This procedure describes how to install GNS3 and its supporting software on a Linux host computer running Xubuntu 13.10. In this post, we show how to install and set up GNS3 and VirtualBox to emulate a network consisting only of open-source routers and hosts. While there are many web sites and online tutorials dedicated to using GNS3 to emulate Cisco networks and Juniper networks, I found only a small amount of information about using GNS3 to emulate a network of Linux virtual machines running open-source routing and switching software. Our interest is to emulate networks of open-source routers and switches using open-source technologies. GNS3 also supports other hardware emulation and virtualization technologies that can run Linux virtual machines: Qemu and VirtualBox. GNS3 supports Cisco router software images running on the Dynamips hardware emulation program. GNS3 is primarily used to emulate networks of Cisco routers and is used by professionals studying for Cisco certification exams. GNS3 is a very popular network simulation tool that runs on the major operating systems: Windows, Mac OS, and Linux.
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