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Old 04-09-2010, 04:36 PM   #1
lgp171188
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Question Port forwarding in Bittorrent client in internal network with nat


I have an internal network behind a server <10.0.0.1> connected to the internet that NATs my ip <10.17.11.88> only. NAT is not allowed to any other ip addresses. When I use Transmission Bittorrent client to download torrents, I saw this in the message log and I couldn't understand it

Code:
Sat Apr 10 02:28:39 2010	     	Port Forwarding (UPnP)	Found Internet Gateway Device "http://10.20.0.244:2869/"
Sat Apr 10 02:28:39 2010	     	Port Forwarding (UPnP)	Local Address is "10.17.11.88"
Sat Apr 10 02:28:44 2010	     	Port Forwarding (UPnP)	Port forwarding through "http://10.20.0.244:2869/", service "".  (local address: 10.17.11.88:51413)
Sat Apr 10 02:28:44 2010	     	Port Forwarding (UPnP)	Port forwarding successful!
Sat Apr 10 02:28:44 2010	     	Port Forwarding	State changed from "Not forwarded" to "Forwarded"
The thing is that this 10.20.0.244 is not my machine and doesn't have access to the internet at all. What is happening here? Can anyone help me?
 
Old 04-09-2010, 06:51 PM   #2
smoker
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Have you got a router ?
 
Old 04-09-2010, 06:54 PM   #3
lgp171188
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Quote:
Originally Posted by smoker View Post
Have you got a router ?
Yeah the server with the public IP through which I have nat for my local ip is connected to the internet through a cisco 2600 series router with a public ip address
 
Old 04-09-2010, 07:05 PM   #4
smoker
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So what's the problem ?
Code:
Port Forwarding (UPnP)	Found Internet Gateway Device "http://10.20.0.244:2869/"
...
Port Forwarding (UPnP)	Port forwarding through "http://10.20.0.244:2869/", service "".  (local address: 10.17.11.88:51413)
If your machine is not the gateway then the ip listed must be the gateway, or the front end server.

Last edited by smoker; 04-09-2010 at 07:09 PM.
 
Old 04-09-2010, 07:10 PM   #5
lgp171188
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Gateway as in? The mentioned ip of 10.20.x.x has no access to the internet then how does it become an internet gateway device?
 
Old 04-09-2010, 07:17 PM   #6
smoker
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Do you know what a gateway is ?
Your machine connects to another machine that connects to a GATEWAY.
The gateway is the router.
UpnP will create a virtual device to cope with connections.
If you don't like it, turn UPnP off and deal with the hassle yourself.
Universal Plug And Play
 
Old 04-09-2010, 07:20 PM   #7
lgp171188
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Yeah I seem to be able to get it now. Then the message means that another unknown local ip address that is created for UPnP is also mine, but created for the purpose of managing connections right?
 
Old 04-09-2010, 07:25 PM   #8
smoker
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The whole point of UPnP is that you shouldn't even see this stuff going on. It's good that you spotted it, but don't freak out because it's not traceable. Too many people question things that are done for their own good.
If you're worried, try accessing that ip from outside your network by "normal" means.
 
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Old 04-09-2010, 07:29 PM   #9
lgp171188
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Thank you for the patient explanations. I shouldn't be worried because it is not going to be possible to access that ip from outside.
 
  


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