| | IGMP (Internet Group Management Protocol) from FutureSoft (Site not responding. Last check: 2007-10-12) |
 | | 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. |
 | | This information is used by multicast routing protocols to avoid delivering multicast packets from specific sources to networks where there are no interested receivers. |
| www.futsoft.com /igmpv3.htm (240 words) |