I need a network interface that will be completely bound to a usermode program.. No physical card involved. The process will handle all packets sent to this interface, and should be able to send packets out of it, as if the process was a network card.

I didn't find anything that allows me to create such an interface. I noticed that VMWare installs a kernel module to handle its vmnetN interfaces. So the only way I can think of is to create a kernel module for it, not sure where to start though.

Am I missing something? Is there any existing library that allows me to do this? If not, is there an existing module? Or places to look at for examples? Any tips at all would be helpful.

To add a virtual interface with a different IP address , open up the Network Configuration Tool and go to the Devices Tab and then add a new device.

Click on the "New" button and a wizard comes up , select Ethernet Conection , click Forward , select the default NIC , click on Forward and then enter a IP address , subnet mask : 255.255.1255.0 and your default gateway address.

Heheh.. what? No.

Anyways, after four hours of coffee and Google, I found it.

The answer is ethertap, a module which creates an interface tap0 in ifconfig, all I need is to read/write packets on /dev/tap0, exactly what I wanted. Thankies though!