Multiple NICs to do throughput testing

Microsoft Windows xp professional w/serv...
August 19, 2010 at 07:37:35
Specs: Windows XP

I have a computer with 3 total NICs. One is connected to the LAN and I can't touch it. The remaining two are available for my use. Without going into too much detail, what I effectively need to do is connect these two NICs to an external network device under test and use the PC to move traffic through it. The problem is, any network traffic I want moved out of one NIC and eventually back into the other simply gets routed internally. I've done some research and this seems like a difficult problem to solve. Using a second computer would solve it, but that's not ideal.

Currently I'm using NTttcp to do throughput testing on the device under test, if that helps. Thanks in advance.

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August 19, 2010 at 08:36:01
It might just be me (it's after 1.00 a.m. here), but your post is a little unclear.

Are you trying to basically create a router? If so, I did it a few years back with 5 NIC's and a linux installation (not sure which flavor now, old age is creeping in).

Or, is this in order to test network performance? Have you try stopping the "routing and remote access" service (assuming Windows is being employed here)?

Maybe if I get some sleep and re-read your post in the morning, I'll understand what you need to accomplish more clearly. I apologise for any confusion I might have introduced to this thread.

Please let us know if you found someone's advice to be helpful.

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August 19, 2010 at 09:10:52
Hi thanks for your reply. I'm not trying to create a router, but instead I have a network link which I would like to test the throughput of. This is not some standard Ethernet link, but rather for industrial/auto use, however it has standard RJ45 Ethernet jacks to connect to the "normal" world. So, I want to use the two PC NICs to connect to each end of the "link under test" and send data thru it for testing

The OS is WinXP. I will take a look at the routing and remote access service.

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August 25, 2010 at 08:49:25
it would appear you are trying to test bandwidth THROUGH the device. One nic would send and one nic would listen to the device.

I don't see how you can do this without specially written software on your pc and a special configuration on the external device you are testing.

Normally you use one pc nic and one device nic.

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