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When ports on a host start opening and closing like window shutters in a gale, it’s time for admins to pay attention.
Last month, I took a look at some features of the new Nmap 4.00. This topic is far too interesting for just one month, however, so this month, I’ll describe Cancerbero [1], a server monitoring tool based on Nmap. The tool, which was written in Perl, leverages the power of Nmap to port scan your network devices. Cancerbero logs the results in a database and uses a small-footprint PHP front-end to make the results more readable. The benefits are obvious: I get an at-a-glance overview of open ports, and I can easily see which ports are open or closed.
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