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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.

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License

GNU General Public License version 3.0 (GPLv3)

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4.8 out of 5 stars

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joseph-marketer Posted 2026-01-12

I’ve been using GNS3 to build and test network topologies, and it’s been a game changer for hands-on learning and lab work. Whether I’m practicing routing protocols, experimenting with firewall setups, or replicating real-world network scenarios, GNS3 gives me a sandbox that behaves very similarly to physical gear. The depth of support for different vendors and devices is impressive, and being able to visualize and interact with packet flows adds a level of realism that generic simulators can’t match. It’s especially valuable if you’re prepping for networking certifications or testing network designs before deploying them live. However, it’s not plug-and-play. Getting GNS3 installed with all dependencies (like IOU/IOS images and proper virtualization) can take some dedication — and you’ll need decent hardware to avoid slowdowns once you start connecting many devices. Beginners without networking background may feel overwhelmed at first. Overall, GNS3 is a powerful tool that delivers real value to network engineers and students, but it demands patience and some technical skill — hence a 4-star rating.
darek1983 Posted 2020-01-24

There is still some room for improvement but it already is a quality. Fantastic tool for network engineers.
corix465 Posted 2019-10-29

Hi Guys and to ALL those in making GNS3 great, A very nice tool this gns3 is, kudos all round. I have a few feature requests that should be easy to implement: 1 - Please add a 'Close Project' button as well as a menu item under the 'File' menu. REASON: in general closing something like a file or project makes more sense to the everyday user as we were taught this from the 1990's already... 2 - When a topology is made by dragging items to the screen, do not bind the gns3 version (2.1.21 or 2.2 etc. ) to the topology. Instead have a compatible window to state the version number compatibility. REASON: We share topologies between friends/programmers/consultants and not ALL of us prefer to use the latest greatest versions. It will be best to make the topology stand-alone item that can be exported/imported with ease across different versions of GNS3 3 - Please add a feature to the 'Snapshots' window to: --edit the name of the snapshot -- 'Lock' & 'Unlock' the snapshot to prevent ANY changes to it -- 'Autoload' a snapshot upon project opening -- 'Update' a snapshots' items in the window after a config change was done so the user can open the 'Snapshots' window, select the relevant snapshot and click 'Update' . The 'Delete' and 'Restore' features works just great. Thanks Guys, hear from you soon JM
peteybaldbloke Posted 2019-07-23

A superb tool for network engineers. Invaluable for study and proof of concept work. And it's free & open source. What more could you ask for?
cwicz Posted 2018-07-18

just brilliant

Additional Project Details

Awards

Apr 2015

Operating Systems

BSD, Linux, Mac, Windows

Intended Audience

Advanced End Users, Education, Engineering, System Administrators, Telecommunications Industry

User Interface

Electron, Qt

Programming Language

C, Python

Related Categories

Python Emulators, Python Networking Software, Python Simulation Software, Python Network Simulators, C Emulators, C Networking Software, C Simulation Software, C Network Simulators

Registered

2007-06-08

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