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monowall aims to create a complete, embedded firewall software package that, when used together with an embedded PC, provides all the important features of commercial firewall boxes, and is really easy to use.

monowall is based on a bare-bones version of FreeBSD, along with a web server, PHP and a few other utilities.

If you don’t want to build your own firewall but you want to have a full-featured firewall appliance, then monowall is a great solution.

This image has the network interfaces already assigned and configured for the different platforms, unlike the standard monowall image.

This allows you to plug it in and go without having to connect to the console.

For full details of the configuration, please check the readme file (see below).

For the official monowall release, please go to

Pre-built images of monowall

ALIX 2-2
Version: 1.8.1
Platform: ALIX 2-2
Date: 11 Aug 2014
Image size: 10 MB
Media: CF card
ALIX 2-3
Version: 1.8.1
Platform: ALIX 2-3
Date: 11 Aug 2014
Image size: 10 MB
Media: CF card
Version: 1.8.1
Platform: net5501
Date: 11 Aug 2014
Image size: 10 MB
Media: CF card

Devices supported by these monowall images


Get it installed for you

We’ll install your software of choice for free when you buy one of our standalone servers or a rack mount server (including a Compact Flash or SD card).

You can also add one to any CF or SD card purchase for only $10.

Just select the operating system you want from the product options, and your order will arrive with the image pre-installed on the CF card, so you can just plug it in and go.

Do it yourself

You can write these images to a Compact Flash or SD card yourself, using dd (BSD/Linux) or Physdiskwrite (Windows).

If you don’t have them already, you’ll need a CF or SD card and a CF/SD card reader (or a CF to IDE adapter).

Note: All of the above images were created and tested on SanDisk cards, unless otherwise specified.

A note on image sizes

For best results, use the same CF card size

These images have been built on particular size Compact Flash cards.

Flashing an image onto a CF card of the same size will generally give you the best results, making the most of the available space and ensuring that the image will boot.

If you use a CF card that is smaller than the image, it will most likely refuse to boot.

If you use a CF card that is larger than the image size, you will end up with inaccessible space (unless you know how to repartition the card).

There’s no harm in using a larger CF card if that’s all you can get your hands on. You just might have some wasted space.

m0nowall can’t use extra space

monowall doesn’t allow you to save files to the CF card, so there’s no point using a bigger card than you need to fit the image (unless you plan to configure the card for multiboot operation).

Although the images will fit onto any CF card bigger than the image size, the rest of the space on the CF card will be inaccessible to the monowall and Rident™ operating systems.

So there’s no harm in using a bigger card, just some wasted space.

You might also want to check out this table that explains which compact flash card sizes to use for each image.

If in doubt, please ask us.

Other software

There are lots of great open-source operating systems that you can use on the APU, ALIX, net5501, net6501 and fitPC’s.

We’ve listed a selection of this amazingly useful software to give you even more options.

We’re not the experts

We supply these files purely for your convenience and can’t make any promises about their suitability for your project.

We can’t provide technical support for these images, because we’re not experts in these operating systems, and don’t want to pretend that we are.

If you’re unsure, please get technical advice from a suitably qualified expert before proceeding.

Note: These images are not endorsed by the creators and maintainers of m0n0wall.