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I have been using FlowMatrix. What do others do on the cheap?

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I was thinking more of tools to analyze netflow traffic, I guess saying "network flows" made the question ambiguous. –  Tate Hansen Nov 14 '10 at 18:05

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up vote 3 down vote accepted

OSSIM has an Anomalies tab that uses Ntop and can be configured with similar data.

When I did this stuff in the past, I used Ourmon.

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WireShark is a free tool you can use to monitor network traffic. Excellent tool to see if a hidden keylogger is trying to email and /or FTP logs because it usually has the address and password in the wireshark log.

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Given that the logs are not encrypted. –  Olivier Lalonde Nov 12 '10 at 22:09

I just saw a talk at Shmoocon about the YaF and SiLK tools that looked really good. YaF is a flow collector (which can collect other interesting data as well), and SiLK is an analysis package for them. There's even a nice GUI called iSiLK.

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Here is a list of a 100 or so Network Security Tools that may be useful.

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-1 The OP is looking for a specific type of network security tool. Not just a general list. If you really feel this adds to the discussion, why not add this to your previous answer? –  Josh Brower Jan 30 '11 at 23:55

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