VLAN control system and method
First Claim
1. 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; and
a 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.
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Accused Products
Abstract
A VLAN control system is provided, which comprises: a remote access server, connected to a home network in the VLAN having a global network, for controlling communication between any moved terminal and the home network with reference to a management table for indicating a location of each terminal under connection; a remote access client, connected to each remote network, for controlling communication between the remote network and the global network with reference to a management table for indicating a correspondence relationship between each terminal which is connected to the remote network and the home network; and a VLAN management server, connected to the global network, for managing packet transmission and the location of each terminal with reference to 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. In the control system, disconnection of a terminal which has been moved to a remote network is detected, without any special function at the terminal side, based on timing information of a packet transmitted from the terminal or connection information if the terminal is further moved to another remote network. A VLAN control method corresponding to the above system is also provided.
141 Citations
17 Claims
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1. 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:
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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; and a 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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control method used in a virtual local area network (VLAN) system in which a home network to which one or more terminals are ordinarily connected, and two or more remote networks to which said terminals are connected when they are moved, are connected with each other via a global network, wherein:
if one of the terminals is connected to one of the remote networks and is managed in the remote network, said method comprises the steps of; detecting 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; performing processing control for changing management data of the system according to the terminal disconnection, and wherein when one of the terminals is moved from a first remote network to a second remote network, the step of detecting disconnection of the terminal includes the substeps of; detecting packet transmission of the terminal; and recognizing that the remote network to which the terminal was connected before the terminal was moved is the first remote network, and notifying the remote access client of the first remote network of the disconnection of the terminal. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A virtual local area network (VLAN) management server used in a VLAN system in which a home network to which one or more terminals are ordinarily connected, and two or more remote networks to which said terminals are connected when they are moved, are connected with each other via a global network, said server connected to the global network, 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 a remote access server of the remote network and for indicating a location of each terminal under connection, and said server comprising:
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means for managing packet transmission and the location of each terminal based on the management table; means for detecting connection information which is generated if the terminal, which was connected to one of the remote networks, and was managed in the remote network, is further moved to another remote network; and means for detecting disconnection of the terminal from the remote network based on the connection information. and for performing processing control for changing management data of the system according to the disconnection of the terminal, and wherein in the detection of the terminal disconnection, when one of the terminals is moved from a first remote network to a second remote network and the VLAN management server is notified of terminal connection via the second remote network, said means for detecting connection information searches the management table, and said means for detecting disconnection of the terminal recognizes that the remote network to which the terminal was connected until that time is the first remote network, and notifies a remote access client of the first remote network of the disconnection of the terminal. - View Dependent Claims (17)
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Specification