GNS3

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About

GNS3 is ranked #11 of 31 in network testing software on Inferse. It runs on Linux, macOS, Self-hosted, Web, Windows. There is a free plan.

Compared on network testing software

Free plan: Yesgns3.com
Simulation model: hybridgns3.com
Real-time emulation: Yesgns3.com
Hardware-in-the-loop: Yesgns3.com
Deployment options: desktopgns3.com
Automation API: Yesgns3.com

Facts

Purpose: GNS3 lets network engineers emulate, configure, test, and troubleshoot virtual and real networks.docs.gns3.com · 29 Sept 2026
Open source: GNS3 is open source software that users can download and use for free.docs.gns3.com · 29 Sept 2026
Architecture: GNS3 consists of a graphical all-in-one client and a virtual machine, with local or remote server options.docs.gns3.com · 29 Sept 2026
Multi-vendor support: GNS3 supports devices and appliances from multiple network vendors, including Cisco, Brocade, Cumulus Linux, and HPE.docs.gns3.com · 29 Sept 2026
Emulation and simulation: GNS3 supports both emulated devices running actual images and simulated devices such as its built-in layer 2 switch.docs.gns3.com · 29 Sept 2026
Integrations: GNS3 supports Docker instances, QEMU-based appliances, hypervisors including VMware, VirtualBox and Hyper-V, and connections to real networks.docs.gns3.com · 29 Sept 2026
Appliance marketplace: The GNS3 Marketplace provides preconfigured appliance templates that use recommended settings and are tested by GNS3.docs.gns3.com · 29 Sept 2026
Cisco image requirement: Users must provide their own Cisco IOS images; GNS3 says it cannot provide them.docs.gns3.com · 29 Sept 2026
Security: GNS3 documentation says a GNS3 server has no authentication enabled by default and should be restricted at the network level.docs.gns3.com · 29 Sept 2026
Who it is for: GNS3 is used for networking education and certification practice, proof of concepts, demonstrations, and interoperability testing.docs.gns3.com · 29 Sept 2026
Scale limit: GNS3 does not limit the number of supported devices by license; the practical limit is the host computer’s CPU and memory.docs.gns3.com · 29 Sept 2026
Support: GNS3 points users to its documentation and community for help, questions, and bug reports.docs.gns3.com · 29 Sept 2026
Platform requirements: The documentation lists Windows, macOS, and Linux, and recommends the GNS3 VM for most Windows and macOS setups and complex topologies.docs.gns3.com · 29 Sept 2026