PasTmon - The Passive Application Response Time Monitor

Measure the transaction response times of your web and application servers. Perform continuous passive monitoring of network traffic. Record historical data of measurements in a backend database and present via a PHP based web front-end.

PasTmon is a passive network traffic analyser that can measure user transaction response times of web, ftp, dns, irc, pop, mail, postgresql, and mysql database servers. You can even define your own signature rules to monitor custom TCP based applications. PasTmon is a server administrator's tool for measuring application performance and response times.

PasTmon is Open Source and licensed under the GNU General Public License. It is available for Linux/Unix systems, is free to download, use and tailor to your needs.