Virtual subnet controller and controlling method thereof
First Claim
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1. A virtual subnet controlling method, which utilizes a virtual subnet controller to connect a public network and a private network including at least one subnet, the method comprising the steps of:
- broadcasting an ARP request by a first station;
responding an ARP response by a second station if the second station is the destination station of the ARP request and is located at the same subnet as the first station;
responding an ARP response by the virtual subnet controller;
transmitting data packets from the first station to the virtual subnet controller; and
transmitting data packets from the virtual subnet controller to the second station.
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Abstract
A virtual subnet controller includes a subnet mapping table and a control unit. When the source and destination stations belong to a public network and a private network, respectively, the NAT protocol is used for converting the IP address of the data packet. After receiving the ARP request froma source station, the virtual subnet controller will respond with an ARP response, enabling the data packet transmitted from the source station.
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Citations
8 Claims
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1. A virtual subnet controlling method, which utilizes a virtual subnet controller to connect a public network and a private network including at least one subnet, the method comprising the steps of:
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broadcasting an ARP request by a first station;
responding an ARP response by a second station if the second station is the destination station of the ARP request and is located at the same subnet as the first station;
responding an ARP response by the virtual subnet controller;
transmitting data packets from the first station to the virtual subnet controller; and
transmitting data packets from the virtual subnet controller to the second station. - View Dependent Claims (2, 3, 4)
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5. A virtual subnet controlling method, which utilizes a virtual subnet controller to connect a public network and a private network including at least one subnet, the method comprising the steps of:
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updating the destination of data packets in an ARP table of a source station as the IP address of the virtual subnet controller;
transmitting the data packets from the source station to the virtual subnet controller; and
transmitting the data packets from the virtual subnet controller to the destination station. - View Dependent Claims (6)
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7. A virtual subnet controller, connected to a public network and a private network including at least one subnet, the virtual subnet controller comprising:
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a subnet mapping table, which uses NAT protocol to convert IP addresses of data packets if source and destination stations belong to a public network and a private network, respectively; and
a control unit, which responds with an ARP response and enables the data packets transmitted from the source station to the virtual subnet controller, and then redirects the data packets to the destination station. - View Dependent Claims (8)
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Specification