The Radius protocol is typically used to authenticate users in dial-up scenarios. But Radius is also useful in LAN environments: in combination with 802.1X, Radius forces users to authenticate at a low level before the switch opens up a port.

Data always seems to get lost at exactly the wrong moment, but the right backup strategy can help you restore those missing files.

When backup jobs become too challenging for a script, the daemon-based free backup tool Bacula may be the answer.

System admins routinely refer to documentation for help with obscure command line options. In this month’s Admin Workshop, we examine the programs and formats behind the command line documentation you read everyday.

Incoming TCP connections do not always end up where they are supposed to. A freely configurable redirector points digital debris in the direction of a new and better place.

Thanks to automatic hardware detection, today’s admins rarely need to configure the X window system manually. But if you want to use X11’s excellent networking capabilities and tuning options, you will certainly benefit from some background knowledge.

A proxy server provides safer and more efficient surfing. Although commercial proxy solutions are available, all you really need is Linux and an old PC in the attic.

If you need fast answers for what's inside, you can use a Bash script to obtain an inventory of hardware on your Linux system.