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Dual NICs - Forcing an application to choose one...

Forum General Networking : Network General Discussions - Dual NICs - Forcing an application to choose one...

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ryanmission   10-28-2009 at 07:16:43 AM

Hey,

I have a ASUS P6TD motherboard with Dual Gigabit LAN connections, and i have both of them connected to my gigabit router on the same LAN, 192.168.1.0/24.

I plan on making some registry tweaks to one of my interfaces to optimize TCP transmission between, for example NIC2 and a server on the Internet.

However, i want my NIC1 to be used for normal everyday use.

How can i force an application to use NIC2, but have games, web browsers, etc use NIC1...?

Are there any applications to assist with this?

Thanks

EDIT:

http://img204.imageshack.us/img204/4448/dualnics.jpg


Message edited by ryanmission on 11-05-2009 at 06:16:24 PM
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sturm   10-28-2009 at 12:38:49 PM

Your wasting your time. Your internet connection wont even saturate a 100 meg connection, let alone a gig connection.
Now if the server was local then I could see separating the networks. But if everything will go over the internet then your just wasting time.

------------------------------ I ain't signing nothin
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ryanmission   10-28-2009 at 04:45:08 PM

No im not. I'll be changing a specific interfaces TCP ACK frequency, and on that interface, standard downloads and web browsing will be affected in various negative ways. Thus, i want it to only be used for a specific reason, and i want my other interface to operate normally.

The fact that it's a gigabit interface was irrelevant and i probably shouldn't have mentioned that.

Edit: Thanks for the response though!


Message edited by ryanmission on 10-28-2009 at 04:47:17 PM
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ryanmission   11-04-2009 at 07:31:16 PM

bump.

Added a picture to hopefully better describe what im trying to do..

http://img204.imageshack.us/img204/4448/dualnics.jpg

Reply to ryanmission
ryanmission   11-18-2009 at 05:03:22 AM

I managed to do this.

Instead of using an app to funnel my traffic, i used a persistent route in Windows to the destination i wanted, out the physical interface i wanted.

ex:
route add -p destinationIP destinationMASK nexthopIP if interfaceINDEX
or
route add -p 100.1.1.1 255.255.255.255 192.168.1.1 if 13

on top of this, i had to delete the default gateway for my "modified" interface. however...it would just keep coming back after reboots. SO...instead i re-added the default route as a -p (persistent) with a metric 1 higher than the default route for my NON-modified interface.

As a result of that, windows selects my non-modified interface for all traffic not destined to my persistent route i added for my modified one!

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