Пакет vtund: Информация

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 tasks like VPN, Mobil IP, Shaped Internet access, IP address
saving, etc.  It is completely a user space implementation and does
not require modification to any kernel parts.