Method and system to deploy on the fly and on demand at least one virtual network.

The invention relates to a method for generating, on the fly and on request, at least one virtual network (402, 404, 406) suitable for a particular purpose in a physical network (200), said core network comprising nodes physical (204, 206, 208, 210), each of said physical nodes (204, 206, 208, 210) executing at least one network operating system, said method comprising the steps of: - determining at least one computer equipment ( 202), said virtual network server, data relating to said virtual network (402) to generate a function of said particular purpose, - transmission, based on said data, a creation request from a virtual node in at least a portion said physical nodes (204, 206, 208, 210), said active nodes, said core network (200); and - creating a virtual node on each of said active nodes by implantation of a virtual device in each of said active nodes, said virtual network consisting of all of said virtual nodes created. It also relates to a system using open No such process.