tuntaposx 20090913

The TunTap project provides kernel extensions for Mac OS X that allow to create virtual network interfaces.

From the operating system kernel`s point of view, these interfaces behave similar to physical network adapters such as an Ethernet network interface.

However, the virtual interface does not send the packets into a wire, but makes them available to the programs that are running in the system.
                   
TunTap comes as a pair of kernel extensions that create virtual network interfaces  on the IP and Ethernet level, respectively. These kind of network interfaces are commonly referred to as tun and tap devices on Unix-like platforms.

This way of interfacing with the operating system`s network stack is available on many platforms.