Data transmission method and device in a unidirectional network

A data transmission method and one-way network technology, applied in the field of data transmission method and device in one-way network, can solve the problems of slow data transmission rate and difficulty in ensuring real-time performance, so as to improve reliability and real-time performance, and speed up transmission rate Effect

Active Publication Date: 2019-05-14
武汉凌久微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a one-way network transmission method and device, which are used

Method used

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  • Data transmission method and device in a unidirectional network
  • Data transmission method and device in a unidirectional network
  • Data transmission method and device in a unidirectional network

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0035] see figure 1 , a schematic flowchart of a data transmission method in a one-way network provided by an embodiment of the present invention, including:

[0036] S101. Acquire a frame of message in the two-way network, and extract key field information in the message according to the network protocol that the message complies with, wherein the key field information includes at least the destination physical Address, destination IP address and destination port number;

[0037] In a two-way network, TCP / IP protocol is used for communication between data packets (supporting timeout retransmission mechanism), and the packets are collected, and the destination physical address, IP address and destination port number in the packets can be analyzed.

[0038] S102. Match the feature information of the target machine with the key field information, and identify the protocol name adopted by the message when the feature information of the target machine can match the key field info...

Embodiment 2

[0061] A data transmission method in a unidirectional network is mainly described above, and a data transmission device in a unidirectional network will be described in detail below.

[0062] Figure 4 A structural diagram of an embodiment of a data transmission device in a unidirectional network in an embodiment of the present invention is shown, and the device includes:

[0063] The media access controller A410 is used to connect the host computer in the bidirectional network, collect the message and transmit it to the frame buffer unit and the information extractor.

[0064] exist Figure 4 Among them, the media access controller A410 and the media access controller B480 are generally integrated in the FPGA for communicating with the external Ethernet PHY. The media access controller A410 is used to connect the device with the host in the two-way network, send the received message to the frame buffer unit 420 and the information extractor 430, and send the data frame sent...

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Abstract

The invention discloses a data transmission method and a data transmission device in a unidirectional network, which are used in the field of network communication. The method provided by the invention comprises the following steps: obtaining a frame of message in a bidirectional network, and extracting key field information in the message; matching the feature information of the target machine with the key field information, and when the feature information of the target machine can be matched with the key field information, identifying a protocol name adopted by the message; responding to acorresponding response message according to the protocol name; when protocol name is TCP, if yes, identifying the state identifier of the TCP; Treceiving a message sent by a one-way network end, carrying out corresponding state change, comparing a TCP serial number and an expected TCP serial number received in the message, responding to an ACK confirmation message if the serial numbers are equal,calculating the checksum of a TCP data part of the message, combining a new UDP message, and sending the new UDP message to a target machine of the one-way network end. According to the method, the problems of poor real-time performance and low transmission speed of a traditional data ferrying method are solved, and the transmission reliability and real-time performance are improved on the premiseof ensuring the data transmission safety.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a data transmission method and device in a unidirectional network. Background technique [0002] In network communication, a large number of network attacks are carried out on network connections. In the process of one-way network transmission, since a TCP connection pair cannot be established, network security can be guaranteed to a certain extent. However, one-way network transmission cannot support the timeout retransmission mechanism, so it is difficult to guarantee the reliability of one-way network communication. [0003] Aiming at the problems existing in the current one-way network transmission process, the more commonly used solution is to adopt the data ferry strategy: the FPGA chip of the external switch card periodically polls and finds that the external switch host has a readable cache (sending cache), and then uses the cache After being transmitted to the inter...

Claims

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Application Information

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IPC IPC(8): H04L29/06
Inventor 程振洪曾田阮航王炜
Owner 武汉凌久微电子有限公司
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