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GNS3 is a graphical network simulator that allows simulation of complex networks.

To allow complete simulations, GNS3 is strongly linked with:

  • Dynamips, the core program that allows Cisco IOS emulation.
  • Dynagen, a text-based front-end for Dynamips.
  • Qemu, a generic and open source machine emulator and virtualizer.
  • GNS3 is an excellent complementary tool to real labs for network engineers, administrators and people wanting to pass certifications such as CCNA, CCNP, CCIP, CCIE, JNCIA, JNCIS, JNCIE.
It can also be used to experiment features of Cisco IOS, Juniper JunOS or to check configurations that need more...

What's New

Version 3 0.8.3:

New features:

  • Option to freely use the first VBox interface inside VMs (i.e. eth0 on Linux).
  • New base configuration (startup-config) for devices with NM-16ESW (named baseconfig_sw.txt).
  • Console and headless mode support for VirtualBox devices.
  • Embedded console/terminal server to access VirtualBox VM consoles using Telnet.
  • Support for drag & drop of more...


OS X 10.7 or later

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Current Version (3 0.x)


Downloads 3,663
Version Downloads 3,036
License Free
Date 13 Jul 2012
Platform Intel 64 / OS X / Intel 32
Price Free
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