December 2000
Intermediate to advanced
784 pages
20h 54m
English
Content preview from Network Programming with Perl
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Chapter 21. Multicasting
In the previous chapter, we discussed using broadcasting to transmit a UDP message to all hosts on the local area network. The examples in that chapter revealed two of broadcasting's greatest limitations: the fact that it cannot be routed beyond the local subnet and its inability to be targeted to selected hosts. Broadcasting is strictly an all-or-nothing affair and works only across the local subnetwork.
This chapter discusses multicasting, a newer technology designed specifically for streaming video, audio, and conferencing applications. Unlike broadcasting, multicast messages are routable; that is, they can be transmitted across subnet boundaries or even across the Internet. Furthermore, multicasting gives you great ...
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