Download

Below you can download GNS3, a network simulator for making topologies of routers (IOS, JunOS), firewalls (ASA, PIX). It is particularly useful for training to Cisco certifications (CCNA, CCNP, CCIP, CCSP, CCVP or CCIE) or Juniper certifications (JNCIA, JNCIS or JNCIE).

Windows

• GNS3 v0.7.2 all-in-one (includes Dynamips, Qemu/Pemu, Putty and WinPCAP 4.1.1)
• GNS3 v0.7.2 binary

MacOS X

• GNS3 v0.7.2 DMG package (experimental and Intel x86-64 only, includes dynamips).

Sources

• GNS3 v0.7.2 zip
• GNS3 v0.7.2 tgz
• GNS3 v0.7.2 bz2

For an installation from the sources, GNS3 requires the following dependencies to be installed: Qt, Python, Sip, and PyQt. Please see the README for more information. Old releases can be downloaded on sourceforge

A GNS3 .deb package is officially released since Ubuntu 8.10. For experimental packages on Debian/Ubuntu, follow the instructions on http://gpl.code.de/oswiki/GplcodedeApt and install "gns3" package.

Associated softwares

• Dynamips 0.2.8-RC2 binary for Linux x86 platforms
• Dynamips 0.2.8-RC2 binary for Linux x86_64 platforms
• Dynamips 0.2.8-RC2 binary for Mac OS X (Intel)
• Dynamips 0.2.8-RC2 binaries for Windows XP and 2000
• Dynamips 0.2.8-RC2 source code

• Qemu 0.11.0 patched binaries for Windows
  
• Microcore Linux 2.10 Qemu image
  

• Pemu 2008-03-03 binary for Linux
  
• Pemu 2008-03-03 binary for Windows
• Pemu 2008-03-03 source code

• Cisco image unpacker 0.1 binary for Windows
• Cisco image unpacker 0.1 source code

• VPCS 0.15a

The official download page of Dynamips is there.