netwyman

Linux Firewall Tools The Linux kernel is part of every Linux distribution. This also includes a Linux firewall called   netfilter . You can control the Linux Firewall with the Command Line Utility   iptables . Debian-based distributions like Ubuntu or Knoppix have no predefined rules during the installation, so everything is allowed by default. With Enterprise Linux distributions such as Fedora, CentOS or RedHat, use ports have to be opened manually. The configuration of the Linux firewall can be adapted to your needs using   iptables . However, the syntax and handling of   iptables   is relatively complex, so there are several tools / scripts to configure   iptables . We will introduce you to a small selection here. Tools for the command line to configure your Linux firewall Arno’s Firewall   – Secure firewall for single and multi-homed systems. Very easy to configure, handy to manage and highly customizable. Ferm   –...

Encryption Methods Passwords are one of the most main security features used nowadays. It’s very important for you to have secure and un-guessable passwords. Most Linux distributions have passwd programs that won’t allow you to set easily guessable password plus there are many encryption software in the market that can do this. Make sure that your passwd program is always up to date and has such features. An in-depth details of encryption is beyond the scope of this article, so kindly keep reading. Encryption software is very useful and even necessary in our current time. There’re many methods of encrypting data and each method has its own characteristics. Most Linux distributions mainly use a one-way encryption algorithm, which is called Data Encryption Standard (DES) for encrypting passwords. Brute force attacks including “John the Ripper” or “Crack” can usually guess passwords unless the password is sufficiently random. PAM modules allow user to use differe...