IMGP Information - Terms & Descriptions which may be useful in better undertstanding your router.

IGMP Information
Internet Management Group Protocol. Terms & Descriptions which may be useful in better undertstanding your router.

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Definitions of IGMP on the Web:

The standard for IP Multicasting on the Internet. It's used to establish host memberships in particular multicast groups on a single network. The particulars of the protocol allow a host to inform its local router, using Host Membership Reports, that it wants to receive messages addressed to a specific multicast group.
www.nve.vt.edu/cias/Resources/glossary.htm

Internet Group Management Protocol - just knowing that this exists is all that is needed for this paper. It is not discussed in detail.
mike.passwall.com/networking/termd.html

(Internet Group Management Protocol) snooping-as implied by the name, is a feature that allows SmartDSLAM to "listen in" on the IGMP conversation between hosts and routers. GVRP :Generic Attribute Registration Protocol (GARP) VLAN Registration Protocol (GVRP)-With GVRP, SmartDSLAM can exchange VLAN configuration information with other GVRP switches, prune unnecessary broadcast and unknown unicast traffic, and dynamically create and manage VLANs on switches connected through 802.1Q trunk ports.
www.c-com.com.tw/support/c-com-support-glossary.htm

This protocol is used in multicasting.
www.novastars.com/satellite-tv-recivers/video-glossary.htm

(Internet Group Management Protocol) A protocol that hosts use to keep local routers informed of their membership in multicast groups. When all hosts leave a group, the router no longer forwards datagrams that arrive for the group.
www.hscgroup.co.uk/i.html

A network control protocol running on top of the IP protocol. It is used by Internet hosts to maintain information related to multicast. All machines that want to use the multicast have to have the IGMP implemented.
www.100best-web-hosting.com/termi.html

The Internet Group Management Protocol 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.
en.wikipedia.org/wiki/IGMP