How to Install GNS3

1. Double click the GNS3-1.3.9-all-in-one.exe file:

2. If displayed, click the Run button to start the GNS3 installation:

3. The GNS3 Setup wizard displays. Click Next > to start the installation:

4. Click the “I Agree” button to continue the installation:

5. Select the Start Menu folder for the GNS3 shortcut.
The default is the GNS3 folder. Click “Next >” to continue the installation:

6. GNS3 comes with various optional software. By default most software is selected for installation, Uncheck: 1. Wireshark 2. SolarWinds Response and Click “Next >” to continue

7. Click “Next >” to continue the installation: Choose an install location. The default location is C:\Program Files\GNS3. Then click Install:

8. NOTE: If WinPcap is already installed, a warning message is displayed. It is not necessary to reinstall WinPcap. Click Cancel if you do not want to reinstall WinPcap to and go directly to the next step or click OK to continue re-installing WinPcap:

9. Click the “I Agree” button to continue with the installation:

10. Leave the checkbox Automatically start the WinPcap driver at boot time checked and click Install:

11. Click "Finish" to complete the WinCap installation:

12. The GNS3 software is installed. Wait for the process to complete:
Once installation a Completed message is displayed. Click Next > to continue:

13. Select No and Next > to continue:

14. Leave the Start GNS3 checkbox enabled and click Finish to complete the GNS3 installation:

Enjoy..... Congratulations! You have successfully installed GNS3.

How to add Router IOS Image

1. Double click the GNS3 Icon:

2. Once Opened GNS3, in Menu Bar click Edit and select Preferences to open the Preferences window.
or Press ( Ctrl+Shift+P)

3. Click IOS Router then Click New to add a Router IOS image in GNS3.

4. Click Browse and select the Router IOS image that you want to add in GNS3.

5. Select Router IOS Image and Click to Open.

6. Click Yes.

7. In the Name and platform window, specify the name and platform for the IOS image and then click Next.

8. In the Memory Window page, leave its Default RAM size and then click Next

9. In the Network adapters page, Select the slots and then click Next as shown in the following figure.

9. Now Click Idle-PC finder and wait... until found value.
(An Idle-pc value is necessary to prevent IOS to use 100% of your System processor.)

10. Idle -Pc value found... Now click OK and Finish.

11. Click Apply then OK .

12. Setup is successfully completed...
Click the Router Symbol to Check Added Router IOS.

Your First GNS3 Topology

This document explains how to configure a simple GNS3 topology consisting of two Cisco routers.

1. Start GNS3, you will be prompted to create a New project:
Give Project Name and Location where you want to save your project thne Click OK.

2. Open a New Window like this

3. To create a new GNS3 topology, select a group of the Routers, Click on "c3600 Router" now Drag and Drop to the Workspace.

4. Now Select a group of the Switches, Click on "Ethernet Switch" Drag and Drop to add Switches.

5. Now Select a group of "Browse End Devices", and Click on "VPCs" Drag and Drop to add PC.

6. First Click the Add a Link button to start adding links to your topology.
Second: Now Left Click on a R1 Router in your topology to display available interfaces. In this example various Fast Ethernet and Serial interfaces are available.
For example: We Select Serial3/0

7. Then select another device in the topology to connect the interface to. In this example we select Serial3/1.

8. Now complete the connection b/w R1 to R2.

9. Now click again on R1 to Connect the Switch.
In this Exp: we select FastEthenet0/0

10. Now click on Switch 1 and select port no.1 to connect to R1 Router.

11. Click again on Sw1 to connect PC, select Port No.2, then Click PC1 and select Showing Interface Ethernet0.
Now Connect R2 Interface yourself.

12. Now Our Toplogy is Complete,
First: click Add Link button to Stop adding links.
Second: Click the Show/Hide interface labels button on the GNS3 Toolbar to display interface labels in your topology.

13. Click the Start/Resume button to start topology.
Note: After Start topology, GNS3 indicates that the devices have been powered on by turning the interface connectors from red to green.

11. You are now ready to configure your devices.
Double click on R1 to open Router Console Connection. or Righ click and choose Console.