Internet Group Management Protocol Version 3 (IGMPv3)

Internet Group Management Protocol Version 3 (IGMPv3)
Multicasting is a rapidly evolving world of multicast traffic flows. No surprise, then, that
version 2 of IGMP is not without its own flaws.
Known problems with IGMPv2 (which were not obvious in the past) include
 The possibility of two multicast applications being “live” at the same time with the same
multicast address
 The lack of knowledge about the multicast server source address causing routing tree instability
 The ease with which multicast groups can be subjected to denial-of-service attacks (or even
simple spamming)
Internet Group Management Protocol version 3 (IGMPv3) addresses these problems
specifically by allowing hosts to specify the list of hosts from whom they want to receive
traffic, blocking traffic from other hosts transmitting the same stream, and allowing hosts
to block packets that come from sources sending unwanted traffic.
Only two types of message exist in IGMPv3: Membership Query and Membership Report.