Abstract: The invention consists in implanting an encapsulation mechanism (ME) in an operator access router, whereby said encapsulation mechanism can calculate a header for messages that the transmitter site (B1) wishes to send to the receiver site (Bn?), said header containing at least one prefix concerning the service provided by the operator, a virtual private network identifier (VPNB), a destination site (Bn?) network prefix and a suffix which consists of a field of bits which can assume any particular value.

Abstract: Disclosed is a method that uses the routing functions of an internet-type protocol by introducing a mechanism assigning prefixes to the IPv6 addresses of the network routers such that the self-configuration process of said protocol can be used due to a mechanism that utilizes a serializer (E). Said serializer (E) delivers the prefixes according to an operational sequence comprising, for each router, an initialization phase, a configuration phase, and a relay phase in which the router is used as an intermediary between the serializer and other routers that are in the configuration phase.