Monitoring and Diagnosing Networks
It is important to monitor the network and make sure the traffic on it belongs there. In this section, we’ll explore basic network monitors as well as intrusion detection systems.
Network Monitors
Network monitors, otherwise called sniffers, were originally introduced to help troubleshoot network problems. Simple network configuration programs like IPCONFIG don’t get down on the wire and tell you what is physically happening on a network. Instead, examining the signaling and traffic that occurs on a network requires a network monitor. Early monitors were bulky and required a great deal of expertise to use. Like most things in the computer age, they have gotten simpler, smaller, and less expensive. Network monitors ...
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