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When you install VMware Workstation on Windows, it creates several virtual NICs, one of which is directly bridged to a NIC that's connected to the network (somehow, it appears to always be bridged to the NIC that's currently accessing the default gateway).

How do I create such a NIC without install VMware Workstation? I looked into MS Loopback Adaptor but it doesn't appear to be what I need (unless I'm mistaken).

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What are you trying to do? – Zoredache May 31 '12 at 7:24
    
Have a Softphone (VoIP) app that needs to use a separate IP from the rest of the computer. – Yon May 31 '12 at 11:19

One way of doing this, used by software such as colinux/andlinux -and very likely vmware and other virtualization software is to use tap/tun drivers to create a virtual interface and use that - very commonly the drivers that are part of openvpn are used on windows.

You'd naturally need to tweak it to your needs, but here's an example of a C# program that uses the tap/tun interface from openvpn to simulate a remote network

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Quite complex, is there one that doesn't involve coding? – Yon May 31 '12 at 11:39

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