I have multiple network adapters on my Windows XP system. Is there a way I can establish which adapter Firefox and Internet Explorer are using? Can I force them to use a specific adapter?
Windows – How to determine which network adapter the browser is using? How to change it
browserfirefoxnetwork-adapternetworkingwindows
Best Answer
Your browser isn't choosing which interface your traffic goes through, the network settings in the OS are responsible for that. In this case it would probably depend on what the default gateway was set as. By default all the traffic would go through that unless there was an exception.
If this were linux the answer would simply be 'iptables' but in windows it's a tad more murky. I wish I could answer better, I'm sure someone else will have a better answer, but this should at least get you started.