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GNS3 is an application for simulating computer networks that supports a wide range of vendors such as Mikrotik, Cisco, Juniper, and more.

GNS3 is a GUI-based network simulator created in 2008. With this application, you can simulate devices using emulators or virtualization technologies. One of the first emulators used was Dynamips, designed to simulate Cisco IOS. Back then, in order to simulate a Cisco router, you had to install Dynamips separately for it to work on Windows, Linux, FreeBSD, or macOS. Today, GNS3 comes as a complete package with everything included, making it much easier to use.

GNS3 is an invaluable tool for network engineers, administrators, and students preparing for certifications such as Mikrotik (MTCNA, MTCRE, MTCWE, MTCTCE, MTCUME, MTCIPv6E, MTCSE, MTCINE), Cisco (CCNA, CCNP, CCIP, CCIE), and Juniper (JNCIA, JNCIS, JNCIE). It is widely used as a simulator for Cisco, Juniper, and Mikrotik routers, as well as for running virtual machines.

Unlike other network simulation tools such as Cisco Packet Tracer, which is limited to Cisco devices, GNS3 supports a variety of vendors and device types, including switches, routers, firewalls, servers, and even operating systems. In short, with GNS3 you can simulate almost any type of networking device in a single application.

This means you no longer need to build a physical lab with real devices, which can be both expensive and cumbersome. With GNS3, you can easily practice building both simple and complex topologies—all for free. As an open-source application, GNS3 is accessible to everyone.

GNS3 works using the concept of virtualization. In networking, virtualization allows users to create and run virtual hardware such as routers, switches, and firewalls on their physical computer. In GNS3, you can select from various virtual hardware options, including Cisco IOS, Juniper JunOS, or open-source software like VyOS.

Once virtual devices are chosen, users can build a network topology by logically connecting them with virtual cables. GNS3 provides an intuitive graphical interface for designing and configuring topologies. Users can add virtual hardware, connect devices, and configure settings such as IP addresses, routing, and security policies.

Many emulators exist for network simulation, but most don’t provide a complete set of commands for each simulated device. GNS3, however, uses the actual operating system of the device being emulated, meaning you interact with the real OS of the device in your simulation.

After building a network topology, GNS3 allows you to run the simulation by powering on the virtual devices. In simulation mode, you can test configurations, send data packets, and monitor interactions between devices. It also integrates with tools such as Wireshark, enabling users to capture and analyze network traffic within the simulation.

Over the years, GNS3 has become an essential tool for IT professionals to design, test, and understand networks. With its advanced features and strong community support, GNS3 plays a key role in helping users plan and implement reliable and secure networks in today’s evolving IT environments.

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WINDOWS INSTALLER [107.06MB]

MACOS INSTALLER [112.31MB]

LINUX INSTALLER