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I have attempted to install and run Sara, but it seems that the software is broken. I could get it to run on, but it seems that no network packets ever leave the current computer that it is installed on.

It tests for known security holes in a network. It was based on an older software SATAN. Is there another free alternative to this program?

I did not see anything listed in this thread.

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There are quite a few network security auditors out there. Some will just check if patches are up to date, others check hundreds if not thousands of settings and vulnerabilities.

Here's a short list

One which isn't on that list is metasploit. Metasploit will allow you to test if any of the machines on your network are vulnerable to a wide array of known attacks.

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Good list. I was actually looking more for free programs, but this is probably one type of software that is hard to find without some monetary support with it. – bradlis7 Jun 3 '10 at 13:53
Oh, and the list does say they are free, but most are trials. Metasploit is looking ok though. – bradlis7 Jun 3 '10 at 13:55

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