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Gateway system and method for processing packet via IP fragmentation in private network

A gateway, private network technology, applied in transmission systems, digital transmission systems, data exchange networks, etc., can solve problems such as inability to correctly process packets cut by IP

Inactive Publication Date: 2006-02-08
INSTITUTE FOR INFORMATION INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a system and method for using a gateway to process and transmit IP-cut packets in a private network, which can solve the various problems of the aforementioned prior art that cannot correctly process IP-cut packets Disadvantages, and the problem that two machines on the private network simultaneously send IP-cut packets with the same identification field value

Method used

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  • Gateway system and method for processing packet via IP fragmentation in private network
  • Gateway system and method for processing packet via IP fragmentation in private network
  • Gateway system and method for processing packet via IP fragmentation in private network

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Embodiment Construction

[0032] For a preferred embodiment of the gateway system and method for processing private network IP-cut packets of the present invention, please refer to Figure 5 The shown system operation architecture diagram includes a first machine 10 and a second machine 20 located in a private network, and a NAPT gateway (NAPT Gateway) 50 of the present invention is used between the private network and the Internet And a third machine 30 located in an Internet, the first machine 10 and the second machine 20 can divide the packets intended to be sent to the third machine 30 through the network into a group of multiple After the packet is transmitted, the NAPT gateway 50 guides the group of divided packets transmitted by a data stream to the third machine 30 .

[0033] image 3 It is a flow chart showing that the gateway 50 transmits a packet cut by IP. First, in step S301, the gateway 50 judges whether a data stream receives a packet cut by IP, and if so, then judges the receiving Wheth...

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Abstract

The invention is brake channel device system and method for processing sealed package cut by personal net path. When a brake channel device receive the first sealed package cut by IP of data flow from personal network, it processes the package according to normal NAPT converting rule, the relative data of sealed package, the converted brake channel device address and the source interface are recorded to a NAPT table, and the IP incrimination of the sealed package are changed into the index value of cutting item in cutting table; when other packages passes through the device, it searches the cutting table with data on the sealed package, and finds out the correspondent cutting item, the NAPT index value recorded by cutting item gets the NAPT item correspondent to NAPT table. According to he NAPT item record, the sealed package source address are converted to the device address and the sealed package IP incrimination is changed into the index value of the cutting item in cutting table.

Description

technical field [0001] The present invention relates to a technology for gateways to transmit IP-cut packets, in particular to a system and method for using a gateway to process and transmit IP-cut packets in a private network. Background technique [0002] Generally, in an IP network, when a packet is sent to the IP layer, if the length of the packet is greater than the Maximum Transmission Unit (MTU), it must undergo IP fragmentation (IP Fragmentation) before it can be transmitted through the interface. Figure 1A Displays three IP packets formed by one packet after IP cutting, Figure 1B It shows that the identification field (Identification) and the source location field (Source Address) of the three IP packets are the same value, to indicate that the three IP packets are obtained by cutting the same packet through IP, and the flag field The MF (More Fragments) bit in (Flags) is "1" indicating that the IP packet has subsequent IP packets of the same group to be cut, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L29/12H04Q3/545H04L45/74
Inventor 林军鼐
Owner INSTITUTE FOR INFORMATION INDUSTRY
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