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The Penguin's Practical Network Troubleshooting Guide
Three Essential Linux Networking Applications
December 15, 2008
LinuxPlanet Classics: Whether you're trying to debug your own network, or persuade your service provider that yes, the problem really is theirs, Linux has all the tools you need to hunt down and pinpoint network problems.
Linux has everything you need to do any kind of networking, plus it has eleventy-eight hundred different software utilities for network monitoring and troubleshooting. Today we'll learn how to pinpoint connectivity problems and how to map your network and all running services. This is handy not only for keeping tabs on everyday activities, but also to catch users running illicit hosts and services.
There are so many different software utilities it's easy to get lost and not know what to use, and there is a lot of overlap in functionality. So we're going to focus on ping, tcptraceroute, and nmap. Doubtless someone will tell you their own favorite way of doing things that is different from yours, and it is always good to know these things, but it doesn't mean they are superior. Just different.