Patent ID: 6075776
Filing Date: 2000-06-13
Classification: H04L,H04W

Abstract:
A control system for a virtual local area network (VLAN) in which a home network to which one or more terminals are ordinarily connected, and at least one remote network to which said terminals are connected when they are moved, are connected with each other via a global network, said system comprising:a remote access server connected to the home network, said remote access server having an Internet Protocol (IP) address for the global network, and also having a management table for indicating a location of each terminal under connection, wherein when one of the terminals is moved to one of said at least one remote network, the remote access server performs a control necessary for said one of the terminals to access the home network as this terminal did before it moved to another remote network;a remote access client connected to each remote network, for controlling communication between the remote network and the global network, said remote access client having an IP address for the global network, and also having a management table for indicating a correspondence relationship between each terminal which is connected to the remote network and the home network; anda VLAN management server connected to the global network, for managing packet transmission and the location of each terminal, said server having an IP address for the global network, and also having a management table for indicating a correspondence relationship between each terminal and the remote access server and for indicating a location of each terminal under connection,wherein if one of the terminals is connected to said at least one remote network and is managed in the remote network, the remote access client detects disconnection of the terminal from the remote network based on timing information of a packet transmitted from the terminal or connection information which is generated if the terminal is further moved to another remote network, and the remote access client then informs the VLAN management server of the disconnection, andwherein the VLAN management server informs the remote access server of the disconnection and performs processing control for changing management data of the system according to the terminal disconnection.