Fun with Port Scanning | In Depth Look

Posted on: January 13, 2012

Posted in: Featured, IN DEPTH LOOK, Video

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Fun with Port Scanning | In Depth Look

It’s just good computer hygiene to check what ports you have open from time to time. And its also a good security practice. In this week’s episode, we’re going to have FUN with port scanning… Yes really!

How to check your own computer, other systems on your LAN, and audit your firewall from an outside host.

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Self Audit:

nmap localhost

Find all active IPs on your network:

nmap -sP 10.1.10.*

Get info about remote host ports and OS detection

nmap -sS -P0 -sV -O

Check your router/firewall from the outside:

All web servers on my local network:

nmap -sT -p 80 -oG – 10.1.10.* | grep open

Extra Fun:

  • Anonymous

    Excellent information in this episode, and well-portrayed in what I thought was very clear, simple, and easy to understand. Great work! I’d just like to note that I tried using nmap on OS X Snow Leopard, and the utility does not seem to be installed out of box. I had to grab it from nmap.org (the installer is located toward the bottom of the downloads page, where it lists binaries). The installer also comes with Zenmap, the GUI front-end to use nmap, but I found that it crashes before opening. Just as well, though – nmap works great from Terminal! Thanks for the episode, Chris. :-)

  • Anonymous

    I had intended to mention you gotta download it, and it totally slipped my mind. It’s one of those tools I always install, so I did not even think about it until AFTER I shot the episode! lol

    Thanks!
    -Chris

  • http://twitter.com/Gilmoro Landon L. Gilmore

    Chris, I assume you were recording the command line stuff from your mac.  How did you get Terminal do look like that?

  • Alphonsus

    I see you’re using sudo in the video, but left it out on the show notes.  You might want to state root privileges are required for some of the switches.

    Landon, 
    it appears to Chris is using the Homebrew setting for his terminal.  TerminalPreferences…StartupOn startup, open: New window with settings:
    Change Basic to homebrew.

  • Taylor Everding

    I think he was using cathode 
    http://www.secretgeometry.com/apps/cathode/

  • Anonymous

    Yep! I wanted a retro look to fit with the overall look of the episode.. But I like it so much I might keep using it. Just a fun way to make the Terminal look a bit more interesting IMHO. Which is a bit hard too pull off for video!