Cisco Packet Tracer
Networking
Network simulation for learning networking.
Free
Available for Windows, macOS, Linux
GNS3
Build virtual network labs.
Official source: gns3.comLast verified: awaiting review · How we check softwareDeveloper: GNS3 Technologies
What is GNS3?
GNS3 emulates real network devices in virtual labs, for more advanced networking practice. Some device images need their own licences.
Key features
- Emulates real router and switch images
- Drag-and-drop topology builder
- Capture lab traffic in Wireshark
Supported platforms
Pricing & licence
Open Source Open Source
Open source: the source code is public, so anyone can inspect it, and it's free to use.
Prices change, so check gns3.com for current pricing.
Pros & cons
Pros
- Close to real device behaviour
- Free and open source
Cons
- Needs device images and plenty of memory
Installation
Package names were checked against each official package registry, and commands install the same software as the official download. Only run commands you understand.
Alternatives to GNS3
No alternatives listed yet.
Related software
GNS3 FAQ
Is GNS3 free?
Yes. GNS3 is free and open source.
Do I need Cisco images to use GNS3?
GNS3 does not include vendor device images. You supply images you are licensed to use, for example through your employer, university or vendor programme, or use the free appliances available for it.
Do I need the GNS3 VM?
On Windows and macOS, the GNS3 VM is recommended because many device types need a Linux environment to run. On Linux, GNS3 can usually run them directly.
Which platforms does GNS3 support?
GNS3 is available for Windows, macOS and Linux. It isn't available for Android and iPhone & iPad.
Can I install GNS3 with Homebrew?
Yes. Run "brew install --cask gns3" in Terminal.
Where can I download GNS3 safely?
From the official website, gns3.com. Aptorise links only to official sources and never hosts installers.