Dual Internet connections and Utorrent attempt

wannabedamned · 25 Mar 2010 at 12:13

Okay just want to check if this sounds about right to you guys.

I have a laptop that can connnect to my neighbours wireless(Legit, not stolen, secured and shared with me, etc) I also have a adsl line of my own.

I also have a desktop computer with 2 network points.

Now, what i want to do is use my laptop to connect to the wireless, then connect the laptop to my desktop PC using a cross over cable. I will then, bridge the connections on the laptop.

This should technically mean my PC then has 2 incoming internet connections, Over 2 seperate LANs yes?

I then plan on running multiple instances of Utorrent and using the advanced settings altering the net.outgoing_ip address on each instance to the LAN Addresses of each network.

Now this is all theory, as I dont have a cross over cable to test it, I just wanted to see if anyone has done anything similar? Or if from reading what I've put they see where I'm coming from, and that this should work?

I hope what I've written is understandable to some

I know another option with the same setup, would be to just use the Laptop to download to a shared folder on my Desktop, But this is more of a fun "I wonder if it would work" Experience, and it would also mean in the future, I could put a wirelesss card in my PC and do the same thing, With just 1 system running.

PistolPete · 25 Mar 2010 at 14:10

I can see this going horribly wrong very quickly.

If you going via your laptop then the neighbours wireless router there is double nat going on, and the routing tables might get a tad confusing.

If you are sure you want to do this I'd be tempted to get a cheap USB wireless card and connect directly rather than via bridging on the laptop.

Also remember that all the network subnets have to be different too.

bigredshark · 25 Mar 2010 at 16:10

I'm guessing no it won't as modifying outgoing IP won't do anything to effect the routing, you'd need to actually bind it to the IP (and even then I can't think of a way to make the routing work in Windows). Setting outgoing IP to the other connections WAN address might work (if you're ISP is rubbish and doesn't do uRPF, which they really should) but it's not in any way advisable.

The only easy way would be to run the second instance in a VM and bridge it's network connection onto the second internet connection.

What you're trying to do does come under the category of criminally bad network design in my book however...

matthab · 25 Mar 2010 at 17:37

Sounds Ok to me. If you put outgoing IP and put the IP of the nic on the desktop it should work fine. Like this:

Desktop nic 1 (192.168.0.0) >>>>>> Router/Modem>>>>> internet
Desktop nic 2 (192.168.1.0) >>>>>> Wireless laptop (192.168.0.0) >>>>> Router/Modem >>>>> Internet.

Remeber all bridging does is act as a switch. Im more concerned about the moral aspects of using you neibours network for illegal activity.

Caged · 25 Mar 2010 at 19:16

Surely if you use your laptop to bridge the connection as opposed to routing it then you're going to have two DHCP servers on the network and a ton of problems?

matthab · 27 Mar 2010 at 12:34

Not really. Windows/NICS by default use the connection with the greatest administrative link which is the link with the best connection.

bigredshark · 27 Mar 2010 at 17:39

matthab said:
Sounds Ok to me. If you put outgoing IP and put the IP of the nic on the desktop it should work fine. Like this:

Desktop nic 1 (192.168.0.0) >>>>>> Router/Modem>>>>> internet
Desktop nic 2 (192.168.1.0) >>>>>> Wireless laptop (192.168.0.0) >>>>> Router/Modem >>>>> Internet.

Remeber all bridging does is act as a switch. Im more concerned about the moral aspects of using you neibours network for illegal activity.

Doesn't help much, absent static routes for certain subnets you can still only have one gateway primary so all outgoing traffic will go one way and because whichever router it uses will NAT it all the return traffic will come that way too. As by nature torrent traffic will be virtually impossible to add static routes for that's out.

The only real way is to put each utorrent instance in a segmented network stack with it's own routing table. With Windows I'm going to guess that's impossible and given the OP is asking here I'm guessing his unix skills aren't up configuring in on Linux.

You could feasibly do some kind of PBR on a firewall/router too but again that's complex and unless you have existing knowledge probably not even worth thinking about.

If you really must do this then just run the other instance on the laptop...

Arsey 2 · 28 Mar 2010 at 00:28

Hmm, this sounds plausable, it is along the lines of what I have been doing at uni with multiple ethernet lines (one via powerline adaptor the other via direct connection to switch)

However what you may find is that both Utorrent's will bind themselves to the same network adaptor...

A decent solution to this is a program called Force Bind IP- can be found here- http://www.r1ch.net/stuff/forcebindip/

worked well with binding Download managers to a different NIC

SiriusB · 28 Mar 2010 at 02:29

Assuming for the moment you really do have permission to share your neighbour's wireless [highly dubious about that, what's the benefit to him or you if you already have a broadband connection?], would he appreciate you caining his broadband downloading your porn?