The Sysadmin’s Daily Grind: Cancerbero

RATTLING PORTS

Author(s):

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.

Read full article as PDF:

Charly_Column.pdf (113.34 kB)

Related content

  • Charly's Column

    Many tools keep growing with each new version, but Nmap 4.00 has lost weight thanks to the Diet-Nmap project. The latest incarnation of Nmap is not only quicker, it is also more frugal with memory.

  • Charly's Column

    On a trip to Berlin, Charly discovers that the nmap port scanner has a new cousin who enjoys spying on phones – smap scans networks for VoIP devices.

  • Charly’s Column: PortSentry

    To celebrate 10 years of his column, Charly sets up a sensitive detector that measures the cosmic background radiation of the Internet.

  • Charly's Column

    Incoming TCP connections do not always end up where they are supposed to. A freely configurable redirector points digital debris in the direction of a new and better place.

  • Charly's Column

    Checking email for viruses is typically the domain of the SMTP gateway or a server directly downstream of it. In this month’s column, Charly decides to move this protection to the other side – that is, to the client connections
    with their SMTP and POP servers.

comments powered by Disqus

Direct Download

Read full article as PDF:

Charly_Column.pdf (113.34 kB)

News