CN1964247A - A method and device to simulate network damage - Google Patents
A method and device to simulate network damage Download PDFInfo
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- CN1964247A CN1964247A CN 200610161079 CN200610161079A CN1964247A CN 1964247 A CN1964247 A CN 1964247A CN 200610161079 CN200610161079 CN 200610161079 CN 200610161079 A CN200610161079 A CN 200610161079A CN 1964247 A CN1964247 A CN 1964247A
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Abstract
To overcome defects in prior art, the provided simulation method for network damage comprises: generating configuration table contained abnormal simulation information; generating abnormal data package according to abnormal simulation information to calculate the sending time and thereby send abnormal data package. This invention is simple and convenient, reduces cost and testing period greatly, and can construct abnormal simulation with high precision for wide quantitative testing.
Description
Technical field
The present invention relates to the network test field, particularly a kind of method and apparatus of analog network damage.
Background technology
Up to the present, Ethernet remains most active technology in the computer interconnection field, based on the ethernet technology of packet network, relies on characteristics such as price advantage, versatility, popularized apace, and in expansion service field gradually.Continuous development along with the Internet, bandwidth between some traditional network equipments (as router) can not meet the demands, need higher more efficient interconnection technique to connect the backbone that these network equipments constitute the Internet, the 1000M Ethernet has become first-selected technology.The user inserts metropolitan area network by ethernet technology, realizes online, and file is downloaded, business such as video request program, special line, private network, and having become becomes more and more popular.
Nearest VoIP (the Voice over Internet Protocol that occurs, voice transfer based on Internet protocol), RTP (Real-timeTransport Protocol, RTP), CESop (Circuit Emulation Services over Packet-switchednetwork, circuit simulation based on packet network), ToP (Timing over Packet-switched network, packet network passes clock) technology such as transmission, the realization live signal transmits information by packet network.
The transmission of live signal becomes the new business based on PSN (Packet-Switched Network, bag packet switching network) network, and still, frame losing and delay may take place in network packet; And since the route difference of process, PDV (Packet Delay Variation, packet delay shake) and out of order may appear in and the inherent delay of the network equipment; Sending the packet loss of a period of time also can appear or repeat in the routing switch that takes place when the intermediate stations fault in addition, and the purpose website may be received various wrong bags.Exactly because these networks are unusual, may cause the serious deterioration of quality of the live signal of required transmission, even cause service disconnection.
Referring to Fig. 1, prior art one is in order to test the performance of certain equipment, to utilize existing instrument to simulate small-sized network environment in the laboratory and test.Compare sending signal and received signal for convenience, draw test datas such as time-delay, shake, error code, the source takes place in signalization and reception sources is same instrument, i.e. signal generation tester among the figure.Produce packet (as video flowing) and send to Devices to test one by signal generation tester, after receiving, Devices to test one converts thereof into the Ethernet data bag, and transmit by a plurality of hubs and router, arrive Devices to test two at last, after Devices to test two is received the Ethernet data bag, convert thereof into the packet (being video flowing) of unprocessed form, return to signal generation tester then, after signal generation tester is received the packet that Devices to test two sends, the packet that itself and primary signal is promptly sent to Devices to test one compares, thereby the signal quality of test Devices to test one and Devices to test two promptly detects the sending function of Devices to test one and the receiving function of Devices to test two.Make wrong bag by the circuit scrambling, or utilize the intrinsic delay of the network equipment, manufacturing delay and faint test environments such as delay jitter.
The shortcoming of prior art one is as follows:
Because lack the interference of external factor, test result is not enough to react truth, if adopt the mode of circuit scrambling to generate wrong bag, then have randomness, wayward.Because the quantity of equipment and the restriction of the length that is connected holding wire, the test effect is very limited, can't simulate comparatively complicated real network environment, can not accurately control error type and degree.
Referring to Fig. 2, be the signal quality of prior art two testing equipment in real network.Test environment can be actual packet network, based on the Ethernet (Ethernet over Synchronous Digital Hierarchy is based on the Ethernet of SDH (Synchronous Digital Hierarchy)) of SDH or hybrid network or the like.Signal generation tester one at first sends a primary signal (as video streaming data packet) and gives Devices to test one, after receiving, Devices to test one converts thereof into the Ethernet data bag, forward by multiple media then, as pass through wireless channel, satellite channel, WAN (Wide area network, wide area network), ATM (AsynchronousTransfer Mode, asynchronous transfer mode) or based on the transmission signals such as Ethernet of SDH, arrive Devices to test two at last, Devices to test two converts thereof into the packet of unprocessed form after receiving the Ethernet data bag, and is transmitted to signal generation tester two; Signal generation tester one also can send to signal generation tester two with primary signal by other safe modes in addition, thereby guarantee that signal generation tester two can compare primary signal and the signal of receiving, verify the live signal quality and the anti-interference situation of Devices to test one and Devices to test two, can obtain quite real actual test data.
The shortcoming of prior art two is as follows:
Owing to limit by the routing function of packet network, transmitting terminal and receiving terminal must be set in different places, the path by long just can obtain desirable test environment, otherwise can't be by predetermined backbone network, and test result does not have reference value.And strange land or transnational test expense costliness often, cost is high.Test environment build also more complicated, the replacing of different test vectors often needs the significant movement of test environment, influences testing efficiency.The cycle of test is long, and since network unusual can not the property estimated, can't control the characteristic of live network, have only by long follow-on test, just can obtain more complete test report.In addition when occurring not expecting situation in the test process, because the complexity of network not only is difficult to trace also extremely difficult the reproduction.
Summary of the invention
Can not to simulate complicated real network environment or problems such as testing expense height, cycle length in the prior art in order solving, to the invention provides a kind of method of analog network damage, specifically may further comprise the steps:
Steps A: generate the allocation list that is used for the recording exceptional analog information;
Step B: when receiving normal data packet,, generate the abnormal data bag, and calculate the transmitting time of described abnormal data bag according to described unusual analog information;
Step C: send described abnormal data bag according to described transmitting time.
The present invention also provides a kind of device of analog network damage, and described device comprises:
Configuration module is used to generate and is used for the allocation list of recording exceptional analog information;
The unusual module that adds is used for when receiving normal data packet, according to described unusual analog information, generates the abnormal data bag, and calculates the transmitting time of described abnormal data bag;
Sending module is used for sending described abnormal data bag according to the transmitting time that described unusual adding module calculates.
Beneficial effect of the present invention mainly shows:
1, can finish the simulation of true network environment by the separate unit instrument, not only just can build configurable variety of network environments easily, and greatly reduce testing cost, shorten test period significantly in the laboratory.
2, by the simple transformation allocation list, can construct polytype unusually, finish various tests; Because allocation list can be changed at any time, make the complete may command of test, can get involved; And be convenient to analyzing and positioning, can realize the reproduction of simple problem.
3, by Exception Type and time of delay in the change allocation list, can amplify unusually arbitrarily, realize the test of network tolerance limit network.For example, in live network, maximum packet delay can reach 1 second, and the present invention can make packet delay reach 10 seconds or higher.
4, accurate structural anomaly, and finely tune, can obtain accurate analysis report, can realize targetedly, on purpose Devices to test be carried out various qualitative, quantitatives tests.
Description of drawings
Fig. 1 is prior art one simulating network test structure figure;
Fig. 2 is prior art two real network test structure figure;
Fig. 3 is the application schematic diagram of network harm analog instrument of the present invention;
Fig. 4 is the method embodiment flow chart of analog network damage of the present invention;
Fig. 5 is that frame memory data mode of the present invention is provided with schematic diagram;
Fig. 6 is the device example structure figure of analog network damage of the present invention;
Fig. 7 is the device operation principle schematic diagram of analog network damage of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
The present invention is based on logical circuit, can be realized by programmable logic device or microprocessor, can batch making be ASIC (Application Specific Integrated Circuit application-specific IC) or commercial chip also.Use the present invention and can make special test equipment, realize multiple test by the separate unit instrument, as shown in Figure 3.
The present invention separates the network of packet network abstract unusually, obtains following five kinds of basic unusual types: packet loss, delay, wrong bag, repeating transmission and out of order.Various can the combination substantially unusually by these five kinds unusually in the real network draw.By the simple transformation allocation list, can construct polytype unusual, for example, packet loss and postpone unusual, wrong bag and postpone unusual, packet loss and out of order, wrong bag and out of order or the like.
Embodiment one
Referring to Fig. 4, the invention provides a kind of method of analog network damage, specifically may further comprise the steps:
Step 101: at first generate the allocation list that is used for the recording exceptional analog information, and it is kept in the allocation list memory.
The user can generate allocation list by software, also can generate by the statistics or the mathematical formulae (for example normal distribution, background noise etc.) of other instruments.Allocation list provides the configuration data of simulation package switching network, in the table each normal data packet all there is a definite configuration item (i.e. record), this configuration item has write down unusual analog information, it has determined the content changing of corresponding packet, time-delay to change, retransmit characteristic and abandon situation or the like, each packet is carried out the control of transmitting time and transmission content, thereby realize the purpose of network harm simulation.The length of each record is 16bit (bit), and content comprises the Exception Type and the time of delay that will add in the normal data packet, and is as shown in table 1.
| Exception Type | Time of delay |
| 4bit | 12bit |
Table 1
The type of packet has following 8 kinds in the present embodiment:
0000: normal bag;
0001: packet loss;
The wrong bag of 0010:CRC;
0011: the destination address mistake;
0100: the source address mistake;
0101: the payload mistake;
1000: retransmit;
1001: ultra-long time is retransmitted.
For destination address mistake, source address mistake or payload type of error, abnormity processing is that the content of normal data packet is made into mistake.
According to the value in the allocation list, can be with the original normal data packet of receiving, be treated to and comprise above-mentioned various unusual packet.Every record can directly dispose the time of delay of back 12bit for a packet, generates to postpone to add and delay jitter.The concrete length of allocation list should be mated the integral multiple of the degree of depth or the degree of depth of allocation list memory.
Produce conflict for avoiding simultaneously the memory in the circuit being read and write, also dynamic replacing and the continuous configuration of configuration datas in a large number in order to realize allocation list, further, can adopt 2 block storages as the allocation list memory, one is read states, and the memory that promptly is being read can not carry out write operation; Another piece is for writing state, promptly can only be used for writing data.After write operation was finished, state switched, and former readable memory is converted to the state of writing only, and the former memory of writing only is converted to a readable state.Two block storages can not be read states simultaneously, or simultaneously for writing state.This function of utilizing two block storages to read and write switching can also realize that super large or infinitely great allocation list dispose continuously.
Step 102: when receiving normal packet,, in normal packet, add unusually, generate the abnormal data bag according to the Exception Type of this packet correspondence in the allocation list; And the abnormal data bag stored in the frame memory, the write operation of abnormal data bag writes by the order of address.If this abnormal data bag is the packet of retransmitting or overlength is retransmitted, then will be repeated to write.
Because the normal data packet that receives may be random length, so the length of the abnormal data bag that generates also has nothing in common with each other.Whether finish in order to identify the abnormal data bag, further, can add sign at the bag tail.For example, the width of a packet is 8bit, then uses the wide memory of 9bit, and last 1bit as sign, when being designated 1, is shown that this packet finishes, and when being designated 0, shows that this packet does not finish.
Step 103:, calculate the transmitting time of the abnormal data bag of generation according to the time of delay of this normal data packet correspondence in the allocation list; And the initial address and the transmitting time of abnormal data bag stored in address and the time memory.
In order to improve the accuracy of data, further, can carry out record to the state of abnormal data bag, writing down it under storage abnormal data bag situation is effective status, it is disarmed state reading under the concurrent condition of giving a present of abnormal data bag record, the step below promptly increasing:
Step 104: respectively connect in the both sides of frame memory a digital ratio extra wide, with the same dark memory of frame memory, one as SIG_I (writing sign), another piece all is made as 0 as SIG_O (read-out mark) during initialization.When writing the abnormal data bag to frame memory, bit corresponding among the SIG_I is got non-, when from frame memory, reading the abnormal data bag, get bit corresponding among the SIG_O non-.When sending the abnormal data bag, earlier the sign of both sides is carried out the XOR value, if the result is 1, then this abnormal data is surrounded by effect; If the result is 0, then this abnormal data bag is invalid.Referring to Fig. 5, grey be recorded as effective record, promptly write and be not read out, white be invalid record, promptly be not written into or be read out (because same packet does not allow to be repeated transmission, so think that the packet that has sent is an invalid packets).
Step 105: chaining search address and time memory, when current time of transmitting time conformance with standard clock, take out initial address.Present embodiment provides the standard time clock of analog network, and for the ease of test, the maximum time of reference data packet delay, generally the width with the standard time clock value is made as 24bit or 32bit or above (greater than 16bit).
Because the time of search address and time memory has determined the transmitting time and the actual error that sends the time of abnormal data bag that calculate, in order to improve precision, further, can be divided into a plurality of zones to address and time memory, carry out parallel search, shorten the time of inquiry, improve time precision.For example, if address and time memory are the 4k address spaces, one time of taking turns of retrieval is 4k * clock cycle.The 4k address space is divided into 4, and every is 1k, and 4 zones are retrieved simultaneously, and then only use takes 1k * clock cycle.Suppose that search address and time memory need the time of 1ms, then the error of the time of delayed delivery and retransmission data bag scope for receiving within 1ms.
Step 106: from frame memory, read the abnormal data bag according to the initial address that obtains,, then send this abnormal data bag, and bit corresponding among the SIG_O is got non-, make this record inefficacy if this abnormal data is surrounded by effect.
Embodiment two
Referring to Fig. 6 and Fig. 7, the present invention also provides a kind of device of analog network damage, comprising:
1) configuration module is used to generate and is used for the allocation list of recording exceptional analog information;
2) add module unusually, be used for when receiving normal data packet,, generate the abnormal data bag, and calculate the transmitting time of abnormal data bag according to the unusual analog information in the allocation list;
3) sending module, the transmitting time that is used for calculating according to unusual adding module sends the abnormal data bag.
Corresponding each normal data packet all has the record of a relevant abnormalities analog information in the allocation list, and unusual analog information generally includes Exception Type and time of delay etc.; The unusual module that adds is according to the Exception Type of normal data packet correspondence with generate the abnormal data bag time of delay; The transmitting time of the abnormal data bag that generates adds by current time of standard time clock and calculates time of delay.
Above-mentioned configuration module also comprises:
The allocation list memory is used for the allocation list that the stored configuration module generates, and the allocation list memory comprises two memories, and at any one time, one of them is a read states, and another is for writing state; After writing allocation list to the memory that is in the state of writing, transfer the state of this memory to read states, correspondingly, transfer the state of another memory to writing state.
Above-mentioned unusual adding module also comprises:
Frame memory is used to store the abnormal data bag that unusual adding module generates;
Address and time memory are used to store the initial address of the abnormal data bag that unusual adding module generates and add the transmitting time that module calculates unusually.
Above-mentioned sending module specifically is used to start the transmitting time searcher to address and time memory chaining search, when retrieving the transmitting time of conformance with standard clock current time, read corresponding initial address, from frame memory, read abnormal data bag and transmission according to initial address then.
The device of above-mentioned analog network damage also comprises:
The state recording module is used for after unusual adding module generates the abnormal data bag, and the state of recording exceptional data bag is an effective status; After sending module sent the abnormal data bag, the state that writes down this abnormal data bag was a disarmed state.
Above-described embodiment, the present invention embodiment several more preferably just, the common variation that those skilled in the art carries out in the technical solution of the present invention scope and replacing all should be included in protection scope of the present invention.
Claims (11)
1. the method for analog network damage is characterized in that described method comprises:
Steps A: generate the allocation list that is used for the recording exceptional analog information;
Step B: when receiving normal data packet,, generate the abnormal data bag, and calculate the transmitting time of described abnormal data bag according to described unusual analog information;
Step C: send described abnormal data bag according to described transmitting time.
2. the method for analog network according to claim 1 damage is characterized in that, described comprise unusually packet loss, delay, wrong bag, repeating transmission and out of order in one or more.
3. the method for analog network damage according to claim 1 is characterized in that described unusual analog information comprises Exception Type and time of delay.
4. the method for analog network according to claim 1 damage is characterized in that, described steps A also comprises described allocation list is stored in step in the allocation list memory; Described allocation list memory comprises two memories, and at any one time, one of them is a read states, and another is for writing state; After writing allocation list to the memory that is in the state of writing, transfer the state of this memory to read states, correspondingly, transfer the state of another memory to writing state.
5. the method for analog network according to claim 1 damage is characterized in that, described step B also is included in and generates behind the abnormal data bag record it is the step of effective status; Described step C also is included in and sends after the described abnormal data bag, writes down it and is the step of disarmed state.
6. the method for analog network damage according to claim 1 is characterized in that described step B also comprises:
Described abnormal data bag is stored in the frame memory, and the initial address and the transmitting time of described abnormal data bag stored in address and the time memory;
Described step C is specially:
Described address of chaining search and time memory when retrieving the initial address of current time of transmitting time conformance with standard clock, are read the abnormal data bag and are sent according to described initial address from described frame memory.
7. the method for analog network damage according to claim 6 is characterized in that, described address and time memory is divided into the polylith memory block, described being retrieved as retrieving simultaneously all memory blocks.
8. the device of analog network damage is characterized in that described device comprises:
Configuration module is used to generate and is used for the allocation list of recording exceptional analog information;
The unusual module that adds is used for when receiving normal data packet, according to described unusual analog information, generates the abnormal data bag, and calculates the transmitting time of described abnormal data bag;
Sending module is used for sending described abnormal data bag according to the transmitting time that described unusual adding module calculates.
9. the device of analog network damage according to claim 8 is characterized in that described configuration module also comprises:
The allocation list memory is used to store described allocation list, and described allocation list memory comprises two memories, and at any one time, one of them is a read states, and another is for writing state; After writing allocation list to the memory that is in the state of writing, transfer the state of this memory to read states, correspondingly, transfer the state of another memory to writing state.
10. the device of analog network damage according to claim 8 is characterized in that described unusual adding module also comprises:
Frame memory is used to store described abnormal data bag;
Address and time memory, the initial address and the transmitting time that are used to store described abnormal data bag.
Described sending module specifically is used for described address of chaining search and time memory, when retrieving the initial address of current time of transmitting time conformance with standard clock, reads the abnormal data bag and send from described frame memory according to described initial address.
11. the device of analog network damage according to claim 8 is characterized in that described device also comprises:
The state recording module is used for after described unusual adding module generates the abnormal data bag, and the state that writes down described abnormal data bag is an effective status; After described sending module sent described abnormal data bag, the state that writes down this abnormal data bag was a disarmed state.
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| CN2006101610791A CN1964247B (en) | 2006-12-04 | 2006-12-04 | A method and device to simulate network damage |
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| CN102769513A (en) * | 2012-07-20 | 2012-11-07 | 中国电子科技集团公司第四十一研究所 | Method for realizing Ethernet data frame time delay damage |
| CN103609160A (en) * | 2011-05-31 | 2014-02-26 | 阿尔卡特朗讯公司 | Message flow rerouting for autonomous self-disrupting network element |
| CN104767655A (en) * | 2015-03-17 | 2015-07-08 | 微梦创科网络科技（中国）有限公司 | Analog result detection method and device |
| CN104918042A (en) * | 2015-06-09 | 2015-09-16 | 国网四川省电力公司电力科学研究院 | Video signal network damage simulation device, system and method |
| CN105119740A (en) * | 2015-07-16 | 2015-12-02 | 中国电子科技集团公司第四十一研究所 | IP network damage simulation method and IP network damage simulation instrument |
| CN106301994A (en) * | 2015-06-24 | 2017-01-04 | 北京京东尚科信息技术有限公司 | A kind of network service abnormality test method and apparatus |
| CN110912735A (en) * | 2019-11-13 | 2020-03-24 | 中国联合网络通信集团有限公司 | Simulation method and device for data packet transmission network |
| CN114640596A (en) * | 2020-12-16 | 2022-06-17 | 慧盾信息安全科技(北京)有限公司 | System and method for automatically simulating network damage of all interactive messages between two entities |
| CN114826942A (en) * | 2022-06-27 | 2022-07-29 | 江苏信而泰智能装备有限公司 | Random damage method and system for network packet |
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| US6970481B2 (en) * | 2001-04-17 | 2005-11-29 | Microsoft Corporation | Methods and systems for distributing multimedia data over heterogeneous networks |
| JP2004201121A (en) * | 2002-12-19 | 2004-07-15 | Ntt Docomo Inc | Protocol testing system and protocol testing method |
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- 2006-12-04 CN CN2006101610791A patent/CN1964247B/en not_active Expired - Fee Related
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| CN103609160A (en) * | 2011-05-31 | 2014-02-26 | 阿尔卡特朗讯公司 | Message flow rerouting for autonomous self-disrupting network element |
| CN102769513B (en) * | 2012-07-20 | 2015-12-16 | 中国电子科技集团公司第四十一研究所 | Ethernet data frame time delay damage implementation method |
| CN102769513A (en) * | 2012-07-20 | 2012-11-07 | 中国电子科技集团公司第四十一研究所 | Method for realizing Ethernet data frame time delay damage |
| CN104767655A (en) * | 2015-03-17 | 2015-07-08 | 微梦创科网络科技（中国）有限公司 | Analog result detection method and device |
| CN104767655B (en) * | 2015-03-17 | 2018-09-21 | 微梦创科网络科技（中国）有限公司 | A kind of analog result detection method and device |
| CN104918042B (en) * | 2015-06-09 | 2017-09-29 | 国网四川省电力公司电力科学研究院 | A kind of vision signal network harm analogue means, system and method |
| CN104918042A (en) * | 2015-06-09 | 2015-09-16 | 国网四川省电力公司电力科学研究院 | Video signal network damage simulation device, system and method |
| CN106301994A (en) * | 2015-06-24 | 2017-01-04 | 北京京东尚科信息技术有限公司 | A kind of network service abnormality test method and apparatus |
| CN106301994B (en) * | 2015-06-24 | 2023-11-03 | 北京京东尚科信息技术有限公司 | Network communication abnormity testing method and device |
| CN105119740A (en) * | 2015-07-16 | 2015-12-02 | 中国电子科技集团公司第四十一研究所 | IP network damage simulation method and IP network damage simulation instrument |
| CN105119740B (en) * | 2015-07-16 | 2018-10-02 | 中国电子科技集团公司第四十一研究所 | A kind of IP network damage simulation method and emulating instrument |
| CN110912735A (en) * | 2019-11-13 | 2020-03-24 | 中国联合网络通信集团有限公司 | Simulation method and device for data packet transmission network |
| CN114640596A (en) * | 2020-12-16 | 2022-06-17 | 慧盾信息安全科技(北京)有限公司 | System and method for automatically simulating network damage of all interactive messages between two entities |
| CN114640596B (en) * | 2020-12-16 | 2024-02-06 | 慧盾信息安全科技(北京)有限公司 | System and method for realizing automatic network damage simulation of all interactive messages between two entities |
| CN114826942A (en) * | 2022-06-27 | 2022-07-29 | 江苏信而泰智能装备有限公司 | Random damage method and system for network packet |
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| CN1964247B (en) | 2010-08-25 |
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