How to open your firewall remotely only for you -knockd-

One of the beauties about Linux is that it is really easy to administer it remotely, but that is also one of the major concerns about Linux security, if you have weak passwords, you are exposed to attacks, there are lots of ways to protect yourself, one of the easiest is to close the firewall, and only permit access to port 22 from some specific IPs, but this is not an option if you travel a lo

Howto: Delete Files Permanently and Securely in Linux


We all know that when you simply delete a file, it's possible to recover it later. Sometimes this is useful, if you accidentally delete something important; but usually this is a problem, and you really want that file gone forever. This howto explains how to delete a file in linux securely and permanently, so it can never be recovered.


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