Chapter 29
ICMP
Objectives
Upon completion of this chapter, you will be able to answer the following questions:
How is ICMP used to test network connectivity?
How do you use ping and traceroute utilities to test network connectivity?
Introduction (29.0)
Welcome to ICMP! Imagine that you have an intricate model train set. Your tracks and trains are all connected and powered up and ready to go. You throw the switch. The train goes halfway around the track and stops. You know right away that the problem is most likely located where the train has stopped, so you look there first. It is not as easy to visualize this with a network. Like a train, packets might not make it to their destination. Fortunately, there are tools to help you locate problem ...
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