July 2007
Beginner
347 pages
4h 40m
English
Content preview from CLI for Noobies: A Primer on the Linux Command Line
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 61. Tcpdump
Don’t worry, I’m not going to try to turn you into to a network security analyst or administrator. But if you’re interested in what’s happening under the hood on your Internet connection, this chapter will introduce you to an old and respected command-line tool. Come on, pull that many-pixeled GUI quilt off of yourself and meet me at the CLI for a quick look at tcpdump.
Using Tcpdump
Most distributions include tcpdump out of the box, and most require that you run it as root. So as superuser, simply enter tcpdump at the command line. It will take the default values and go, pumping out packets as they are received. Here’s what it looks like starting out on my desktop box:
linux: #tcpdump tcpdump: verbose output suppressed, use -v ... |
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