GNS 3 - Graphical network simulator

If you need to test router configuration, prepare small lab or just learn something then download and use GNS 3. Just remember that you need your own OS images, it's a good thing if you want to get your hands on commands available for older IOS versions (IGRP for example).

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About Milosz Galazka

Milosz is a Linux Foundation Certified Engineer working for a successful Polish company as a system administrator and a long time supporter of Free Software Foundation and Debian operating system.