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Adding IOS Images in GNS3

This post describes the step-by-step process to configure GN3 IOS images on a Windows machine.

It is assumed that you have the latest GNS3 software and a couple of IOS images for Cisco routers.

A list of IOS images and the amount of needed RAM is given in the table below. Note that these RAM values are the minimum values that worked with my GNS3 installation.

IOS image Platform Model Default RAM
C1700-K9.BIN c1700 1710 64MiB
C2600-AD.BIN c2600 2621 64MiB
C3600-JK.BIN c3600 3660 128MiB
C3700-AD.BIN c3725 3725 128MiB
C7200-AD.BIN c7200 7200 256MiB


Add an IOS Image to GNS3

In the following steps, we will add a Cisco 7200 IOS image to GNS3 and configure it.

  • In the GNS3 menu bar, go to Edit
  • Under the Edit menu, click on IOS Images and Hypervisorsadding-ios-images-to-gns3-1
  • In Preferences, under Dynamips–> IOS routers, click on new:adding-ios-images-to-gns3-2


  • Browse to the folder which contains the desired IOS image. Select the desired IOS image and click the Open button (pardon my French keyboard)adding-ios-images-to-gns3-4
  • Click Yes to copy the IOS image to the default images directory:
  • After you hit the save button, click Next. Then you’ll be taken to the menu for defining the name and the plateform of the IOSadding-ios-images-to-gns3-6
  • Choose adequate amount of RAM for the router:

adding-IOS-images-to-GNS3-2015-11-08 19_06_58

  • Continue with the steps until you finish creating an image.

Repeat the same steps for every IOS image you want to have in GNS3.

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