Abstract: A communication device of the present invention performs communication over a network where a session is identified based on a source address set in a frame. The communication device comprises an interface unit for connecting to the network, a management unit for managing a plurality of addresses, a request unit for transmitting a frame including a session establishment request to an authenticator system provided on the network through said interface unit, and an address setting unit for setting one of the plurality of addresses managed by said management unit as a source address of the frame including the session establishment request.

Abstract: A communication device of the present invention performs communication over a network where a session is identified based on a source address set in a frame. The communication device comprises an interface unit for connecting to the network, a management unit for managing a plurality of addresses, a request unit for transmitting a frame including a session establishment request to an authenticator system provided on the network through said interface unit, and an address setting unit for setting one of the plurality of addresses managed by said management unit as a source address of the frame including the session establishment request.

Abstract: In a LAN switch capable of recognizing a VLAN, a plurality of paths are associated with a VLAN having a plurality of same members as components, and frames from the members are mapped to a predetermined path selected from among the paths. Also, a plurality of different VLAN's are associated with a single group composed of a plurality of members, and frames from the members are mapped to a predetermined VLAN selected from among the VLAN's. Furthermore, information of a frame is associated with the group to which a member having transmitted the frame belongs, and the received frame is mapped to the group to which the member having transmitted the frame belongs, based on the information of the frame.