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The Book of GNS3 by Jason C. Neumann

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Chapter 3. Configuration

Installing GNS3 is only the first step on the road to creating projects; the second step is configuration. Fortunately, GNS3 has never been easier to configure, and you need to perform only a few tasks. In this chapter, I’ll cover the basic GNS3 configuration options you need to get IOS routers up and running using Dynamips.

Acquiring an IOS Image

The virtual Dynamips routers provided by GNS3 are emulated hardware devices. Like a freshly formatted PC hard drive, your virtual routers are patiently waiting for you to install an operating system so they can do something useful. What they need is Cisco IOS!

Before you can boot up a router, you’ll need to install and configure at least one Cisco IOS image file in GNS3, though ...

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