10 Best Open Source Firewalls for Linux in 2024

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You’ll want to ensure that your computer is secure. Even though Linux is less prone to viruses than Mac OS or Windows, it is still essential to ensure that the dreadful virus doesn’t contaminate your network or computer.

The most effective method to accomplish this, regardless of whether you’re protecting your personal computer or a collection of computers within an organization (whether commercial or home-based), is to use firewalls.

We assume you’re familiar with Iptables, the most well-known Linux command-line-based firewall. However, since Iptables are the primary protection for Linux networks and networks, we’ll explore other firewalls which can be used separately or integrated with Iptables to enhance security.

Best Open Source Firewalls for Linux in 2022

In this article, we’ll discuss in detail the best open-source firewall for Linux that can be used for home and business security options.

The following open-source firewalls include features and capabilities equivalent to commercially priced firewalls, which is why many businesses use these as their primary protection solution for less than the price.

1. IPCop Firewall

IPCop Firewall

A Linux-based open-source solution for firewall security, IPCop is a well-known solution for online security specifically designed to secure business and home networks. However, since there isn’t a graphical interface, it is necessary to use command-line technology to utilize this solution, rendering it inaccessible to users with disabilities.

Although this program requires an understanding of security systems and firewalls, it offers a simple way to increase security for advanced users. The file size is small at 60MBand is appropriate for all platforms. The last version of the software was released in the year 2019.

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2. Shorewall


Shorewall allows for packet filtering and router/firewall/and gateway applications. Additionally, it allows you to utilize multiple ISPs simultaneously, based on the provider you use to provide the internet service. If you want to utilize the services of a VPN and connect to a VPN, that can be a possibility. Shorewall works with all VPNs.

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3. IPFire


IPFire is an excellent option for people who require a variety of functions from one program. For example, the program can be used as a firewall or VPN gateway and a proxy server. Another helpful feature is the ability to filter content.

Content filtering is excellent for personal computers at home with children and work computers. IPFire also uses hypervisors that allow users to play around with virtual machines.

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4. Vuurmuur


Vuurmuur is a new firewall that is compatible with IPV6. It comes with advanced monitoring capabilities for those who require these. It is also able to track bandwidth usage and connections in real time. This is beneficial for administrators of systems.

This firewall is easily set up to work with NAT (Network Address Translation), an excellent administrator option. It is unnecessary to have any prior knowledge of Iptables to utilize Vuurmuur effectively.

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5. ConfigServer Security Firewall (CSF)

ConfigServer Security Firewall (CSF)

ConfigServer is compatible with virtually every virtual machine. One of the most valuable features is email setting up and receiving alerts concerning possible security threats.

These alerts will notify users using the most resources or activities that could be considered suspicious. The program could also be utilized to identify ways your system could be hacked and safeguard it appropriately.

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6. IPtables


The most widely used command-line-based firewall is Iptables/Netfilter. It is the first-line defense for Linux server security. Many system administrators use it to fine-tune their servers. In addition, it filters packets within the kernel’s network stack. Here is a more comprehensive overview of Iptables.

Iptables is a well-known name in the firewall domain. It’s a firewalling program that allows you to define rulesets. It is terminal-based and used by experienced Linux server admins because it is customizable and effective.

However, it can be challenging to set up new system administrators. The system kernel performs data packet filtering tasks. These are the attributes and features of the iptables firewall:

  • It supports content listing with packet filter rulesets.
  • It uses a packet inspection approach to make the firewall convenient and fast.
  • Users can add, edit or remove a firewall configuration using editable packet rulesets.
  • It can back up data files and restore functionality tied to the firewall.

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7. UFW – Uncomplicated Firewall

UFW – Uncomplicated Firewall

UFW is Ubuntu’s default firewall tool. It is designed to reduce complexity and make it easier for users. GUFW, a Graphical User Interface of ufw, is also available for Ubuntu users.

This firewall security software aims to simplify the iptables firewall by using Gufw. GUI – Gufw is highly user-friendly, simple to use, and easy to integrate with other applications.

  • Supports IPV6
  • Status monitoring
  • It’s extensible and can be easily integrated with other applications
  • You can add, remove, or modify firewall rules to your preference
  • Has an On/Off facility as an extension of its logging options

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8. Smoothwall Express

Smoothwall Express

Smoothwall’s open-source firewall offers 7 layers of control. Smoothwall’s firewall and Smoothwall filter offer companies complete online protection. You can also access the firewall by itself for bandwidth management, anti-malware protection, and dynamic threat filter.

Smoothwall firewall, primarily focused on the UK education system, is one of the most innovative tools available. Thousands of forum members contribute to Linux- and GNU-based solutions every day. To reduce firewall vulnerabilities, the OS has been security-hardened. In addition, UK support is available for those who need extra assistance.

A new system administrator may find it difficult to ensure network security. A Linux firewall is a good choice for a novice. It’s easy to use and has a compact interface. Smoothwall Express is the best choice for you.

Smoothwall Express is a free, open-source firewall solution. It also includes a solid security function for Linux servers. Smoothwall Express supports both internal and external network firewall filtering. It includes insight traffic stats, a web proxy to accelerate, and LAN and DMZ.

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9. Perimeter 81

Firewall as a Service (FWaaS) from Perimeter 81 is user-friendly and offers safe, off-premises access to business cloud-based services.

Further, it enables administrators to restrict access to certain network resources based on the identities of individual users or groups. This allows managers of an organization to restrict access to a certain resource to only those who need it.Perimeter 81

Unlike conventional firewalls, FWaaS from Perimeter 81 may be set up in the cloud immediately. FWaaS’s user segmentation and fine-grained permission-based controls are powerful tools for keeping corporate data and mobile employees safe. Further, it works with any electronic gadget (Windows, Mac, iOS, Android, and Linux servers).

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10. PfSense

pfSense is an open-source firewall similar to Untangle, without a few extras like web filtering and antivirus. On the other hand, the package manager makes it possible to install more than three dozen more plugins from the outside.PfSense

You can deploy pfSense on your own hardware or in a virtual machine by using the CD image (.iso), USB image (.usb), or Embedded image (.img) of the software. pfSense is based on FreeBSD with a modified kernel. In addition, you can purchase hardware with pfSense already installed on it.

The $99 annual membership fee is for access to all the services and support they provide. You can get a digital book on pfSense, a video library with the most relevant films from the developers, and even automatic backups if you pay for support and services.

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Before installing any free firewalls, be sure they will meet your requirements. Specific software is installed locally, while other software is installed separately that serves as routers or firewalls across the whole network.