If you’re having a small computer network at home or a huge office with hundreds of desktops, cyber security is something you can never compromise on. One thing that is a quintessential part of security is something we call a firewall.

A firewall is like the security guard at your door who keeps a watch on everyone who goes in and out. By allowing only legitimate connections to pass through and blocking connections based on a certain set of rules, the firewall secures the network from most kinds of threats that lurk around on the Internet.

In case you are planning to install one on your network -- it’s never too late you know. We have here a list of some of the best Linux and BSD-based firewall distributions that you may use for free.

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