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The Practice of Network Security Monitoring by Richard Bejtlich

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Chapter 1. Network Security Monitoring Rationale

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This chapter introduces the principles of network security monitoring (NSM), which is the collection, analysis, and escalation of indications and warnings to detect and respond to intrusions. NSM is a way to find intruders on your network and do something about them before they damage your enterprise.

NSM began as an informal discipline with Todd Heberlein’s development of the Network Security Monitor in 1988. The Network Security Monitor was the first intrusion detection system to use network traffic as its main source of data for generating alerts, and the Air Force Computer Emergency Response Team ...

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