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OSSEC gives system administrators and IT security pros the ability to learn an IDS for free. All you need to get started is a Linux, Unix, or BSD host.

Sensitive files need to be secured on Linux just as they do on Windows. Fortunately, installing and configuring TrueCrypt on Linux is an easy task – you can even use a shell prompt.

Introducing a new peer-to-peer networking paradigm: the "friend-to-friend" or F2F model in which all parties in a circle of trust approve and trust each other. Certificate-based authentication and strong SSL encryption are also utilized.

If you don't know your -rw-r--r-x's from your 744's, then this article is definitely for you.

SSH is a very useful and capable protocol that can be a Linux administrator's best friend. This article explains how SSH can make your IT work easier and your network more secure. It also provides all the usage options available for SSH and describes each option fully. Lastly, the article provides links to many of the other best webpages on SSH.

There is certainly no shortage of Nmap material online. This article, however, is unique because it fully describes the various Nmap command types, lists all of the Nmap command options, and provides several sample commands to practice with.

Wget can give you the ability to master the Internet by extending your download capabilities far past what your Web browser provides. You can use Wget to download all files from a website matching certain criteria, or you can use it to download an entire website itself. This article lists and describes all of Wget's usage options and provides several sample commands you can try out for yourself.

Although familiar networking utities like ping, netstat, and nslookup are available on both Linux and Windows, their respective command switches vary greatly between the two operating systems. This article lists all the networking command options available for both Linux and Windows in an easy-to-read format.

Many of the well-known Linux utilities for establishing,testing, and troubleshooting network connectivity are actually deprecated.