for basic functionality and, if the switch you are stuck with is too old or broken, it may simply not work with IGMP v3 and you'll have to force v2 (and lose the ability to do SSM).
		IGMP v2 support seems to be correct, with fast leave happening properly.
	www.columbia.edu /~alan/igmp (4366 words)

	What is Internet Group Management Protocol? - a definition from Whatis.com - see also: IGMP
		Multicasting can be used for such applications as updating the address books of mobile computer users in the field, sending out company newsletters to a distribution list, and "broadcasting" high-bandwidth programs of streaming media to an audience that has "tuned in" by setting up a multicast group membership.
		Using the Open Systems Interconnection (OSI) communication model, IGMP is part of the Network layer.
		IGMP is formally described in the Internet Engineering Task Force (IETF) Request for Comments (RFC) 2236.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci214391,00.html (304 words)

	IGMP: Internet Group Management Protocol Overview (IGMPv1 IGMPv2 IGMPv3 RFC 1112 2236 3376)
		Internet Group management protocol (IGMP), a multicasting protocol in the internet protocols family, is used by IP hosts to report their host group memberships to any immediately neighboring multicast routers.
		There are basically 5 types of messages in the IGMP that must be implemented in IGMP for the IGMP v3 functional properly and be compatible with previous versions:
		IGMP is defined by IETF (http://www.ietf.org) in RFC1112 and RFC2236, and RFC3376.
	www.javvin.com /protocolIGMP.html (404 words)

	Entête du protocole IGMP
		Vous trouverez tous les détails du protocole IGMP version 1 dans la Rfc 1112.
		Voici la structure de l'entête IGMP V2 basé sur 8 octets.
		De la même manière qu'ICMP, IGMP est un protocole de couche 3.
	www.frameip.com /entete-igmp (474 words)

	TCP / IP Suite \| RSVP \| RIP2 \| IGMP \| MARS \| PIM \| VRRP
		The Internet Group Management Protocol (IGMP) is used by IP hosts to report their host group memberships to any immediately neighboring multicast routers.
		IGMP messages are encapsulated in IP datagrams, with an IP protocol number of 2.Version 3 of IGMP adds support for source filtering.
		The Checksum is the 16-bit one's complement of the one's complement sum of the whole IGMP message.
	www.protocols.com /pbook/tcpip4.htm (1915 words)

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