Overview

Let’s sneak a peek at the top open source firewalls in this tutorial. A firewall is a security software program that monitors outgoing and incoming traffic of the network based on a set of network rules.
It allows or obstructs the network traffic based on the set rules.

A firewall program is an essential component in the computer network to safeguard against unauthorized access to a network resource in a network system. Malicious network intruders are supposed to be blocked with well-defined network rules.

Open Source Firewalls

Some of the firewall software programs are as follows:

• pfSense
• OPNsense
• Untangle
• IPCop Firewall
• Smoothwall
• iptables

pfSense

pfSense is free network firewall distribution based on the FreeBSD operating system.

Official website: https://www.pfsense.org

Untangle

Untangle NG(Next-Generation) firewall is an OSI layer 7 application layer firewall with built-in OpenVPN that filters traffic based on IP address and ports, Active Directory users and groups, etc.

Official website: https://www.untangle.com