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14.1 Definitions of IGMP
In traditional Internet, Unicast was used to send the data packet all receivers in the Internet, then
together with increased nodes in the Internet, the packets sent out will increase in linearity. The
same transmission (e.g. Internet video conference and live program for different nodes receive
the same data) will increase the possibilities by host machine, route devices, and bandwidth
resource. Together with increased Internet video conference and living video, in order to improve
resource using rate, multicast has been the transmission method in multipoint communications
more and more. Under the condition that need send multimedia information (such as living audio
and video) for several host machines, it is not the best way to send data for each supplicant
separately, but if you make use of broadcast the transmission host machine and that of
supplicant are not in the same sub-net, so it is not a good solution. The following Figure14-1
makes comparison for Unicast and Multicast
Figure 14-1 Comparison Between Unicast and Multicast Information Tranference
From Figure 14-1 you can see that get use of Unicast to forward data to three ends, but
Multicast just needs one data packet to Multicast group if there are three same data packets, in
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