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I have a PC with different network adapters that provides different internet connections.

How can I setup Firefox (or another browser) to access certain site using one network adapter and other site using another adapter?

Or more in general, how can I force a software application to use a network connection and another software to use another connection?

My OS is Windows XP.

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2 Answers 2

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In general, it is the operating system, not the application, that decides which network adapter to use, based on target IP-addresses.

If you can arrange that the different adapters are on different subnets, you can set up static routes for the IP-addresses of the websites.

I guess most PCs have their IP-addresses allocated by the local router. These can be configured so that a multi-homed PC gets different subnets for different interfaces.

   ISP1........Router1----------PC----------Router2........ISP2
                       subnet1     subnet2
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Get the IP addresses from the sites/destinations you want to reach and block them in the firewall over the other network, that way there is only one way (the one you let open) to reach the destination.

If you have a more advanced firewall you might be able to block certain aplications in it, that way the whole aplication has to use the other adapter.

The above will sadly also mean other computers in your network won't be able to reach the blocked sites

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