Sophos Free Linux Installer

Download the standalone installer. Log in to your Licensing Portal using your Sophos ID. Click Endpoint / Server Protection. If you haven’t yet provided the Product License username and password, click Add your product credentials, otherwise click Download the software. Click Standalone Installers and select either: Endpoint and Server for Linux.

This article has been last updated on August 3, 2020.

There are countless Free an Open Source Linux/BSD distributions to choose from for your router. However, there are many outdated recommendations on the internet, so it's not an easy choice. For that reason, we have decided to create a definitive firewall comparison for 2020.

Wikipedia has a list of router and firewall distributions, but the list is not useful, because it's inaccurate (as of August 2020) and it doesn't really compare these systems in any useful way. It also lists many outdated and irrelevant systems that should be avoided in 2020.

If you are looking to get the most of your hardware appliance, or are building a new firewall, we have done the research for you.

Why is our router distro comparison better than others?

For many years we have been selling hardware for building Open Source firewalls and routers. Over the last year, we have installed and configured most, if not all the distributions out there. We install and configure pfSense, OPNSense, OpenWRT, ClearOS, IPFire, and other OSes every day, so we have a good idea which Operating systems work better than others. We don't make any money from any software vendors, which make this recommendation relatively objective.
We hear customer feedback daily, if there are performance issues or problems with updates, we hear about it.

Top 10 Open Source Firewall Software to avoid - what you should NOT use.

Other comparisons out there are recommending Operating Systems that are long dead or no longer relevant. This is most likely because these 'Top 10 Open Source Linux Firewall Software' lists are copied from year to year by non-technical users, without doing the actual comparison.

Some Operating Systems have been superseded or simply stopped being maintained and became irrelevant. You want to avoid such systems because of security reasons - these distros use outdated and have insecure Linux/BSD kernels which can potentially expose you to security exploits.

1. IPCop - avoid at all cost

Once popular operating system, included in all 'top 10' lists such as this one. You should avoid using it. The last release was in 2015, and the system is ancient by today's standards. The official website is dead, but the source code is still out there. Don't use it.

Sophos Free Linux Installer Download

2. Smoothwall - long dead


Smoothwall got some good reputation in the early days when it was competing with IPCop. It went silent in 2014. Smoothwall OS has been abandoned and is no longer relevant, or secure. You should avoid it. The website is still up and running, but hasn't been updated in many years.

3. DD-WRT - no longer competitive

This is a little controversial recommendation because I know that many users still feel that DD-WRT is good. It certainly was back in the day. Today DD-WRT is still functional and works, but it's not great or innovative. It's mostly unchanged since 2014 and fell far behind other open source competitors. Today there are many good alternatives, such as OpenWRT.

4. M0n0wall - retired

M0n0wall is the godfather of the most successful operating systems we have today. It's been one of the most innovative projects in its day, but it's now retired. System hasn't received any updates since early 2014 and is officially abandoned.
Manuel Kasper, the author of M0n0wall recommends OPNSense as its successor.

5. Tomato - not for new routers

Tomato is cool, and we love it, but it's a minimal firmware designed for flashing off-the-shelf routers such as D-Link and Asus. The system is still relevant if you want to resurrect your old hardware and make it functional again, but if you are building a new router you probably don't want to use tomato on it. We are building powerful routers from scratch, so we generally don't use this system (we still love it).

6. Zeroshell - poor choice

We like the concept of Zeroshell, and we hope it succeeds, but today the system is far behind it's competitors. The Web UI is very rudimentary, and the functionality is limited. We will keep an eye on it, and update this recommendation if things change. The website hasn't been updated since 2018, so at the moment this project doesn't look promising.

Not recommended because they are not user friendly

There are other systems that are relevant, and receive updates, but we still don't recommend them, at least to less technical users.

We don't recomment the below systems, because they require relatively high expertise to perform simple tasks. These days, SOHO routers (Small Office / Home Office) should be easy to setup and have Intuitive Web Interface to manage. For these reasons we don't recommend the following systems:

7. VyOS - no Web interface

We love VyOS, but we highly discourage our customers from getting it, unless they really know what they are doing. This system must be managed from command line, and it requires high level of expertise to maintain and use.

8. OpenBSD and FreeBSD - use only if you have 10+ years of the command line experience

OpenBSD and FreeBSD are actively developed and are very capable, but these systems require a high level of understanding of operating system internals, and low-level networking to be used as routers.

We routinely install both systems for customers that are experts, such as network administrators or software developers. If you don't want to mess with system internals and spend hours reading manuals, this is not a system for you. It does not provide any Web UI or GUI tools for configuration. It's a barebones terminal based system.

9. Debian and Ubuntu - don't use general purpose OS for your router

These systems are not intended for routers. They are general purpose operating systems, and should not really be used as routers. Similar to OpenBSD and VyOS, you will have to configure everything by hand without a Web Interface.

Nor recommended because they are not really free

There are also a few systems we don't recommend because they are not truly free or open source.

10. Untangle - is it really free if OS asks you to upgrade to a paid version?

Untangle NG Firewall is truly great software, with many happy users. We don't recommend it because the free version is very limited, and the operating system constantly incentivizes the users to upgrade to a paid subscription to unlock the cool functionality. The cheapest license is $50 USD/year.

11. Sophos - small fish in an enterprise pond

Sophos 'XG Firewall' distribution has a very nice user interface and is free for home use. We generally don't recommend it because it's not a system that Sophos itself promotes. Sophos' website seems to make it purposefully hard to find, and the community is very small. Sophos, in general, is an enterprise software company, with one community product. There's no Open Source spirit here.

12. Endian - you really have to pay to use it fully

Endian is actually pretty cool, and free. We don't recommend it because features like WiFi are available only in paid subscriptions. Similar to Untangle, it's good software, but you have to pay for it - this disqualifies it from our consideration.

To choose the best Operating System for routers we have set a few basic guidelines. All systems not compatible with these guidelines have been rejected.

Basic requirements for choosing Firewall Operating System

  1. The system must be actively maintained, and regularly receive security patches.
  2. The system must be fully Free and Open Source
  3. The system must have a Web interface or GUI. Command line operating systems are disqualified.
  4. The system must be performant, and work well for a typical user.

These basic requirements are reducing the list of recommendations to 4 systems. pfSense, OpenWRT, OPNSense and IPFire.