Vita: simple and fast VPN gateway to interconnect your LANs

For each pair of Vita gateways, a separate secure tunnel (route) can be established—“can be” because a Vita network does not need to be a full mesh, instead arbitrary hierarchies are supported on a route-by-route basis. It can be as simple as adding an entry to the IP routing table of your default gateway, to ensure that packets to destinations within your private network are routed over an extra hop: the Vita gateway. To configure a Vita route, you need to specify the address prefix of the destination subnetwork, and the public IP address of the target Vita gateway (in addition to the pre-shared key).

Source: github.com