CN102891779B - Large-scale network performance measuring system and method for IP network - Google Patents
Large-scale network performance measuring system and method for IP network Download PDFInfo
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Abstract
The invention relates to a measuring method of a large-scale network performance measuring system for an IP network. The large-scale network performance measuring system consists of a server and a plurality of network probes, wherein the server consists of a server and a client side and is positioned in a core network, the plurality of network probes are positioned in a measured network, the server is a computer or server which has a massive network data processing capability and is used for generating a measuring task, interacting with the network probes, issuing the measuring task and acquiring measuring results as well as collecting and presenting the measuring results uploaded by the network probes; and the network probes are embedded equipment or computers which are distributed in a clustering manner and are used for receiving and executing the measuring tasks of the server, mainly executing active network measurement and reporting the measuring results. The large-scale network performance measuring system has the capabilities of submitting the measuring results through NAT (Network Address Translation) and acquiring the next measuring task; and the large-scale network performance measuring system has a little influence on the firewall strategy. Besides, the large-scale network performance measuring system has strong real-time property of measuring data, assurance of service quality, large measurement range, capability of realizing measurement among networks, flexible and variable measurement topology, large system capacity, large expandability and favorable popularization prospect.
Description
Technical field
The present invention relates to a kind of method of measurement of large scale network performance measurement system, exactly, the method of measurement that relates to a kind of large scale network performance measurement system of initiatively measuring for IP network, be used for solving existing IP network, the measuring range of the inter-network network measure producing because of fire compartment wall and network address translation NAT is little, measure the multiple shortcoming that topology is single, real-time is poor and autgmentability is poor, belongs to the technical field of data communication.
Background technology
Since the Internet is born, the measuring technique of network performance also produces thereupon.Over more than 40 years, people ceaselessly study how to measure network performance and the various new methods of measuring network, to adapt to the Internet in fast-developing and expansion.Produce in the meantime all very good network performance measurement systems of many structural designs and performance, and in network tuning, in networking and planning, all produced far-reaching influence.
The object of network research, is to set up efficient stable, the network that safety is controlled.Network performance measurement is the most effectual way that obtains every real-time factor parameter in network.Then, based on measurement result, build model, measurement data is analyzed, be conducive to people and deeply understand network, the development of prediction network, solves network potential problems.Thus, network measure is the runnability of Collection and analysis procotol, the numerical value that help people obtain network property indices parameter and then the effective means of investigating network problem.
Network performance measurement comprises following three key elements:
Measuring object: comprise network node, link or application etc., the various performances of measured node, link or Internet Transmission: the propagation delay time, throughput, the packet loss that comprise link, the router efficiency of router, time delay, packet loss, the answering delay of Web server, throughput, power system capacity and maximum stable link number etc.
Measurement environment: comprise the type on the determining of the choosing of measurement point, Measuring Time, network probe and communication link road etc.
Method of measurement: for each network of network performance index, all will carry out following operation: first choose suitable method of measurement, this method of measurement at least should meet robustness: the dynamic change of tested network, can not make method of measurement lose efficacy; Secondly, should meet repeatability: same network condition, repeatedly measurement result should be consistent; Again, should meet accuracy: measurement result should be able to reflect the truth of network.
Due to the difference of internet and conventional telecommunications net, the communication quality of packet switching can constantly change in communication process.Therefore,, for internet, network performance measurement has prior meaning.Rise the nineties in 20th century, and many mechanisms begin one's study and design the measuring system of internet performance.Nineteen ninety-five U.S. NSFC (NSF) has carried out fairly large systematic survey to Internet traffic at that time.At the beginning of 1996, U.S. application network research National Laboratory (NLANR) has held relevant internet statistics and the seminar ISMA analyzing.After this, the internet data analysis cooperative association (CAIDA) that relies on Univ California-San Diego USA's supercomputing center has carried out systematic research to the correlation theory of network measure and method.IETF has also set up the operational factor that task force IPPM formulates network.The paper < < An Architecture for Large-scale Internet Measurement > > that doctor V.Paxson in 1997 delivers has become the classical documents in network performance measurement field.
According to the statistics of CAIDA, the U.S. has 21 (wherein disclosed 15, private 6) about open, the private performance measurement measuring system of internet.China also has many universities and scientific research institution to participate.The large-scale internet performance measurement model (LIPM) of Tsing-Hua University, the internet performance measuring system (NAPM) of Xi'an Communications University has proposed the concept of application probe and region probe.The customizable network measure base frame (CNMI) of BJ University of Aeronautics & Astronautics is the advantage of utilizing Java platform, makes system be easy to exploitation and dispose.The distributed network measurement architecture (DNMAI) that Xian Electronics Science and Technology University proposes, and developed Embedded measured node.In addition, also has Japanese MAWI, the PPNCG measure the item in Europe etc.
But prior art exists following problem:
(1) configuration is complicated, and because existing system mostly is research system, its main user is scientific research personnel, and the measuring equipment of its use is more special, and place network need to be adjusted mostly specially, not easy to operate.
(2) cannot passing through NAT gateway, measure topological structure restricted.Because existing method of measurement is not yet considered the effect of NAT gateway, current mechanism cannot be crossed NAT gateway and be carried out efficient communication.Make to measure Intranet and become very difficult.
(3) high cost, is difficult to commercialization.Due to existing measuring system mainly based on server as measuring equipment, make high cost.Reality is promoted more difficult or scale and is subject to cost restriction and cannot forms large scale measurement.
Summary of the invention
In view of this, the method of measurement that the object of this invention is to provide a kind of large scale network performance measurement system for IP network, the present invention adopts new measuring system framework and communication mechanism thereof, the interior measurement with across a network of net that makes network performance measurement system can complete large scale network measured, and has good real-time and extensibility.
In order to achieve the above object, the invention provides a kind of method of measurement of the large scale network performance measurement system for IP network, described system is to be comprised of with a plurality of network probes that are positioned at tested network the server that is arranged in core net that is server and client framework; Wherein:
Server, by computer or the server with mass network data-handling capacity, formed, for generating measurement task, and carry out interactive communication with network probe, sending measuring task and obtain measurement result, and the measurement result that network probe is uploaded gathers and presents;
Network probe, by have network measure ability, and embedded device or the computer that can communicate by letter and be distributed type assemblies with server interaction form, for receiving and carry out the measurement task from server, and measurement result is reported to server; The network measure that this network probe is carried out, completed be take active network measurements as main: by send data, observation status transmission, required time and result in network, judge network state;
It is characterized in that: described method comprises following operating procedure:
Step 1, the initial registration of network probe: network probe is arranged at after tested network, to server registration; In this step 1, network probe is carried out following content of operation:
(11) first according to the flag bit in nonvolatile storage, judge whether that this network probe stored the IP address of configuration, if so, carry out subsequent step (12); Otherwise, redirect execution step (13);
(12), according to the IP address arranging in nonvolatile storage, the network interface configuration function that calls network protocol stack arranges IP parameter, after accomplishing the setting up, and redirect execution step (16);
(13) judge in IP network and whether arrange and carry out the server that DynamicHost is set protocol DHCP, if had, carry out subsequent step (14); Otherwise, redirect execution step (15):
(14), according to the standard of DHCP, automatically perform the operation of IP address configuration; And in carrying out configuration operation process, any one step is carried out unsuccessfully, just proceed to and carry out subsequent step (15); Only complete after configuration operation redirect execution step (16);
(15) user to adopt human configuration mode be network probe configuration of IP address: comprise and open a Webpage and user configures alternately, or user adds in the identical subnet in the IP address of network probe acquiescence, accesses this webpage and be network probe configuration of IP address, or user is network probe configuration of IP address by debugging interface and serial ports; Complete after the human configuration of IP address, carry out subsequent step (16);
(16) to server, submit log-on message to, and judge whether to succeed in registration according to feedback information; If registration failure, notifies user's registration failure, and return to execution step (11), re-register; If succeed in registration, preserve IP address configuration information, in order to next time, carry out self-configuration while restarting;
Step 2, network probe is carried out network measure: network probe and server cycle interactive communication, obtain measurement task, carry out active network measurements operation, then measurement result is sent to server; This step 2 comprises following content of operation:
(21) network probe obtains behind the IP address of server to dns server inquiry, initiates TCP and connects, so that both sides connect to server;
(22) connect after foundation, network probe is contained in last measurement result in HTTP packet, then sends to server; Described measurement result data are used data exchange language JSON to format, and are placed in HTTP POST message load;
(23) server receives after the test result of network probe, takes out the measurement task in next cycle from database in the task queue of this network probe, after re-using JSON it being formatd, is placed in HTTP returned packet, sends to network probe;
(24) network probe receives after the message of measurement task, resolution data from JSON form, and the task queue of restoring, and finish this TCP connection;
(25) network probe carries out active network measurements operation according to the measurement task receiving; Until after reaching the cycle time arranging, return to execution step (22), network probe is communicated by letter with server interaction, and this measurement result is contained in HTTP packet, sends to server; Then start new measuring period.
The present invention has following advantage:
(1) be subject to NAT and fire compartment wall to affect very little: because system of the present invention adopts the communication strategy of periodically initiating connection request from subnet to core net, therefore, can submit measurement result to through NAT, and obtain the task of next time measuring.And, because connection is initiated to low priority network by high-priority network, also very little on the impact of firewall policy.
(2) real-time, service quality QoS is guaranteed: the message that sends and return is standard compliant network service message specification (as http protocol etc.) all, make router be easy to realize its QoS and guarantee, improved communication quality, promoted the real-time of measurement data.
(3) measuring range is large, can inter-network measure, and measures topology flexible and changeable: because network probe is distributed in each subnet, can measure the network performance between different sub-network.Therefore, the network measure mode of system of the present invention is very flexible, has broken away from the restriction of the measurement topology of star in the past.
(4) power system capacity is large, and extensibility is good: while using large-scale network probe, can use a plurality of servers to carry out load balancing, improve the capacity of system.
Accompanying drawing explanation
Fig. 1 is that the present invention is for the large scale network performance measurement system structure composition schematic diagram of IP network.
Fig. 2 is the method for measurement operating procedure flow chart of large scale network performance measurement system of the present invention.
Fig. 3 is the network probe initial registration stage flow chart in method of measurement of the present invention.
Fig. 4 is network probe in method of measurement of the present invention and the periodic communication process of server
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention is a kind of large scale network performance measurement system for IP network, and its design original intention is to make it have larger measuring range, better extensibility, and better real-time.
Referring to Fig. 1, the structure of introducing system of the present invention forms, and is provided with two kinds of parts: the server that is arranged in core net and a plurality of network probes that are positioned at tested network that are server and client framework.In system when operation,, produced measurement task and be issued to each network probe by server, then completing actual network measure by network probe, and feed back to server and carry out aggregation process.Wherein,
Server is computer or the server with mass network data-handling capacity, be used for generating measurement task, and carry out interactive communication with network probe, sending measuring task and obtain measurement result, and the measurement result that network probe is uploaded gathers and presents; Be provided with: Subscriber Interface Module SIM, task scheduling modules, communication module and four parts of database; The function of all parts is:
Subscriber Interface Module SIM is responsible for using WEB page mode via communication module and user interactions: obtain user's measurement demand, and be converted into active data form and deposit database in; When user inquires about measurement result, the measurement result of having inquired about from database, presents to user with data or graph mode.
Task scheduling modules is responsible for user's measurement demand to be converted to a plurality of measurement tasks, and according to the measurement task load situation of each network probe, dynamically to adjust mode to network probe sending measuring task; From database takes out measurement task, it is carried out real-time dynamic order and forms measurement task sequence, and deposit in respectively in the task queue of each network probe, wait for while communicating by letter with network probe, via communication module, send to the other side.
Communication module is provided with user interface and network probe interface, is responsible for and user and network probe interactive communication respectively.User interface wherein has two effects: receive user's measurement request, and be converted into burst or periodically measure task, then be stored in database; And when user access server, measurement result is presented to user by data or graph mode, and to user, transmit measurement data according to user's inquiry.Network probe interface is responsible for the interactive communication between network probe: from task scheduling modules, take out after the measurement task encapsulation of this network probe, send to this network probe; Meanwhile, the measurement result of automatic network probe carries out, after data processing, depositing in database in the future.HTML (Hypertext Markup Language) HTTP (Hypertext Transfer Protocol) is used in communication now, with QoS and the convenient flexible configuration fire compartment wall of guaranteeing service quality: in measuring process, by network probe, regularly initiating transmission control protocol TCP (Transmission Control Protocol) connects, by domain name mode connection server, make this system can pass through the network address translation NAT of gateway (Network Address Translation), carry out maximum across a network measurement.And because adopting domain name access mode, make server to realize load balancing at domain name system DNS (Domain Name System) layer, and the IP address that guarantees server can be realized and being switched and migration.The packet load that network probe is used HTTP POST mode that measurement task and measurement result are put into small-sized data encapsulation format sends to server; By server, to network probe, returned to again the packet of http response, in order to avoid occur that the phenomenon of low memory appears in built-in network probe.
Database is responsible for arranging a plurality of tables of data, be respectively used to store the much information that comprises user, network probe, measurement task and measurement result that derives from each corresponding module, and measurement task is offered to task scheduling modules dispatch and distribute, and the measurement result submitted to of received communication module.
Network probe by have network measure ability, and embedded device or the computer that can communicate by letter and be distributed type assemblies with server interaction form, for receiving and carry out the measurement task from server, and measurement result is reported to server.The network measure that this network probe is carried out, completed be take active network measurements as main: by send data, observation status transmission, required time and result in network, judge network state.Be provided with communication module, task scheduling modules and three parts of test module, all parts function is as follows:
Communication module is responsible for and server cycle interactive communication, obtain after the measurement task of server, by its unloading in the task queue of task scheduling modules; Meanwhile, receive the measurement result that test module is beamed back, and be stored in interim buffer area, so that during next time with server communication, reported server.
Task scheduling modules be responsible for according to task priority to measurement task dispatch with distribute after, give test module and carry out network measure.
Test module is responsible for receiving the measurement task from task scheduling modules, and the control of the scheduler module that receives an assignment, and initiatively carries out network measure; Described measurement task definition comprises delay (PING) and the route (TRACEROUTE) of measuring between network node, the analysis result of domain name (being DNS inquiry).
The main body of the network performance measurement of system of the present invention is the network probe that is distributed type assemblies, and its effect mainly contains two: adopted before this specific communication mechanism and server communication, and obtained measurement task, and measurement result is returned to server; Then being to carry out network measure, is mainly active network measurements, by send data in network, observe status transmission and result, and required time judges the state of network.
Referring to Fig. 2, introduce the operating procedure of large scale network performance measurement system method of measurement of the present invention:
Step 1, the initial registration of network probe: network probe is arranged at after tested network, to server registration (referring to Fig. 3).In this step 1, network probe is carried out following content of operation:
(11) first according to the flag bit in nonvolatile storage, judge whether that this network probe stored the IP address of configuration, if so, carry out subsequent step (12); Otherwise, redirect execution step (13).
(12), according to the IP address arranging in nonvolatile storage, the network interface configuration function that calls network protocol stack arranges IP parameter, after accomplishing the setting up, and redirect execution step (16).
(13) judge in IP network and whether arrange and carry out the server that DynamicHost is set protocol DHCP (Dynamic Host Configuration Protocol), if had, carry out subsequent step (14); Otherwise, redirect execution step (15).
(14), according to the standard of DHCP, automatically perform the operation of IP address configuration; And in carrying out configuration operation process, any one step is carried out unsuccessfully, just proceed to and carry out subsequent step (15); Only complete after configuration operation redirect execution step (16).
(15) user to adopt human configuration mode be network probe configuration of IP address: comprise and open a Webpage and user configures alternately, or user adds in the identical subnet in the IP address of network probe acquiescence, accesses this webpage and be network probe configuration of IP address, or user is network probe configuration of IP address by debugging interface and serial ports; Complete after the human configuration of IP address, carry out subsequent step (16).
(16) to server, submit log-on message to, and judge whether to succeed in registration according to feedback information; If registration failure, notifies user's registration failure, and return to execution step (11), re-register; If succeed in registration, preserve IP address configuration information, in order to next time, carry out self-configuration while restarting.This step comprises following content of operation:
(16A) TCP connection is initiated and set up to network probe to server;
(16B) network probe will comprise that separately No. ID, the log-on message of network configuration are packaged in TCP bag, then send to server; Server receives after the log-on message bag of network probe, according to its ID, database is retrieved, if find that this network probe is unregistered, opens up new list item, completes registration operation; If find that this network probe once registered in the past, upgrade its information, complete registration process;
(16C) server returns to the TCP bag that comprises the information of succeeding in registration to network probe, if this network probe also has its measurement task that need to complete, this communication TCP wraps also to comprise and measures for the first time task list;
(16D) network probe receives after the return information of server, finishes registration process.
Step 2, network probe is carried out network measure: network probe and server cycle interactive communication, obtain measurement task, then carry out active network measurements operation, then measurement result is sent to server.
This step 2 comprises following content of operation:
(21) network probe obtains behind the IP address of server to dns server inquiry, initiates TCP and connects, so that both sides connect to server.
(22) connect after foundation, network probe is contained in last measurement result in HTTP packet, then sends to server; Described measurement result data are used data exchange language JSON (Javascript Object Notation) to format, and are placed in HTTP POST message load.
(23) server receives after the test result of network probe, takes out the measurement task in next cycle from database in the task queue of this network probe, after re-using JSON it being formatd, is placed in HTTP returned packet, sends to network probe.
(24) network probe receives after the message of measurement task, resolution data from JSON form, and the task queue of restoring, and finish this TCP connection.
(25) network probe carries out active network measurements operation according to the measurement task receiving; Until after reaching the cycle time arranging, return to execution step (22), network probe is communicated by letter with server interaction, and this measurement result is contained in HTTP packet, sends to server; Then start new measuring period.Now, the active network measurements that network probe is carried out comprises following content of operation:
(25A) network probe is used the echo request of Internet Control Message Protocol ICMP (Internet Control Message Protocol)/reply (Echo Request/Reply) function and timer, the target of certain IP address is carried out to the measurement of round trip transmission delay, obtain time delay (PING) numerical value between network node;
(25B) network probe is used echo request/answering of ICMP, and time-to-live TTL (the Time To Live) field that at every turn increases progressively setting in IP packet is measured the route that arrives target.
Because ttl field is every, through a router, subtract 1, when the TTL numerical value in the IP packet that arrives at a certain router returns 0, this router can send to the transmission address of packet the ICMP bag that comprises TTL time-out error, for network probe, from the wrong designation data bag returning, parse the address of the router that this TTL numerical value is corresponding, and the jumping figure that arrives this router, obtain the list of IP address of router sequence between destination address and network probe.
(25C) network probe, according to the analysis result of the dns server address of automatic acquisition and dns server, compares the domain name mapping situation of each network, obtains the measurement result of domain name mapping in heterogeneous networks.
Referring to Fig. 4, introduce the periodic communication process of network probe and server in this step:
(31) network probe is inquired about to dns server, obtains behind the IP address of server, and the TCP that initiates 80 ports to server connects.
(32), after connecting, network probe is included in last measurement result in HTTP packet and sends to server.Wherein data are used JSON form and are placed in the load of HTTP POST message.
(33) server receives after the test result of network probe, takes out the measurement task in next cycle from database in the task queue of this network probe, after using JSON to format it, is placed in HTTP returned packet, sends to network probe.
(34) network probe receives after the message of measurement task, will from JSON form, parse measurement task and data, deposits in after task queue, finishes this TCP and connects.
(35) network probe carries out network measure operation according to the measurement task receiving.
(36) arrive the cycle time arranging, again start the operation of execution step (31), carry out interactive communication with server.
The present invention has carried out repeatedly implementing test, and test situation is implemented in brief description emulation now:
By a Linux server, as server, and be positioned in public network, open its TCP/80 port is as the serve port of network probe.Adopt a plurality of embedded devices or computer as the network probe of this system, be positioned in each private network, these networks are all connected with public network, between network, may have NAT and fire compartment wall.
At Linux server deploy Apache Web Server as communication module, for replying the request of network probe.And add PHP module as Subscriber Interface Module SIM.Use MySQL as database.
Built-in network probe is deployed in objective network, it has network interface and ARM controller, and disposed Embedded Protocol Stack module as basis, developed network communication module thereon, task scheduling modules and the test module with active network measurements function.
While implementing test run, maintain a plurality of measurement task queues and measurement result queue.By timer, trigger the periodical communication with server, before both communications, network probe first forms the HTTP bag of standard, after measurement result is taken out from queue, be placed on again in the load of packet, by embedded TCP/IP stack and server, set up TCP and be connected, then to server, send the HTTP bag generating.Server is received after this bag, new measurement task is encapsulated as to HTTP bag and returns to network probe.Network probe receives after the bag that contains measurement task, and resolution data also deposits measurement queue in.Then disconnecting this TCP connects.
Before upper once timer expiry, network probe is carried out measurement task.
Enforcement test of the present invention is successfully, has realized goal of the invention.
Claims (3)
1. for a method of measurement for the large scale network performance measurement system of IP network, described system is to be comprised of with a plurality of network probes that are positioned at tested network the server that is arranged in core net that is server and client framework; Wherein:
Server, by computer or the server with mass network data-handling capacity, formed, for generating measurement task, and carry out interactive communication with network probe, sending measuring task and obtain measurement result, and the measurement result that network probe is uploaded gathers and presents;
Network probe, by have network measure ability, and embedded device or the computer that can communicate by letter and be distributed type assemblies with server interaction form, for receiving and carry out the measurement task from server, and measurement result is reported to server; The network measure that this network probe is carried out, completed be take active network measurements as main: by send data, observation status transmission, required time and result in network, judge network state;
It is characterized in that: described method comprises following operating procedure:
Step 1, the initial registration of network probe: network probe is arranged at after tested network, to server registration; In this step 1, network probe is carried out following content of operation:
(11) first according to the flag bit in nonvolatile storage, judge whether that this network probe stored the IP address of configuration, if so, carry out subsequent step (12); Otherwise, redirect execution step (13);
(12), according to the IP address arranging in nonvolatile storage, the network interface configuration function that calls network protocol stack arranges IP parameter, after accomplishing the setting up, and redirect execution step (16);
(13) judge in IP network and whether arrange and carry out the server that DynamicHost is set protocol DHCP, if had, carry out subsequent step (14); Otherwise, redirect execution step (15):
(14), according to the standard of DHCP, automatically perform the operation of IP address configuration; And in carrying out configuration operation process, any one step is carried out unsuccessfully, just proceed to and carry out subsequent step (15); Only complete after configuration operation redirect execution step (16);
(15) user to adopt human configuration mode be network probe configuration of IP address: comprise and open a Webpage and user configures alternately, or user adds in the identical subnet in the IP address of network probe acquiescence, accesses this webpage and be network probe configuration of IP address, or user is network probe configuration of IP address by debugging interface and serial ports; Complete after the human configuration of IP address, carry out subsequent step (16);
(16) to server, submit log-on message to, and judge whether to succeed in registration according to feedback information; If registration failure, notifies user's registration failure, and return to execution step (11), re-register; If succeed in registration, preserve IP address configuration information, in order to next time, carry out self-configuration while restarting
Step 2, network probe is carried out network measure: network probe and server cycle interactive communication, obtain measurement task, carry out active network measurements operation, then measurement result is sent to server; This step 2 comprises following content of operation:
(21) network probe obtains behind the IP address of server to dns server inquiry, initiates TCP and connects, so that both sides connect to server;
(22) connect after foundation, network probe is contained in last measurement result in HTTP packet, then sends to server; Described measurement result data are used data exchange language JSON to format, and are placed in HTTP POST message load;
(23) server receives after the test result of network probe, takes out the measurement task in next cycle from database in the task queue of this network probe, after re-using JSON it being formatd, is placed in HTTP returned packet, sends to network probe;
(24) network probe receives after the message of measurement task, resolution data from JSON form, and the task queue of restoring, and finish this TCP connection;
(25) network probe carries out active network measurements operation according to the measurement task receiving; Until after reaching the cycle time arranging, return to execution step (22), network probe is communicated by letter with server interaction, and this measurement result is contained in HTTP packet, sends to server; Then start new measuring period.
2. method of measurement according to claim 1, is characterized in that: described step (16) comprises following content of operation:
(16A) TCP connection is initiated and set up to network probe to server;
(16B) network probe will comprise that separately No. ID, the log-on message of network configuration are packaged in TCP bag, then send to server; Server receives after the log-on message bag of network probe, according to its ID, database is retrieved, if find that this network probe is unregistered, opens up new list item, completes registration operation; If find that this network probe once registered in the past, upgrade its information, complete registration process;
(16C) server returns to the TCP bag that comprises the information of succeeding in registration to network probe, if this network probe also has its measurement task that need to complete, this communication TCP wraps also to comprise and measures for the first time task list;
(16D) network probe receives after the return information of server, finishes registration process.
3. method of measurement according to claim 1, is characterized in that: in described step (25), the active network measurements that network probe is carried out comprises following content of operation:
(25A) use echo request/answering and the timer of Internet Control Message Protocol ICMP, the target of certain IP address is carried out to the measurement of round trip transmission delay, obtain the time delay numerical value between network node;
(25B) use echo request/answering of ICMP, and time-to-live TTL (the Time To Live) field that at every turn increases progressively setting in IP packet is measured the route that arrives target; Because ttl field is every, through a router, subtract 1, when the TTL numerical value in the IP packet that arrives at a certain router returns 0, this router can send to the transmission address of packet the ICMP bag that comprises TTL time-out error, for network probe, from the mistake indication bag returning, parse the address of the router that this TTL numerical value is corresponding, and the jumping figure that arrives router, obtain the list of the IP address of router sequence between target and network probe;
(25C) according to the dns server address of automatic acquisition, and the analysis result of dns server, the domain name mapping situation of each network relatively, obtains the measurement result of domain name mapping in heterogeneous networks.
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| CN103337003A (en) * | 2013-05-07 | 2013-10-02 | 山西太钢不锈钢股份有限公司 | Centralized scheduling method based on distributed terminal |
| CN104899092B (en) * | 2014-03-03 | 2019-08-20 | 上海携程商务有限公司 | JOB distribution system and method |
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