December 2000
Intermediate to advanced
784 pages
20h 54m
English
Content preview from Network Programming with Perl
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Using Multicast
The remainder of this chapter shows you how to use multicasting in Perl applications.
Sending Multicast Messages
Sending a multicast message is as straighforward as creating a UDP socket and sending a message to the desired multicast address. Unlike broadcasting messages, to send multicast messages you don't have to get permission from the operating system first.
Recall from Chapter 20 that we were able to identify all the hosts on the local area subnet by pinging the broadcast address. We can use the same trick to identify multicast-capable hosts by sending a packet to the all-hosts group, 224.0.0.1:
% ping 224.0.0.1 PING 224.0.0.1 (224.0.0.1): 56 data bytes 64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=1.0 ms 64 bytes from ...
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