METHOD AND APPARATUS FOR ESTABLISHING VIRTUAL PRIVATE NETWORKS

摘要

A VPN apparatus is provided in which decrease of a server load, generation of the communication delays and the communication failure can be constrained to a minimum when the VPN communication starts between the plurality of the VPN apparatuses. In a networking method of a communication apparatus in which global address information and port information are acquired on a network, a virtual private network is established with another communication apparatus using the global address information and the port information to perform the communication, the networking method includes determining (S102) whether communication data that is transmitted from the communication apparatus is a first protocol (UDP) or a second protocol (TGP), and starting a data transmission through the network before the virtual private network is established when the communication apparatus determines that the communication data is the first protocol, and starting a data transmission after the virtual private network is established when the communication apparatus determines that the communication data is the second protocol.