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Linux Firewall

Understanding what a firewall is and how it works: A firewall is a gateway. It follows pre-configured rules that allow certain traffic to pass through from the internet to the private network and bl

 · 2 min read

A step-by-step guide on how to configure the firewall in Linux:

Beef-up basic Linux security

Ensure that the firewall has all the support it needs with a 100% secure Linux machine. 

To do this, ensure you have all the latest security updates installed for your version of Linux.

Decide how you want to protect your server:

While Iptables is generally where the Linux community looks to configure a firewall, there are easier options available that are also free for use. Here are some that we would recommend:


-ClearOS is extremely easy-to-use. It is suitable for those who prefer an easy-to-follow UI AND also for geeks who would like to talk to it through the command-line interface

Post a 10-minute installation time, you are asked to reboot and are given all the information and support required to manage your firewall as easily as possible.


-OPNsense offers several advanced features not usually found in free firewalls like ‘forward caching proxy’ and ‘intrusion detection’.

-It supports the use of OpenVPN. To know how useful OpenVPN is, read more here

-It uses an Inline Intrusion Prevention System which is a powerful form of Deep Packet Inspection. Here, instead of just blocking an IP address or port, the firewall inspects individual data packets or connections and stops them before they reach the sender if found malicious

3.ConfigServer Firewall (CSF):

-CSF is an advanced firewall suite for Linux systems has the Login Failure Daemon (LFD) process that regularly scans for failed login attempts (or “Brute-force attacks”) on your Server and takes action against the offending IP Addresses very quickly

-CSF can be managed through the Command Line Interface and its front-end is accessible by the root account through cPanel, DirectAdmin and Webmin which makes configuring and managing the firewall very simple


Carol Kamuchira

Digital Marketing Rep

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