This will route IP packets from one place to another over a single IP connection made using UDP or TCP
To use this app you’ll need two copies, one on a machine in each office. You will also need to install WinPCAP on both PCs. It must be possible to route either TCP or UDP between the machines running this app. Usually this can be done by forwarding a single TCP port on just one of the routers. This app pretends to be an entirely seperate machine on the LAN. The IP and MAC address of this virtual machine are configurable. Machines in the offices use these virtual machines as the router to the other office, all traffic is then sent over a single TCP connection. For security, the TCP connection could be made using SSH, Google for OpenSSH and Putty to see how this can be done
Visit Here for more.