VTun provides the method for creating Virtual Tunnels over TCP/IP networks and allows to shape, compress, encrypt traffic in that tunnels. Supported type of tunnels are: PPP, IP, Ethernet and most of other serial protocols and programs. VTun is easily and highly configurable, it can be used for various network task like VPN, Mobile IP, Shaped Internet access, IP address saving, etc. It is completely user space implementation and does not require modification to any kernel parts. Note that the encryption used by VTun is quite weak; see http://off.net/~jme/vtun_secu.html for details.