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7 - Multicast and realtime service

Published online by Cambridge University Press:  05 June 2012

Shivendra S. Panwar ,
Shiwen Mao ,
Jeong-dong Ryoo  and
Yihan Li
Shivendra S. Panwar
Affiliation:
Polytechnic University, New York
Shiwen Mao
Affiliation:
Polytechnic University, New York
Jeong-dong Ryoo
Affiliation:
Electronics and Telecommunications Research Unit, South Korea
Yihan Li
Affiliation:
Polytechnic University, New York
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Summary

We are now in a transition phase, just a few years shy of when IP will be the universal platform for multimedia services.

H. Schulzrinne

Objectives

  • Multicast addressing.

  • Multicast group management.

  • Multicast routing: configuring a multicast router.

  • Realtime video streaming using the Java Media Framework.

  • Protocols supporting realtime streaming: RTP/RTCP and RTSP.

  • Analyzing captured RTP/RTCP packets using Ethereal.

IP multicast

IP provides three types of services, i.e., unicast, multicast, and broadcast. Unicast is a point-to-point type of service with one sender and one receiver. Multicast is a one-to-many or many-to-many type of service, which delivers packets to multiple receivers. Consider a multicast group consisting of a number of participants, any packet sent to the group will be received by all of the participants. In broadcasts, IP datagrams are sent to a broadcast IP address, and are received by all of the hosts.

Figure 7.1 illustrates the differences between multicast and unicast. As shown in Fig. 7.1(a), if a node A wants to send a packet to nodes B, C, and D using unicast service, it sends three copies of the same packet, each with a different destination IP address. Then, each copy of the packet will follow a possibly different path from the other copies. To provide a teleconferencing-type service for a group of N nodes, there need to be N(N - 1)/2 point-to-point paths to provide a full connection.

Type
Chapter
Information
TCP/IP Essentials
A Lab-Based Approach
 , pp. 134 - 158
Publisher: Cambridge University Press
Print publication year: 2004

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