Once gns3 is installed, you can successfully make your topologies and run them, but before we start making topologies and simulations we need to configure the gns3. Select images(operating system) for routers, Routers are devices which need an operating system to carry out the operations we need them to. Every model of router requires a different operating system.
To configure gns3. Run gns3, then goto Edit->Preferences
Select IOS routers tab and press new
Select the image for a router you want to add. You can download router image for Router c3640 from here
Select the image and press next.
the router name will automatically be there when you press next from previous step. In case it's not there you can select from the dropdown lists and give it a name which you like to
Select the amount of ram you would allow your gns3 to reserve for this router. This router will be able to use 64 mb whenever I will start it in gns3 as I have allocated 64mb to it
the slots which it'll have by default every time we drag a router on gns3 workspace. I select 4 ethernet links on slot 0 and 3 fast ethernet links on slot 1,2 and 3
press the idle pc finder button to get the idle pc value. If you're lucky enough it'll end up placing an idle pc value in that text box. I wasn't lucky enough though :)
The image is added and now that router can be used
select a router by clicking the router icon on left and drag a router twice you just created in the workspace area. Then click the link icon on left bottom, click on a router select a slot, then click another router and select another slot . This will link both routers as shown below, Then press the start button and you will see the link red spots becoming green. We all good to go. A router added we can now start simulating with gns3
To configure gns3. Run gns3, then goto Edit->Preferences
Select the image and press next.
the router name will automatically be there when you press next from previous step. In case it's not there you can select from the dropdown lists and give it a name which you like to
Select the amount of ram you would allow your gns3 to reserve for this router. This router will be able to use 64 mb whenever I will start it in gns3 as I have allocated 64mb to it
the slots which it'll have by default every time we drag a router on gns3 workspace. I select 4 ethernet links on slot 0 and 3 fast ethernet links on slot 1,2 and 3
press the idle pc finder button to get the idle pc value. If you're lucky enough it'll end up placing an idle pc value in that text box. I wasn't lucky enough though :)
The image is added and now that router can be used
select a router by clicking the router icon on left and drag a router twice you just created in the workspace area. Then click the link icon on left bottom, click on a router select a slot, then click another router and select another slot . This will link both routers as shown below, Then press the start button and you will see the link red spots becoming green. We all good to go. A router added we can now start simulating with gns3
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