A graphical network simulator to design and configure virtual networks

GNS3

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GNS3

  -  105 MB  -  Open Source
Free Download

Security Status

GNS3 is a software that simulate complex networks while being as close as possible from the way real networks perform, all of this without having dedicated network hardware such as routers and switches. It can also be used to experiment features or to check configurations that need to be deployed later on real devices.

Build, Design, and Test your network in a risk-free virtual environment and access the largest networking community to help. Whether you are studying for your first networking exam or building out a state-wide telecommunications network, GNS3 offers an easy way to design and build networks of any size without the need for hardware. And the best part is it's free!



Why should you use GNS3?

Real-time network simulation for pre-deployment testing without the need for network hardware
Run the OS that emulates the real behavior of network hardware.

Test 20+ different network vendors in a risk-free virtual environment
Quickly run and test multiple hardware vendors without the need for hardware.

Create dynamic network maps for troubleshooting and proof of concept (POC) testing
Test your networks before you build them to reduce the time it takes to get a production network up and running.

Connect GNS3 to any real network
Leverage your existing hardware and expand your current lab by connecting you're the app topologies directly to it.

Customized topologies and labs within GNS3 for network certification training
This app is the best study tool for aspiring network professionals seeking their certifications, without the need for a home lab.

Note: Requires Wireshark.

Also Available: Download GNS3 for Mac

Download GNS3 Latest Version

  • GNS3 2.2.51 Screenshots

    The images below have been resized. Click on them to view the screenshots in full size.

    GNS3 2.2.51 Screenshot 1
  • GNS3 2.2.51 Screenshot 2
  • GNS3 2.2.51 Screenshot 3
  • GNS3 2.2.51 Screenshot 4

What's new in this version:

Gui:
- Python 3.13 support
- Upgrade dependencies
- Add keyboard shortcut for Add Link

Server:
- Catch error when cannot resize Docker container TTY
- Do not use "ide" if there is a disk image and no interface type has been explicitly configured
- Use locking when sending uBridge commands
- Fix run Docker containers with user namespaces enabled
- Python 3.13 support
- Upgrade dependencies
- Fix errors in init.sh

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