Comments on: How to integrate a Microsoft Loopback interface with GNS3

By: khan

khan — Sun, 07 Mar 2010 06:33:06 +0000

@CJ ..
im facing the same problem mate :S

By: Roy

Roy — Tue, 02 Mar 2010 22:18:04 +0000

I´m struggeling with a scenario with two clouds between three routers in GNS3. Each cloud is connected to two different loopback interfaces and on different subnets. Each loopback are able to ping the next router, but is not able to get futher. Disabling all interfaces on the pc exept for one loopback makes it possible to make my ping packets travel across all the routers. Any sugestion on what to do to be able to run two loopback interfaces on the same pc and still be able to send packets over several routers?

By: CJ

CJ — Sun, 28 Feb 2010 00:21:53 +0000

Hi, I have created a MS loopback and it is connected to my lab router. I can ping from PC to my lab router but not vice versa. Do you have any idea?

By: khan

khan — Tue, 23 Feb 2010 10:03:25 +0000

Hi,
For those who are getting these messages after opening network device list file
———————————————————–
Network adapters on this machine:

The system cannot find the path specified.

Use as follows:
F0/0 = NIO_gen_eth:\Device\NPF_{…}

Press any key to continue . . .
——————————————-
Network adapters on this machine:

Unable to create lock file “c7200_i0_lock”.
VM default: unable to create instance!
C7200: unable to create instance!

Use as follows:
F0/0 = NIO_gen_eth:\Device\NPF_{…}

Press any key to continue . . .

———————————————–

For those who are facing these two problems with loopback adapter when using windows VISTA needs to do the following.
-After installing loopback adapter
goto its properties and only put checks on:

- Client for MS network
-IPV4
-Link layer topology discovery mapper
-link layer topology discovery responder.

-Disable USer control frm control panel> user account.
Restart the system.
Run GNS3 as administrator…
Run network device list as administrator

Hopefully now you will be able to see the network adapters attached with your system.

By: Khan

Khan — Tue, 23 Feb 2010 09:36:17 +0000

@ Josh
After i read some of the comments i tried to run the file by using administrator access but now i m getting a different message.
The system cannot find the path specified.
USe as follows …….

Im using VISTA with administrator rights…

Thnkss

By: Khan

Khan — Tue, 23 Feb 2010 09:29:28 +0000

Hi josh,
I ve seen many of your tutorials and i must say u are doing a gr8 job by providing these tutorials. I jst seen your tutorial about loopback interface. I wanna ask that when i m running the file :network device list: to get info for my loopback adapter, it is not showing me any information except the following :

Unable to create lock file “c7200_i0_lock”
VM default: unable to create instance!
c7200: Unable to create instance.
I am using Windows Vista. Can you please tell me any alternate way to get the information about my loopback adapter. I deleted the GNS3 and reinstalled it without any IOS images to first get the loopback adapter but invain :S

Thanks man and keep it up.

By: Louis

Louis — Mon, 01 Feb 2010 12:18:03 +0000

Hi,
Am using vista home premium and have followed your video sequentially but still can’t connect microsoft loopback to GNS3.

I equally installed openVPN, but this shows network cable unplugged, even though I have configured my cloud in GNS3.

Need all the help I can get from you.

Thanks so much.

By: Benja

Benja — Thu, 28 Jan 2010 13:09:43 +0000

The Windows 7 loopback issue. Delete the cloud from the topology, save it and restart the computer. Then right-click on gns3 and run as admin. Run network device list.cmd as admin too. Don’t ask me why but (after wasting 2 hrs), it just works!!!

By: sam

sam — Sat, 09 Jan 2010 09:58:33 +0000

Please help,this is the problem i’m experiencing.i’m windows 7.

Network adapters on this machine:

Unable to create lock file “c7200_i0_lock”.
VM default: unable to create instance!
C7200: unable to create instance!

Use as follows:
F0/0 = NIO_gen_eth:\Device\NPF_{…}

Press any key to continue . . .

By: Ken

Ken — Tue, 29 Dec 2009 06:56:31 +0000

A little more research, and I found out the problem I was having (and I suppose everyone else is having, as well).

Be sure to check your firewall (whether it’s Windows, Norton, etc.). If you are blocking incoming ICMP, then your firewall will stop GNS3 from pinging your loopback.

I ended up having to add an Allow incoming ICMP requests on my Norton firewall, and it worked like a charm.