“Monitoring traffic on your network is only as important as the
data and or computers you want to protect. Understanding how to do
basic network troubleshooting will save you both in wasted time and
money. Every Linux operating system comes with a number of command
line tools to help you diagnose a network problem. In addition,
there are any number of open source tools available to help you
track down pesky network issues.“In this article we’ll take a look at what’s available from the
command line and from freely available applications. Knowing a few
simple commands and when to use them will help you get started as a
network diagnostic technician. We’ll use Ubuntu 10.04 desktop as
our test platform, although all of these work in other distros as
well.”