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Multicasting allows a host to send data packets across
the Internet to a set of hosts that can be on different,
geographically dispersed subnets. The source host sends
data to a pseudo destination called a multicast group,
and does so efficiently, using less bandwidth than unicast
or broadcast traffic. Unlike unicast transmission, which
would copy a packet to send it to multiple destinations,
multicast sources send a packet only once.
Multicast routers connected to subnets use multicast
group membership protocols like IGMP to discover which
local hosts are members of which multicast groups, and
to deliver multicasted packets to member hosts.
Current applications of multicasting include email
distribution lists, routing information flooding, and
web-based training seminars and voice/video conferences.
This application note describes how to use a 4-port
Gigabit Ethernet module to simulate 3 different hosts
and test a SUT’s implementation of IGMPv3 Source
Specific Multicast and Include/Exclude filters.
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Network Services 
