Windows XP – How to Force Applications to Use Specific Network Connections

networkingwindows xp

Let's say I have two active network connections that let me out to the internet.

I want certain applications to only use Network Connection 1, while some others should use Network Connection 2.

Is this possible in Windows XP? If so, how can it be done?

Best Answer

ForceBindIP - Bind any Windows application to a specific interface (by IP or GUID).

ForceBindIP is a freeware Windows application that will inject itself into another application and alter how certain Windows Sockets calls are made, allowing you to force the other application to use a specific network interface / IP address. This is useful if you are in an environment with multiple interfaces and your application has no such option for binding to a specific interface.

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If you only need to reach a few computers, all of which are connected to the same router on the 2nd network then you could also configure it to use a static IP address with no gateway. Without a gateway you will only be able to communicate with devices on the same subnet and connected to the same router (ie: broadcast mode).

You can technically also do this under DHCP by deleting the 0.0.0.0 route for the interface using the ROUTE DELETE command line tool for editing routes, but you would need to do that every time your IP is renewed, so changing to a static ip address is much simpler. Just pick a static IP that is not in use and it should work just fine.

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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

Let's say I have two active network connections that let me out to the internet.

Best Answer

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