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We can use loopback interface with GNS3 for learning networking. This article will explain “how to add loopback interface” in Windows 7

1. Click Start Menu and type cmd.exe, then right click cmd.exe and click Run as administrator

Command Prompt

2. from command prompt, type hdwwiz.exe and ENTER, another window will appear.

Add Hardware Wizard

 

3. from Add Hardware Wizard, klik Next to continue

Add Hardware Wizard window

 

4. from below window, select “Install the hardware that I manually select from a list (Advanced)” and Next.

Select the hardware

 

5. From the list, select “Network adapters” and Next.

Network adapters

 

6. Last step, from column “Manufacturer” select “Microsoft” and in the column “Network adapter:” select “Microsoft Loopback Adapter” and then click Next

Microsoft Loopback Adapter

 

7. Now in the Control Panel — Network and Internet — Network and Sharing Center — Change adapter settings, you can see new network adapter. You can add new static IP like another network adapter in your laptop/computer.