LSE toolsLSE toolsDouane (105)Douane (105)

Tool and Usage

Project details

Programming languages
C, C++, GTK+
Guillaume Hain
Latest release
No release found
Latest release date

Project health

This score is calculated by different factors, like project age, last release date, etc.

Why this tool?

Douane is an application firewall that blocks unknown or unwanted traffic. It provides a more fine-grained filtering as it looks at the combination of application and used network ports. This is useful when allowing common browse traffic on port 80 and 443. Instead of all applications being able to use this port, only the ones that are granted access will be able to do so. When a new connection is not trusted yet, Douane will ask to allow or deny the traffic stream.

How it works

Douane will be active in the background and be listening for new connections. This is done using a custom kernel module and using the netfilter capabilities in the Linux kernel.

Usage and audience

Douane is commonly used for network traffic filtering. Target users for this tool are general public and system administrators.


  • Graphical user interface

Tool review and remarks

The review and analysis of this project resulted in the following remarks for this security tool:


  • + The source code of this software is available

Author and Maintainers

Douane is under development by Guillaume Hain.


Supported operating systems

Douane is known to work on Linux.


Several dependencies are required to use Douane.

  • GTK 3
  • Linux 3.x kernel
  • Python 3

Douane alternatives

Similar tools to Douane:



The iptables tool is the userspace command line program part of the netfilter project. Since Linux 2.4 it is the standard packet filtering engine. Among standard traffic filtering, it can be used for Network Address Translation (NAT).



OpenSnitch is a Linux port of the popular macOS Little Snitch application firewall



nftables is a subsystem of the Linux kernel to filter and classify network traffic and supposed to replace netfilter.

All Douane alternatives

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This tool is categorized as a Linux firewall and application firewall.