Purpose of a loopback adapter
the purpose of a loopback adapter is to communicate as if you were on a real network.
To create a loopback adapter in Windows 7 follow the following steps:
Step 1: Click Start and type in the following command: Hdwwiz.exe
Step 2: Next
Step 3: Install the hardware that I manually select from the list. Next
Step 4: Go to Network Adapters and click next
Step 5: Select Microsoft and select Microsoft Loopback adapter. Next
Step 6: Next and after install click finish.
Step 7: Go to Control Panel, Network and Sharing Center.
Step 8: Click on Change adapter Settings.
Step 9: Select Microsoft Loopback Adapter
Step 10: Configure Static Ip address.
2 Tips which can be handy:
1. Remember to successfully communicate with Loopback adapters be sure to run GNS3 with Administrative privileges.
2. If you are having problems turn off the local firewall to determine if the firewall is blocking traffic.