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Gateway system

A gateway and main gateway technology, applied in the field of gateway systems, can solve problems such as impossible communication, and achieve the effect of high gateway redundancy

Inactive Publication Date: 2006-11-01
YOKOGAWA ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0035] In this prior art gateway system, even if a redundant system of the gateway is provided in an attempt to obtain higher reliability to improve the operating rate, if its status information is not synchronized as described above, it is impossible to keep communicating; it's a question

Method used

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Examples

Experimental program
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no. 1 example

[0073] figure 1 is a block diagram showing the first embodiment of the gateway system according to the present invention.

[0074] exist figure 1 Among them, gateways 1, 2 have processing sections 11, 21, synchronization processing sections 12, 22, and storage sections 13, 23. The processing section 11, 21 is a section for processing packets and performs different processing according to the gateway type (gateway 1 or 2); for example, if the gateway is a NAT unit, the processing section performs address translation processing; if the gateway is a firewall unit, The processing part then performs screening; if the gateway is a translator, the processing part performs protocol translation processing, and so on.

[0075] The storage section 13, 23 is a memory in which rule information and state information are stored by the processing section 11, 21. For example, if the gateway is a NAT unit or a translator, the rule information corresponds to address translation rules; if th...

no. 2 example

[0139] Figure 6 is a block diagram showing a second embodiment according to the present invention.

[0140] In a second embodiment, a gateway is added. The structure of each gateway is the same as that explained above, so it will not be discussed again. exist Figure 6 , gateway 2 is not shown for convenience

[0141] Figure 7 is a schematic diagram illustrating a network configuration according to the present invention.

[0142] exist Figure 7 In , server 3 is connected to gateways 1, 2 and 10 through network 6. Client PC4 is connected to gateways 1, 2 and 10 via network 7. In the communication between the server 3 and the client PC4, the gateways 1 and 2 work as a group. At this time, gateway 1 works as a master gateway, and gateway 2 works as a slave gateway. The gateway 10 does not work (power is not turned on, function is invalid, etc.).

[0143] Figure 8 yes Figure 6 Flowchart of the packets in the configuration. combine Figure 6 and Figure 8 The op...

no. 3 example

[0156] Figure 9 is a block diagram showing a third embodiment according to the present invention.

[0157] exist Figure 9 Among them, the gateways 110, 140 are composed of processing sections 111, 141, synchronization processing sections 112, 142, and storage sections 113, 143, like the above-mentioned gateways, and therefore their configuration will not be discussed again. For simplicity, the gateways 120 and 150 described later are not shown in the figure.

[0158] The gateway 130 has a processing section 131 , storage sections 133 a and 133 b , and a synchronization processing section 132 . The processing section 131 and the synchronization processing section 132 are functional blocks similar to the corresponding functional blocks of any other gateway.

[0159] Rule information (not shown) and status information A are stored in the storage section 133 a by the processing section 131 , and status information B is stored in the storage section 133 b by the processing sec...

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Abstract

A gateway system for transiting communications at the boundary between networks includes a master gateway and at least one slave gateway. The master gateway processes a communication packet, updates state information based on the processing of the communication packet, and transmits the updated state information. The slave gateway receives state information transmitted from the master gateway, and stores the received state information as state information of the slave gateway. The slave gateway operates instead of the master gateway based on the stored state information.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority from prior Japanese Patent Application No. 2005-127551 filed on April 26, 2005, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a gateway system used for communication between devices such as computers, and more particularly to a gateway system intended to improve communication reliability. Background technique [0004] As the Internet, corporate intranets, etc. become widespread, it is necessary to provide a stable network. Gateways such as NAT (Network Address Translation) units or firewall units are often introduced at the border between the company intranet and the Internet. In the gateway, address conversion rules, security rules including screening, etc. are set according to the institution's operation policy. [0005] The gateway can also be used as a data transfer (relay) in the system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/46H04L12/66H04L45/586
CPCH04L12/66
Inventor 远藤正仁
Owner YOKOGAWA ELECTRIC CORP
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