Someone might have the same problem, so let me share it. It is slightly different from the steps explained in this thread:http://7200emu.hacki.at/viewtopic.php?p ... ght=#21774
My steps follow:
1) Set up a Loopback adapter on your PC.
2) The next phase is to bridge the Loopback adapter with your wired/wireless adapter. This is the key to making it all work.
a. Open your Network Connections
b. Use the <Ctrl> to select both the Loopback adapter you just created and your wired/wireless adapter.
c. Right Click and the select Bridge Connections. Windows will then set up a new adapter called Network Bridge (MAC Bridge Miniport). All of the IP settings for your wired/wireless adapter will now show up under the Network Bridge. Not in my case, as I had to configure Bridge Adapter with the same IP settings as physical adapter; didn't pick them up automatically.
d. - Click Start, click Run, type cmd, and then click OK.
- In the command window, type "netsh bridge show adapter"
- Note the number assigned to the wired/wireless and MS loopback adapter and type "netsh bridge set adapter 1 e" where you substitute the number displayed in the previous step for the number 1 in this step. So, do this for the both wired/wireless and MS loopback adapter.
- To double check the wired/wireless and MS loopback adapter cards are correctly set with Force Compatibility Mode enabled, type the "netsh bridge show adapter" command again.
3) At this point follow the instructions in the GNS3 documentation on Communicating with Real Networks. When you have the option to choose your network adapter, choose the Loopback adapter you created.
a. Be sure to give the interface on the GNS3 router that connects to your cloud an IP address that is on the same subnet as your wired/wireless network.
After performing these steps, I was able to ping devices on my LAN and back to GNS3 network.
As my main goal was to be able to run OSPF between GNS3 and my physical LAN (lab environment) , this proves that OSPF is working fine between CISCO ISR 7200 (GNS) and Dell Sonicwall NSA-240, where Sonicwall injects Default Route into OSPF.