Open source rides to the rescue
Traffic on the network had been increasing all week, but the intrusion-detection system wasn’t picking up anything malicious. Whatever traffic was traversing the network was considered okay.
The servers and desktop systems were all at current patch levels, switches at current IOS levels. Sophos Anti-Virus wasn’t showing any virus activity. We hadn’t installed any new devices on the network either, yet something had changed and was causing problems.
We found that several users were running something called Netropa, a freely downloadable newsfeed application. We couldn’t identify any one system on the network that was transmitting unusually large amounts of data. We were stumped.
The answer, as it so often has been since I entered the public sector, was to turn to open-source. I went on a quest to find an open-source tool that would allow me to be notified when a change on the network occurred, malicious or not.
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