IP multicast provides a service that suffers from omission failures. Make a test kit, possibly based
on the program in Figure 4.17, to discover the conditions under which a multicast message is
sometimes dropped by one of the members of the multicast group. The test kit should be designed
to allow for multiple sending processes.
What will be an ideal response?
The program in Figure 4.17. should be altered so that it can run as a sender or just a receiver. A program
argument could specify its role. As in Exercise 4.3the number of messages and their size should be variable
and a sequence number should be sent with each one. Each recipient records the last sequence number from
each sender (sender IP address can be retrieved from datagrams) and prints out any missing sequence numbers.
Test with several senders and receivers and message sizes to discover the load required to cause dropped
messages.The test kit should be designed to allow for multiple sending processes.
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