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GNS3  does not come with any Cisco IOS(router)/IOU(switch) firmware due to legal/licensing issues.

I will not cover how to get a hold of Cisco IOS. LMGTFY. (Your welcome :-P)

Once you have a copy of the IOS, fire up GNS3 and head to

Edit>>Preferences (This is were ALL the settings are)


 Then under DynamIPS>> click IOS Routers >> New


Browse to IOS image and click next a few times, accepting defaults. Once at the Idle-PC screen if you see this, hit "Idle-PC Finder"


Then it should find a number >>


Congratulations, that's it, Your new Router IOS should show up in GNS3!

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