You may run simulations or configure devices ranging from simple workstations to powerful Cisco routers.
GNS3 is a graphical network simulator that allows you to design complex network topologies. To get GNS3 version 1.2 working on Kali Linux follow this tutorial, i tested it on My kali Linux 1.0.9 64-bit and it works fine.
The provided script doesn’t work for Kali Linux because of tons of unmet dependencies. On our previous tutorial on GNS3 we talked about how to install GNS3 1.2 on Ubuntu with a script. Happy new year guys!!!, This is 2015 and without GNS3 1.2.1 running on Kali Linux i don’t think it will go well. Home GNS3 How to Install GNS3 Version 1.2.1 on Kali Linux and Debian (Last Updated On: June 27, 2016)