: For optimal performance and multi-vendor support, it is highly recommended to also download the GNS3 Virtual Machine (VM) . This can be run in free hypervisors like VMware Workstation Player or Oracle VirtualBox . System Requirements for 2026
GNS3 (Graphical Network Simulator-3) is the gold standard for network professionals and students who need to build, design, and test complex network topologies without investing thousands in physical hardware. Unlike simple simulators that mimic network behavior, GNS3 is a powerful emulator that runs real network operating systems, providing an authentic environment for everything from CCNA prep to high-level pre-deployment testing. gns3 free download
: Select the "All-in-One" package for Windows , macOS , or Linux . : For optimal performance and multi-vendor support, it
GNS3 is open-source software released under the GNU General Public License, making it free to download and use. : Go to the GNS3 Download Page . Unlike simple simulators that mimic network behavior, GNS3
Because GNS3 emulates actual hardware, it is resource-intensive. To run large, multi-vendor topologies smoothly, your system should meet these updated specifications: Getting Started with GNS3