The PasTmon passive traffic monitor keeps an eye on your network, recording which clients are interacting with which services, when and how long things took. You can then use the application's PHP Web interface to investigate these figures to see if any host is connecting to Web services that it shouldn't, or is contacting services suspiciously more frequently than you would expect for normal operation, or when response times become excessively long. Knowing what traffic is going on your network is an important security practice. This article looks at the traffic monitoring software called PasTmon. Do you have any favorite security tools that you use on your network?

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