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.

A busy proxy server is something that no self-respecting admin should leave to its own devices. The Squid logfile analyzer, dubbed Sarg by its author, helps you keep your Squid servers on track.

Some people don’t mind leaving traces of their IP address wherever they go, others prefer to use a tool like The Onion Router.