As a Linux administrator for over ten years, my primary responsibility has always been the security management of Linux servers. Firewalls play a critical role in securing Linux systems and networks.
They act like a security guard between internal and external networks by controlling and managing incoming and outgoing network traffic based on a set of predefined rules. These firewall rules allow legitimate connections and block those that are not specified.
With numerous open-source firewall applications available today, choosing the right one for your needs can be challenging. In this article, we will explore ten of the most popular open-source firewalls that can help secure your Linux servers in 2024.