Though you can usually manage your network settings via the GUI in most Linux distros these days, it's always good to be familiar with the command-line tools. So we're going to review some select commands from a couple of tools that are typically included in the popular Linux distros. Remember, if you want full details on the tool and its options, refer to its man page: type man followed by the tool name. Now bring up a terminal and let's get started!
Read the full thing at http://www.linuxplanet.com/linuxplanet/tutorials/7044/1/