Briefly, an Intrusion Detection System monitors incoming packets and tries to detect both intelligent attacks and DenialOfService issues.

See: [[http://www-rnks.informatik.tu-cottbus.de/~sobirey/ids.html|rather large list of intrusion detection systems]], and an [[http://www.robertgraham.com/pubs/network-intrusion-detection.html|intrusion detection system FAQ]].

A similar idea, ExtrusionDetection monitors outgoing packets to make sure "bad traffic" does not escape, thus preventing the operator's exposure to various men with clubs and bad attitudes. --AndrewWoods

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