CN102231658A - Safe communication method of internetwork isolation apparatus - Google Patents
Safe communication method of internetwork isolation apparatus Download PDFInfo
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- CN102231658A CN102231658A CN2011101528603A CN201110152860A CN102231658A CN 102231658 A CN102231658 A CN 102231658A CN 2011101528603 A CN2011101528603 A CN 2011101528603A CN 201110152860 A CN201110152860 A CN 201110152860A CN 102231658 A CN102231658 A CN 102231658A
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Abstract
The invention relates to a safe communication method of an internetwork isolation apparatus. The method comprises the following steps: (1), detecting a file size; if the file size is less than 9KB, stepping into a step (3); if the file size is larger than 9KB, stepping into a step (2); (2), splitting the file into pieces, which means the file is split into a plurality of pieces according to a standard of 9 KB of each piece; (3), packing the file or file pieces into a frame or frames; (4), establishing network connection based on socket and sending the frame or the frames to a receiving end according to a frame number or frame numbers; if the sending is completed, storing the frame or the frames; if the sending is failed, carrying out resending immediately; if continuous sending is failed for N times, returning the failure information; (5), receiving data of one frame and carrying out processing by the receiving end; (6), carrying out processing on feedback information by a sending end. The safe communication method provided in the invention has the following advantages that: 1, safety of communication is effectively improved by employing the communication mechanism; 2, for large file transmission, a problem that the whole large file has to be retransmitted due to an error of data of one frame is solved, so that communication efficiency is enhanced; 3, functions of automatic retransmission and complementary transmission of data based on a frame are realized.
Description
Technical field
The present invention relates to power monitoring and Automated Technology in Office field, specifically is a kind of safe across a network spacer assembly communication means.
Background technology
Economic and commercial committee [2002] the 30th command spells out, and when interconnected, must adopt special use, reliable safe isolation facility through the national departments concerned authentication with network mode between each electric power monitoring system and the office automation system or other information systems.
For many years, be subjected to the influence of the characteristics of electrical network wide area distribution, the region that the production management of electric power system distributes according to electrical network, the features such as electric pressure of electrical network, electrical network is divided into a plurality of subnets of hierarchical block, for network security problems such as anti-locking system invasion, information-leakages, use network isolating device between each subnet.When having solved safety problem, a new problem having appearred also: when using network isolating device, how to guarantee to transmit the correctness of data.
When busy or network has fluctuation when network, the positive and negative spacer assembly of producer commonly used all can have certain probability the situation of packet or data packet transmission mistake to occur losing in the transmission data procedures on the market at present, thereby do not having under the situation of manual intervention, can not guarantee the correct transmission of each data.
Common across a network spacer assembly communication at present all is to adopt directly data are sent to destination, owing to spacer assembly carries out Packet Filtering when the intercommunication and carries out reason such as data relay by virtual IP address, this method is difficult to guarantee the normal transmission of data.Under most of situation, data can both arrive destination, but when network load has fluctuation than big or network, the error code and the data packet loss of certain probability will appear in data, when if the packet that sends is bigger, the error rate can be bigger, and the spacer assembly of some producer the possibility of error code and packet loss to occur bigger.If this occurs, transmitting terminal be detect less than, Tong Xin correctness and integrality just can not guarantee like this.Because spacer assembly intercommunication mechanism, occur sometimes that transmitting terminal sends successfully but receiving terminal is not received data conditions, thereby more increased the uncontrollability of whole communication process.
Summary of the invention
Consider above-mentioned problem, the invention provides and a kind ofly utilize big file to split, will send that data encapsulate again, the implementation method of the across a network spacer assembly communications security that reduces file transfer mistake probability greatly of reverse feedback file reception condition.
A kind of safe across a network spacer assembly communication means comprises the steps:
1) detects file size, if file less than 9KB, then need not split, enter step 3)) if file more than or equal to 9KB, then enters step 2;
2) file splits into piece, and file is split into some by the 9KB size; Reason by the fractionation of 9KB size: network isolating device has requirement to the packet size of communication, the matching requirements difference of different model, generally speaking, each packet is no more than 10KB can satisfy common on the market network isolating device, therefore split by 9KB here, wherein frame head and the postamble in the next procedure preserved in the 1KB space of reserving;
3) with file or blocks of files packing framing, be about to file or step 2 in the step 1) less than 9KB) in blocks of files add frame head and postamble, form Frame;
4) network of setting up based on socket connects, and above-mentioned frame is sent to receiving terminal by frame number, if be sent completely then preserve frame; If send failure then repeating transmission immediately, send failure continuously and then return failure information N time;
5) receiving terminal receives and carries out following processing behind the frame data:
A) verification frame head postamble is if the verification failure then abandons this frame;
B) separate file piece content;
C) verification file piece content size;
D) with CRC algorithm verification file piece content;
E) after verification is finished,, then preserve blocks of files content and frame number if the blocks of files content is correct; If blocks of files content verification failure abandons this frame;
Whether when f) receiving last frame, it is complete to detect the frame of receiving before by frame number, if do not leak frame, then file receives successfully, feeds back successful information to transmitting terminal by the reverse isolation device simultaneously; If find to leak frame, then needs are mended the frame number that passes and feed back successful information to transmitting terminal by the reverse isolation device;
6) transmitting terminal is pressed following processing feedback information:
If a) feedback information is successfully, this frame of buffer memory discharged before transmitting terminal was then incited somebody to action, and whole process of transmitting is finished;
B) if feedback information is failure, and with frame number, transmitting terminal is then mended according to frame number and is passed frame;
C) after all frames all are sent completely,, then think to send the file failure if in feedback information is waited for the time limit, do not receive feedback information.
Frame head comprises in the described step 3):
Frame identification: fixed code+sign, wherein fixed code accounts for 4 byte spaces, and sign accounts for 1 byte space, and sign is used for marking whether to be start frame, end frame;
Frame number: the sequence number of frame is a numeral that increases progressively, and accounts for 4 byte spaces;
Blocks of files size: account for 2 byte spaces;
The compression sign: whether blocks of files is compressed, and accounts for 1 byte space;
Time-out time: after Frame sent, if also do not feed back successful information after exceeding this time, transmitting terminal was then retransmitted, and accounts for 4 byte spaces;
The verification of piece content: the blocks of files content adopts the CRC algorithm coding to become 4 bytes, is used for the verification of receiving terminal to the blocks of files content.
Blocks of files in the described step 3) is and is used for depositing step 2) content of the file fritter that splits into; Postamble in the described step 3) is a fixed code, accounts for 4 byte spaces.
Preferably, described N=5, this is the optimum value when taking all factors into consideration the requiring of fail safe and communication efficiency.
Preferably, described feedback information waits for that the time limit is preferably 10 seconds.
The present invention guarantees the correctness and the integrality of data from three aspects.
1. the fractionation of big file.The small documents that big file is split into several fixed sizes sends, thereby solves the transmission failure that causes too greatly owing to each frame data.
2. send the encapsulation again of data.In communication process, the data that transmitting terminal will send, after receiving terminal is received data are tested form by sending after the certain format encapsulation again, thereby have solved the situation of data error codes.
3. reverse feedback file situation about receiving.After receiving terminal receives the data of all frames, whether receive success to the transmitting terminal feedback file by the reverse isolation device.If take defeat, then the frame number of erroneous frame and leakage biography is fed back to transmitting terminal, the information that transmitting terminal comes according to feedback is carried out the repeating transmission of frame and is reissued, thereby guarantees the correctness and the integrality of whole communication.
Therefore, the present invention has following advantage:
1. adopt this communication mechanism to effectively raise the fail safe of communication.
2. for the transmission of big file, solved because the problem that a frame data mistake causes whole big file all will retransmit has improved communication efficiency.
3. realized that data retransmit and mend the function of biography frame by frame automatically.
Embodiment
The present invention will be further explained, explanation with infinite execution mode below.
A kind of safe across a network spacer assembly communication means comprises the steps:
1) detects file size,, enter step 3) if file less than 9KB, does not then need to split; If file more than or equal to 9KB, then needs to split, enter step 2);
2) file is split into some by the 9KB size, this is to realize easily;
3) with file or blocks of files packing framing, be about to file or step 2 in the step 1) less than 9KB) in blocks of files add frame head and postamble, form Frame;
4) network of setting up based on socket connects, and above-mentioned frame is sent to receiving terminal by frame number, if be sent completely then preserve frame; If send failure then repeating transmission immediately, send failure continuously and then return failure information 5 times;
5) receiving terminal receives and carries out following processing behind the frame data:
A) verification frame head postamble is if the verification failure then abandons this frame;
B) separate file piece content;
C) verification file piece content size;
D) with CR C algorithm verification file piece content;
E) after verification is finished,, then preserve blocks of files content and frame number if the blocks of files content is correct; If blocks of files content verification failure abandons this frame;
Whether when f) receiving last frame, it is complete to detect the frame of receiving before by frame number, if do not leak frame, then file receives successfully, feeds back successful information to transmitting terminal by the reverse isolation device simultaneously; If find to leak frame, then needs are mended the frame number that passes and feed back successful information to transmitting terminal by the reverse isolation device;
6) transmitting terminal is pressed following processing feedback information:
If a) feedback information is successfully, this frame of buffer memory discharged before transmitting terminal was then incited somebody to action, and whole process of transmitting is finished;
B) if feedback information is failure, and with frame number, transmitting terminal is then mended according to frame number and is passed frame;
C) after all frames all are sent completely,, then think to send the file failure if in feedback information is waited for 10 seconds time limits, do not receive feedback information.
Frame head comprises in the step 3):
Frame identification: fixed code+sign, wherein fixed code accounts for 4 byte spaces, and sign accounts for 1 byte space, and sign is used for marking whether to be start frame, end frame;
Frame number: the sequence number of frame is a numeral that increases progressively, and accounts for 4 byte spaces;
Blocks of files size: account for 2 byte spaces;
The compression sign: whether blocks of files is compressed, and accounts for 1 byte space;
Time-out time: after Frame sent, if also do not feed back successful information after exceeding this time, transmitting terminal was then retransmitted, and accounts for 4 byte spaces;
The verification of piece content: the blocks of files content adopts the CRC algorithm coding to become 4 bytes, is used for the verification of receiving terminal to the blocks of files content.
Claims (4)
1. the across a network spacer assembly communication means of a safety is characterized in that comprising the steps:
1) detects file size, if file less than 9KB, then enters step 3), if file more than or equal to 9KB, then enters step 2);
2) file splits into piece, and file is split into some by the 9KB size;
3) with file or blocks of files packing framing, be about to file or step 2 in the step 1) less than 9KB) in blocks of files add frame head and postamble, form Frame;
4) network of setting up based on socket connects, and above-mentioned frame is sent to receiving terminal by frame number, if be sent completely then preserve frame; If send failure then repeating transmission immediately, send failure continuously and then return failure information N time;
5) receiving terminal receives and carries out following processing behind the frame data:
A) verification frame head postamble is if the verification failure then abandons this frame;
B) separate file piece content;
C) verification file piece content size;
D) with CRC algorithm verification file piece content;
E) after verification is finished,, then preserve blocks of files content and frame number if the blocks of files content is correct; If blocks of files content verification failure abandons this frame;
Whether when f) receiving last frame, it is complete to detect the frame of receiving before by frame number, if do not leak frame, then file receives successfully, feeds back successful information to transmitting terminal by the reverse isolation device simultaneously; If find to leak frame, then needs are mended the frame number that passes and feed back successful information to transmitting terminal by the reverse isolation device;
6) transmitting terminal is pressed following processing feedback information:
If a) feedback information is successfully, this frame of buffer memory discharged before transmitting terminal was then incited somebody to action, and whole process of transmitting is finished;
B) if feedback information is failure, and with frame number, transmitting terminal is then mended according to frame number and is passed frame;
C) after all frames all are sent completely,, then think to send the file failure if in feedback information is waited for the time limit, do not receive feedback information.
2. safe across a network spacer assembly communication means according to claim 1, it is characterized in that: frame head comprises in the described step 3):
Frame identification: fixed code+sign, wherein fixed code accounts for 4 byte spaces, and sign accounts for 1 byte space, and sign is used for marking whether to be start frame, end frame;
Frame number: the sequence number of frame is a numeral that increases progressively, and accounts for 4 byte spaces;
Blocks of files size: account for 2 byte spaces;
The compression sign: whether blocks of files is compressed, and accounts for 1 byte space;
Time-out time: after Frame sent, if also do not feed back successful information after exceeding this time, transmitting terminal was then retransmitted, and accounts for 4 byte spaces;
The verification of piece content: the blocks of files content adopts the CRC algorithm coding to become 4 bytes, is used for the verification of receiving terminal to the blocks of files content.
3. safe across a network spacer assembly communication means according to claim 1 and 2 is characterized in that: described N=5.
4. safe across a network spacer assembly communication means according to claim 3 is characterized in that: described feedback information is limited to 10 seconds when waiting for.
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| CN2011101528603A CN102231658A (en) | 2011-06-09 | 2011-06-09 | Safe communication method of internetwork isolation apparatus |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354479A (en) * | 2013-03-22 | 2013-10-16 | 哈尔滨工业大学深圳研究生院 | LT code based spatial delay/disruption tolerant network (DTN) transmission method |
| CN103607258A (en) * | 2013-11-18 | 2014-02-26 | 深圳市道通科技有限公司 | Method, device and system for communication between primary device and secondary device in vehicle computer diagnosis device |
| CN104601299A (en) * | 2013-10-30 | 2015-05-06 | 北京临近空间飞行器系统工程研究所 | Data transmission system and method based on two-way acknowledgment |
| CN104917644A (en) * | 2015-04-14 | 2015-09-16 | 安徽立卓智能电网科技有限公司 | Method for actively and additionally recording data by sub stations to master station based on compression algorithm |
| CN104967497A (en) * | 2015-06-09 | 2015-10-07 | 武汉数字派特科技有限公司 | Network communication protocol-based reliable data transmission method and upgrading method |
| CN105375626A (en) * | 2015-11-03 | 2016-03-02 | 国网技术学院 | Distribution network integrated distribution automation terminal on-line monitoring system and method |
| CN105827465A (en) * | 2016-05-18 | 2016-08-03 | 罗文凤 | Method of power dispatching automatic control system |
| CN106254043A (en) * | 2016-08-26 | 2016-12-21 | 哈尔滨海能达科技有限公司 | Method, base station and the target terminal of a kind of data transmission |
| CN109743135A (en) * | 2018-12-29 | 2019-05-10 | 中国大唐集团新能源科学技术研究院有限公司 | A kind of method of breakpoint transmission file transmission |
| CN110266775A (en) * | 2019-06-04 | 2019-09-20 | 南京南瑞继保电气有限公司 | Document transmission method, device, computer equipment and storage medium |
| CN110839018A (en) * | 2019-10-22 | 2020-02-25 | 珠海许继芝电网自动化有限公司 | File transmission method and system based on power distribution automation |
| CN114079654A (en) * | 2022-01-05 | 2022-02-22 | 荣耀终端有限公司 | Data retransmission method, system and related device |
| CN114363320A (en) * | 2021-12-30 | 2022-04-15 | 格美安(北京)信息技术有限公司 | Cross-network data returning method, storage medium and system |
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Cited By (18)
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| CN103354479A (en) * | 2013-03-22 | 2013-10-16 | 哈尔滨工业大学深圳研究生院 | LT code based spatial delay/disruption tolerant network (DTN) transmission method |
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| CN103607258A (en) * | 2013-11-18 | 2014-02-26 | 深圳市道通科技有限公司 | Method, device and system for communication between primary device and secondary device in vehicle computer diagnosis device |
| CN104917644A (en) * | 2015-04-14 | 2015-09-16 | 安徽立卓智能电网科技有限公司 | Method for actively and additionally recording data by sub stations to master station based on compression algorithm |
| CN104967497A (en) * | 2015-06-09 | 2015-10-07 | 武汉数字派特科技有限公司 | Network communication protocol-based reliable data transmission method and upgrading method |
| CN105375626A (en) * | 2015-11-03 | 2016-03-02 | 国网技术学院 | Distribution network integrated distribution automation terminal on-line monitoring system and method |
| CN105827465A (en) * | 2016-05-18 | 2016-08-03 | 罗文凤 | Method of power dispatching automatic control system |
| CN105827465B (en) * | 2016-05-18 | 2019-04-26 | 广西东电联电力科技有限公司 | The method of power dispatching automation control system |
| CN106254043A (en) * | 2016-08-26 | 2016-12-21 | 哈尔滨海能达科技有限公司 | Method, base station and the target terminal of a kind of data transmission |
| CN109743135A (en) * | 2018-12-29 | 2019-05-10 | 中国大唐集团新能源科学技术研究院有限公司 | A kind of method of breakpoint transmission file transmission |
| CN110266775A (en) * | 2019-06-04 | 2019-09-20 | 南京南瑞继保电气有限公司 | Document transmission method, device, computer equipment and storage medium |
| CN110839018A (en) * | 2019-10-22 | 2020-02-25 | 珠海许继芝电网自动化有限公司 | File transmission method and system based on power distribution automation |
| CN114363320A (en) * | 2021-12-30 | 2022-04-15 | 格美安(北京)信息技术有限公司 | Cross-network data returning method, storage medium and system |
| CN114079654A (en) * | 2022-01-05 | 2022-02-22 | 荣耀终端有限公司 | Data retransmission method, system and related device |
| CN114079654B (en) * | 2022-01-05 | 2022-06-21 | 荣耀终端有限公司 | Data retransmission method, system and related device |
| CN115065984A (en) * | 2022-06-21 | 2022-09-16 | 江苏旭耀光电技术有限公司 | Stability test method and system for landscape lighting control system |
| CN115065984B (en) * | 2022-06-21 | 2024-05-17 | 江苏旭耀光电技术有限公司 | Stability test method and system for landscape lighting control system |
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Application publication date: 20111102 |