Many tools keep growing with each new version, but Nmap 4.00 has lost weight thanks to the Diet-Nmap project. The latest incarnation of Nmap is not only quicker, it is also more frugal with memory.

After penetrating a remote system, intruders might think they are home and dry, but AppArmor spoils the fun, locking the miscreants in a virtual cage.

If you need a tool for filtering protocols that doesn’t depend on the port, try L7, an IPTables patch that operates through regular expressions.

Webalizer is a tool for analyzing web server logfiles. A new patch lets admins see what isn’t there.

The Apache web server can fight back against DoS attacks. You just need a little help from Mod_evasive.

How does the popular Nmap scanner identify holes in network security? In this article, we examine some Nmap analysis techniques.