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The 9 Best Free Linux Firewall

Firewalls are one of the most useful ways of adding extra bit of security to the system. Well-configured firewalls will make it pretty tough to break into the system. There are Linux firewalls that can also protect one’s system from mis-configurations or mistakes elsewhere in their system but they cannot be regarded as a sole or primary defense against hacking. Frequent and regular patching as well as updates to firewall is still important. Department and campuses are currently having the minimal firewall that is enabled at network level. Coming to personal machines, personal firewalls are available but they aren’t pretty effective. Users can make use of Linux firewall as it offers increased security.

1. Endian UTM Appliances

Endian is purely an Open Source solution that promotes working and development with open source community for building secure, complete, as well as stable firewall. Endian Firewall Community can be called as the turn-key linux security distribution having the ability of turning each system into a fully featured security appliance in addition to UTM (unified threat management) functionality. Furthermore these Linux firewalls are simple to manage, use, and install without compromising its flexibility. Features included in this packet inspection firewall include antivirus support, spam-filtering especially for the email traffic (SMTP and POP), hassle-free VPN solution, web traffic content filtering, and application-level proxies mainly for different protocols like SMTP, POP3, FTP, and HTTP).

Free Linux Firewall

2. IPcop

Ipcop is an excellent Linux firewall that has been designed keeping in mind the different requirements of a user. It offers stable, secure, and open-source Linux firewall distribution. It can be configured easily and its maintenance doesn’t require much hardwork or investment. This tool comes with reliable support for the Linux user base. An enjoyable environment is provided for individuals to discuss as well as request assistance. It comes with secure, easy-to-implement, and stable patches/upgrades for the Linux. It allows users to develop appreciation for not only Opensource movements but also for Linux in the user base. This software develops long-lasting relationship with the user-base.

Free Linux Firewall

3. Shorewall

Shorewall is actually a firewall/gateway configuration tool that can be used for Linux as well as for GNU. This tool comes with connection tracking facilities offered by Netfilter for the stateful packet filtering. Users can use this Linux firewalls in a number of firewall, gateway applications, and router. It is completely customizable and customization can be performed by making use of its configuration files. There is no limit to the count of network interfaces that can be used. It allows for network partitioning into different zones thereby offering complete control on the connections that are permitted between every zone pair. Users will be provided with multiple zones for every interface and multiple interfaces for every zone.

Free Linux Firewall

4. Uncomplicated Firewall

Uncomplicated Linux firewalls offer packet filtering system that is known as netfilter. It also comes with traditional interface that is used for manipulating netfilter. This is complete firewall solution offering increased flexibility as well as high configuration feature. To become proficient especially in iptables will take time and starting netfilter firewall by using just iptables will be a highly daunting task. The result is that several frontends for the iptables have been designed since past years and each one tried achieving different outcomes as well as targeted different audience as well. This tool acts as front-end mainly for the iptables and is well-suited for firewalls that are host-based. It offers framework so as to manage netfilter in addition to managing command-line interface to manipulate firewall.

Free Linux Firewall

5. OpenBSD PF

This is packet filtering tool that is stateful BSD licensed packet filter and acts as central piece for software to perform functions of firewall. This tool can be compared to ipfw, ipfilter, and iptables. This tool has been developed on the Open BSD but it can easily be ported to other OS like NetBSD, FreeBSD, Mac OS, and many more. These Linux firewalls come integrated with Quality of service and Network address translation. Quality of service is done by importing ALTQ tool as well as linking this tool with packet filtering configuration. CARP and pfsync are features for redundancy and failover, authpf to provide session authentication, as well as ftp-proxy for easing firewalling.

6. ClearOS Firewall

ClearOS Firewall is network, cloud-connected server as well as gateway OS that is specifically designed for hobbyists, Linux developers, and homes. This tool comes with Marketplace that is simple to install applications as well as solutions in snap and the credit for this goes to intuitive web-based user interface supported by this tool. This community edition has been designed for testing and application development from the Linux experts and community users. ClearOS Firewall is used by schools, professional organizations, and by not-for-profit organizations. Some of the excellent features supported by these Linux firewalls are antispam, content filtering, VPN, antivirus, and many more.

Free Linux Firewall

7. Smoothwall Firewall

Smoothwall offers content-filtering in real time. This web filter will analyze your content as well as context of the new material and that too in real-time so as to prevent all things from slipping through. This tool allows mobile devices to make use of filtered and secured internet as a result of which this tool is become an essential requirement in all organizations. With BYOD support, all devices connected to the WI-Fi of yours will be filtered as well as protected and some of these devices include Windows, Blackberry, Android, and iOS. With policy engine of smoothwall, users will get unprecedented flexibility and they can build policies depending on content, user groups, as well as on location and timeframe.

Best Linux Firewall

8. Zentyal firewall module

Zentyal makes use of Linux kernel subsystem that is known as Netfilter. Some of its functionalities are package marking, connection redirection capabilities, and filtering. This model is dependent on delivering maximum possible security using default configuration and at the same time trying minimizing efforts when new service is added. If users configure Zentyal as firewall, it will generally function between router and internal network connected to internet. For external interfaces, default policy will deny all new connections. For internal interfaces, these Linux firewalls deny connection attempts but exceptions are there for those connections that target services defined mainly by installed modules.

Best Linux Firewall

9. pfSense

This is a free tool that is open source and can be easily customized for usage as router and firewall. It is not only powerful but offers features of routing platform and flexible firewalling. Its packet filtering system allows for increased expandability without adding potential security and bloat vulnerabilities to base distribution. More than a million downloads of this tool have been reported and installations range from single computers to larger corporations, organizations, universities, and even to small homes requiring network protection. Currently, it is the most widely used firewall that offers embedded image especially for the compact flash dependent installations.

Best Linux Firewall

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