EP0812086A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Vlan control system and method
Assignee: NTT Inc
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Filing: 1997-06-06
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Granted: —
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Expires: 2017-06-06
Abstract
Abstract A VLAN control system is provided, which comprises: a remote access server (301), connected to a home network (200) in the VLAN having a global network (400), 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 (601; 602), 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 (700), 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.
Inventors
- 👤 Shigeaki Tanimoto
- 👤 Hikoyuki Nakajima
- 👤 Kunihiko Isoda
- 👤 Kouichi Nagai
- 👤 Takashi Masui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 11:28
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/46; H04L12/4641; H04L12/4604; H04L45/00; H04L45/74; H04L45/742; H04L61/00; H04L61/50; H04L61/5084; H04L2212/00; H04W; H04W8/00; H04W8/26; H04W80/00; H04W80/04
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
342 words
A control system for a VLAN in which a home network (200) to which one or more terminals (101, 102) are ordinarily connected, and at least one remote network (501, 502) to which said terminals are connected when they are moved, are connected with each other via a global network (40), said system characterized by comprising: a remote access server (301) connected to the home network, said server having an address for the global network, and in which a management table for indicating a location of each terminal under connection is provided, wherein when one of the terminals is moved to one of said at least one remote network, the remote access server controls access between the terminal and the home network as if the terminal performs the access in the home network; a remote access client (601; 602) connected to each remote network, said client having an address for the global network, and in which a management table for indicating a correspondence relationship between each terminal which is connected to the remote network and the home network is provided, and the remote access client for controlling communication between the remote network and the global network; and a VLAN management server (700) connected to the global network, said server having an address for the global network, and in which 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 is provided, and the VLAN management server for managing packet transmission and the location of each terminal, wherein if one of the terminals is connected to one of said at least one remote network and is managed in the remote network, disconnection of the terminal from the remote network is detected based on timing information of a packet transmitted from the terminal or connection information if the terminal is further moved to another remote network, and processing control for changing management data of the system according to the terminal disconnection is performed via the VLAN management server.
Claim 2
Dependent Claim
70 words
A control system as claimed in claim 1, characterized in that in the detection of the terminal disconnection: every time the connected terminal transmits a packet, the remote access client sets a monitoring timer for the terminal whose timer value automatically increases, and judges that the terminal was disconnected when the timer value exceeds a predetermined threshold value and notifies the VLAN management server of the disconnection of the terminal.
Claim 3
Dependent Claim
136 words
A control system as claimed in claim 1, characterized in that two or more remote networks are provided as said at least one remote network, and in the detection of the terminal disconnection, when one of the terminals is moved from a first remote network (501) to a second remote network (502): when the terminal transmits a packet, the remote access client (602) of the second remote network detects the packet, and notifies the VLAN management server that the terminal has been connected to the second remote network, and the notified VLAN management server searches its own management table, recognizes that the remote network to which the terminal was connected until that time is the first remote network, and notifies the remote access client (601) of the first remote network of the disconnection of the terminal.
Claim 4
Dependent Claim
77 words
A control system as claimed in claim 1, characterized in that in the detection of the terminal disconnection: the remote access client sends a monitoring packet for every predetermined time to each connected terminal which is registered in its own management table, and if a response packet is not returned from a relevant terminal, the remote access client judges that the relevant terminal was disconnected and notifies the VLAN management server of the disconnection of the terminal.
Claim 5
Dependent Claim
34 words
A control system as claimed in claim 4, characterized in that the monitoring packet includes a layer 3 address of the OSI, while the response packet includes a layer 2 address of the OSI.
Claim 6
Dependent Claim
43 words
A control system as claimed in claim 1, characterized in that when the terminal disconnection is detected, the remote access client of the remote network from which the terminal was disconnected deletes information relating to the relevant terminal in its own management table.
Claim 7
Dependent Claim
53 words
A control system as claimed in claim 1, characterized in that when the terminal disconnection is detected: the VLAN management server updates the contents of its own management table, and notifies the remote access server of the terminal disconnection; and the notified remote access server updates the contents of its own management table.
Claim 8
Dependent Claim
20 words
A control system as claimed in any one of claims 1-7, characterized in that the global network is the Internet.
Claim 9
Dependent Claim
20 words
A control system as claimed in any one of claims 1-7, characterized in that the global network is an intranet.
Claim 10
Dependent Claim
136 words
A control method used in a VLAN system in which a home network (200) to which one or more terminals (101, 102) are ordinarily connected, and at least one remote network (501, 502) to which said terminals are connected when they are moved, are connected with each other via a global network (40), said method characterized in that: if one of the terminals is connected to one of said at least one remote network 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 if the terminal is further moved to another remote network; and performing processing control for changing management data of the system according to the terminal disconnection.
Claim 11
Dependent Claim
58 words
A control method as claimed in claim 10, characterized in that the step of detecting the terminal disconnection includes the steps of: setting a monitoring timer for the terminal, whose timer value automatically increases, every time the connected terminal transmits a packet; and judging that the terminal was disconnected when the timer value exceeds a predetermined threshold value.
Claim 12
Dependent Claim
97 words
A control method as claimed in claim 10, characterized in that two or more remote networks are provided as said at least one remote network, and when one of the terminals is moved from a first remote network (501) to a second remote network (502), the step of detecting the terminal disconnection includes the steps of: detecting packet transmission of the terminal; and recognizing that the remote network to which the terminal was connected until that time is the first remote network, and notifying a remote access client of the first remote network of the terminal disconnection.
Claim 13
Dependent Claim
60 words
A control method as claimed in claim 10, characterized in that the step of detecting the terminal disconnection includes the steps of: sending a monitoring packet for every predetermined time to each terminal which is connected to the relevant remote network; and judging that a relevant terminal was disconnected if a response packet is not returned from the relevant terminal.
Claim 14
Dependent Claim
34 words
A control method as claimed in claim 13, characterized in that the monitoring packet includes a layer 3 address of the OSI, while the response packet includes a layer 2 address of the OSI.
Claim 15
Dependent Claim
20 words
A control method as claimed in any one of claims 10-13, characterized in that the global network is the Internet.
Claim 16
Dependent Claim
20 words
A control method as claimed in any one of claims 10-13, characterized in that the global network is an intranet.
Claim 17
Dependent Claim
191 words
A VLAN management server (700) used in a VLAN system in which a home network (200) to which one or more terminals (101, 102) are ordinarily connected, and at least one remote network (501, 502) to which said terminals are connected when they are moved, are connected with each other via a global network (40), characterized in that: said server is connected to the global network, said server has an address for the global network, and in which 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 is provided, and said server manages packet transmission and the location of each terminal, wherein if one of the terminals is connected to one of said at least one remote network and is managed in the remote network, the management server detects disconnection of the terminal from the remote network based on connection information if the terminal is further moved to another remote network, and the management server performs processing control for changing management data of the system according to the terminal disconnection.
Claim 18
Dependent Claim
113 words
A VLAN management server as claimed in claim 17, characterized in that two or more remote networks are provided as said at least one remote network, and in the detection of the terminal disconnection, when one of the terminals is moved from a first remote network (501) to a second remote network (502) and the VLAN management server is notified of terminal connection via the second remote network: the notified VLAN management server searches the management table, 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.
Claim 19
Dependent Claim
29 words
A VLAN management server as claimed in claim 17, characterized in that when the terminal disconnection is detected, the VLAN management server updates the contents of the management table.
Claim 20
Dependent Claim
127 words
A VLAN management method used in a VLAN system in which a home network (200) to which one or more terminals (101, 102) are ordinarily connected, and at least one remote network (501, 502) to which said terminals are connected when they are moved, are connected with each other via a global network (40), said method characterized in that: if one of the terminals is connected to one of said at least one remote network and is managed in the remote network, said method comprises the steps of: detecting disconnection of the terminal from the remote network based on connection information if the terminal is further moved to another remote network; and performing processing control for changing management data of the system according to the terminal disconnection.
Claim 21
Dependent Claim
100 words
A VLAN management method as claimed in claim 20, characterized in that two or more remote networks are provided as said at least one remote network, and when one of the terminals is moved from a first remote network (501) to a second remote network (502), the step of detecting the terminal disconnection includes the steps of: recognizing that the remote network to which the terminal was connected until that time is the first remote network with reference to management information relating to the terminal; and notifying a remote access client of the first remote network of the terminal disconnection.
Claim 22
Dependent Claim
23 words
A storage medium storing a computer program for making a computer execute any one of the methods claimed in claims 20 and 21.
Claim 23
Dependent Claim
163 words
A remote access client (601) used in a VLAN system in which a home network (200) to which one or more terminals (101, 102) are ordinarily connected, and at least one remote network (501, 502) to which said terminals are connected when they are moved, are connected with each other via a global network (40), characterized in that: said client is connected to each remote network, said client has an address for the global network, and in which a management table for indicating a correspondence relationship between each terminal which is connected to the remote network and the home network is provided, and the remote access client controls communication between the remote network and the global network; and wherein if one of the terminals is connected to one of said at least one remote network and is managed in the remote network, disconnection of the terminal from the remote network is detected based on timing information of a packet transmitted from the terminal.
Claim 24
Dependent Claim
59 words
A remote access client as claimed in claim 23, characterized in that in the detection of the terminal disconnection: every time the connected terminal transmits a packet, the remote access client sets a monitoring timer for the terminal whose timer value automatically increases, and judges that the terminal was disconnected when the timer value exceeds a predetermined threshold value.
Claim 25
Dependent Claim
65 words
A remote access client as claimed in claim 23, characterized in that in the detection of the terminal disconnection: the remote access client sends a monitoring packet for every predetermined time to each connected terminal which is registered in the management table, and if a response packet is not returned from a relevant terminal, the remote access client judges that the relevant terminal was disconnected.
Claim 26
Dependent Claim
35 words
A remote access client as claimed in claim 25, characterized in that the monitoring packet includes a layer 3 address of the OSI, while the response packet includes a layer 2 address of the OSI.
Claim 27
Dependent Claim
33 words
A remote access client as claimed in claim 23, characterized in that when the terminal disconnection is detected, the remote access client deletes information relating to the relevant terminal in the management table.
Claim 28
Dependent Claim
108 words
A remote access method used in a VLAN system in which a home network (200) to which one or more terminals (101, 102) are ordinarily connected, and at least one remote network (501, 502) to which said terminals are connected when they are moved, are connected with each other via a global network (40), said method characterized in that: if one of the terminals is connected to one of said at least one remote network and is managed in the remote network, said method comprises the step of detecting disconnection of the terminal from the remote network based on timing information of a packet transmitted from the terminal.
Claim 29
Dependent Claim
59 words
A remote access method as claimed in claim 28, characterized in that the step of detecting the terminal disconnection includes the steps of: setting a monitoring timer for the terminal, whose timer value automatically increases, every time the connected terminal transmits a packet; and judging that the terminal was disconnected when the timer value exceeds a predetermined threshold value.
Claim 30
Dependent Claim
61 words
A remote access method as claimed in claim 28, characterized in that the step of detecting the terminal disconnection includes the steps of: sending a monitoring packet for every predetermined time to each terminal which is connected to the relevant remote network; and judging that a relevant terminal was disconnected if a response packet is not returned from the relevant terminal.
Claim 31
Dependent Claim
35 words
A remote access method as claimed in claim 30, characterized in that the monitoring packet includes a layer 3 address of the OSI, while the response packet includes a layer 2 address of the OSI.
Claim 32
Dependent Claim
21 words
A storage medium storing a computer program for making a computer execute any one of the methods claimed in claims 28-31.
References Cited (Backward Citations)
No citation records indexed.
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