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   –...

What is UFW? UFW, or Uncomplicated Firewall, is a front-end to iptables. Its main goal is to make managing your firewall drop-dead simple and to provide an easy-to-use interface. It’s well-supported and popular in the Linux community—even installed by default in a lot of distros. As such, it’s a great way to get started securing your sever. Before We Get Started First, obviously, you want to make sure UFW is installed. It should be installed by default in Ubuntu, but if for some reason it’s not, you can install the package using aptitude or apt-get using the following commands: sudo aptitude install ufw or sudo apt-get install ufw Check the Status You can check the status of UFW by typing:sudo ufw status Right now, it will probably tell you it is inactive. Whenever ufw is active, you’ll get a listing of the current rules that looks similar to this: Status: active To Action From -- ------ ---- 22 ALLOW ...