Follow along with us now as we review some of the network diagnostic tools in Linux and see how to use them to get answers to the question "what's wrong with my network?"

Nmap, or the Network Mapper, is a powerful command-line tool for diagnosing network problems, finding security vulnerabilities, and host of other uses. Its many options and scanning methods can be daunting to even the most experienced of end users, but nmapFE is a graphical interface for nmap that makes it easy to use even the most powerful aspects of the network mapper, and can be a life-saver when you run into networking problems.

This article takes you step-by-step through several good, but too often neglected, techniques for command-line operations. Learn about common errors and how to overcome them, so you can learn exactly why these UNIX habits are worth picking up.

Adopt 10 good habits that improve your UNIX® command line efficiency -- and break away from bad usage patterns in the process. This article takes you step-by-step through several good, but too often neglected, techniques for command-line operations. Learn about common errors and how to overcome them, so you can learn exactly why these UNIX habits are worth picking up.

Is your Net connection slow? Ever wonder what the hell’s going down the wire? Here are five free and effective tools to diagnose network traffic issues.

Examine how to use the Network Information Service (NIS) to share core databases between Linux® and UNIX®, and how to use the Network File System (NFS) to share file systems, both with direct links and through the automounter.

Network Security Toolkit is one of many live CD Linux distributions focusing on network monitoring, analysis, and security. NST was designed to give network security administrators easy access to a comprehensive set of open source network applications, many of which are among the top 100 security tools recommended by insecure.org.

As a follow-up to Michael Stutz's excellent article, this article provides 10 more good habits to adopt that will improve your UNIX® command-line efficiency. Learn about common errors and how to overcome them, and discover exactly why these 10 UNIX habits are worth picking up!

Wireshark is a network protocol analyzer (or "packet sniffer") that can be used for network analysis, troubleshooting, software development, education, etc. This guide shows how to install and use it on an Ubuntu 9.10 desktop to analyze the traffic on the local network card.