P The invention relates to a method of accessing a network or a service using a protocol from the PPPoX family of protocols, which, for a connection request from the terminal of a client (11), comprises: a step for authenticating the latter, comprising the transmission of the identifier and password parameters of this client and of a line identification parameter (ULID) used by this client, to a server authentication (15), a step of comparing this line identification parameter with a value stored in the database (16) of the authentication server (15) to allow acceptance or rejection, by this server for this client's connection request. The invention also relates to an architecture making it possible to implement such a method. /P
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