Patent ID: 8488569

Claim:
A user terminal which performs communication over a network where a session is identified based on a source address set in a frame, comprising: a memory to store a session management table to manage a plurality of physical addresses assigned to the user terminal; a physical port to connect to the network; a plurality of logical ports each being assigned with a distinct address selected from the plurality of physical addresses; and a processor to transmit a frame including a session establishment request to an authenticator system provided on the network through said physical port and to set one of the plurality of physical addresses assigned to the user terminal to a source address of the frame including the session establishment request, the source address being free of assignment to any established session to receive a notification of success in an authentication from the authenticator system; to update the session management table to manage corresponding relations between a new session established by the success in the authentication and information for identifying the logical port assigned with the physical address included in the session establishment request; and to transmit another frame utilizing the new session through the logical port corresponding to the new session by referring to the session management table.