Top 10 Linux Firewalls in 2025

Today, many computers are connected to various networks, creating a strong need for software tools — firewalls — that monitor all network traffic and filter out harmful data while allowing legitimate information to pass through.

Early firewalls only performed basic filtering based on the sender’s IP address, port number, or domain name. However, modern firewalls can analyze transmitted data and provide more advanced filtering capabilities.

Hackers now use cutting-edge technologies to carry out various attacks. Therefore, installing robust firewalls on Linux servers is crucial for protecting against DDOS and DOS attacks. Firewalls help filter out malicious data packets, significantly reducing the load on servers and systems.

In addition, modern firewalls, enhanced by artificial intelligence, can analyze data and improve filtering quality over time.

Hackers often attempt to bypass firewalls. Interestingly, even they may need firewalls to protect their systems. The key difference is that malicious hackers use firewalls for their gain, while ethical hackers utilize them to safeguard their organizations from harmful requests.

Ultimately, whether for personal or organizational use, firewalls are essential tools for ensuring security.

Key elements in network security include routers, switches, bridges, and others. Among these, one of the most powerful systems is the Intrusion Prevention System (IPS). IPS monitors malicious activities through firewalls and automatically works to mitigate emerging threats.

Top 10 Linux Firewalls in 2025

Here is a list of the 10 best Linux firewalls recommended for 2025:

1. OPNsense

  • User-friendly web interface.
  • Intrusion Detection & Prevention (IDP) system.
  • Two-factor authentication.
  • Free, open-source software.

2. Shorewall

  • Flexible management.
  • Zone-based network configuration.
  • Free, open-source software.

3. Iptables

  • Powerful packet filtering tool based on the Linux kernel.
  • Free and integrated into Linux systems.

4. pfSense

  • Comprehensive configuration and traffic shaping capabilities.
  • Managed via a web interface.
  • Free, open-source software.

5. Endian Firewall

  • Integrated with antivirus and VPN features.
  • Community edition available for free.

6. Smoothwall Express

  • Simple and intuitive user interface.
  • Free, open-source software.

7. Vuurmuur

  • Managed using an Ncurses GUI.
  • No need for IP Table knowledge.
  • Free, open-source software.

8. IPCop Firewall

  • Easy installation and setup.
  • Content filtering and advanced network security.
  • Free, open-source software.

9. ClearOS

  • Network security and easy management.
  • Free software with additional features available via subscription.

10. OpenWRT

  • Software designed for routers.
  • IPv6 transition support.
  • Free, open-source software.

Each of these firewalls has unique features tailored to different needs. If you’re looking for a robust corporate-level security system, OPNsense or pfSense is highly recommended. For small businesses or home offices, Smoothwall Express may be the ideal choice.

By using firewalls, you can safely manage large volumes of incoming data and prevent malicious attacks. Be sure to consider the specific features of each system and choose the one that best meets your needs.

Skip to content