A graphical network simulator to design and configure virtual networks

GNS3 for Mac
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GNS3 for Mac

  -  130 MB  -  Open Source
Free Download

Security Status

GNS3 for Mac 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 for macOS 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 real behavior of network hardware.

Test 20+ different network vendors in 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 your GNS3 topologies directly to it.

Customized topologies and labs within GNS3 for network certification training
GNS 3 is the best study tool for aspiring network professional seeking their certifications, without the need for a home lab.

How to Use
  • Install GNS3 and required dependencies
  • Launch GNS3 and complete the setup wizard
  • Configure GNS3 VM or local server settings
  • Import Cisco or other compatible images
  • Create a new project in GNS3
  • Drag and drop devices into the workspace
  • Connect devices using virtual links
  • Start the devices and open console windows
  • Test network configurations and topologies
  • Save and export your project for later use
System Requirements

macOS 10.15 (Catalina) or later

Intel-based or Apple Silicon Mac

4 GB RAM minimum (8+ GB recommended)

2 GHz dual-core CPU or better

Virtualization software (VMware Fusion or UTM)

1 GB free disk space (more for images/projects)

Python 3.x pre-installed or install via Homebrew

PROS
  • Highly customizable network topologies
  • Supports real Cisco images and appliances
  • Free and open-source platform
  • Extensive community and documentation
  • Offline simulation without cloud use
CONS
  • Requires complex image setup
  • Heavy resource usage on large labs
  • Not optimized for Apple Silicon yet
  • Limited official support for macOS
Note: Requires 64-bit processor.

Also Available: Download GNS3 for Windows

Download GNS3 for Mac Latest Version
Why is this app published on FileHorse? (More info)

  • GNS3 3.0.5 Screenshots

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

    GNS3 3.0.5 Screenshot 1
  • GNS3 3.0.5 Screenshot 2
  • GNS3 3.0.5 Screenshot 3
  • GNS3 3.0.5 Screenshot 4

What's new in this version:

GUI:
- Replace "Docker hub" by "Docker repository" because it is possible to use different repositories
- Upgrade dependencies
- Fix bring console in front when clicking on "Open all consoles"
- Add -F arg to wmctrl

Server:
- Bundle web-ui v3.0.5
- Sync appliances
- Use Ubuntu 24.04 LTS in Dockerfile
- Fix tests and require Qemu version >= 2.4
- Fix adding pci_bridges to qemu vms
- Resolve deprecation warnings of regex library
- Remove OVMF_CODE_4M.secboot.fd and associated code
- Add edk2-stable202502 UEFI firmwares and try to first use firmwares from the ovmf package if installed
- Prettify TPM error message
- Fix bug in qemu_stdout message
- Try to detect swtpm and AppArmor issue
- Fix Docker logs decoding
- Add delay after starting a Docker container and adding connections in uBridge
- Fix TypeError when reading Docker container logs
- Allow an image to be uploaded to the controller again even if it is already in the database
- Fix controller not reporting an error if invalid options are passed to Qemu command line
- Replace "Docker hub" by "Docker repository" because it is possible to use different repositories
- Fix unable to add NAT cloud after configuring “allowed_interfaces” in configuration file
- Fix interface information API endpoint for Cloud/NAT devices
- Upgrade Jinja2 to v3.1.6
- Fix packet capture for links connected to a cloud node
- fix: check if remote-install.sh is being run as root

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