I have to test both USB and ethernet interface simultaniously... But on connecting both USB and ethernet cable simultaniously, traffic takes only ethernet path (USB interface is totaly ignored)....If I remove the ethernet cable, then only traffic is moving through USB interface. I am testing using ICMP traffic.. I have given different LAN IP address for both the interfaces . I am working in windowsXP.
I would recommend that you go to the microsoft website and take a look at the DevCon utility. You should be able to have full control over your ports and network adapters with that. http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q311272
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them