CN103139014A - Method and device for network quality evaluating based on by-pass - Google Patents
Method and device for network quality evaluating based on by-pass Download PDFInfo
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- CN103139014A CN103139014A CN2013100328914A CN201310032891A CN103139014A CN 103139014 A CN103139014 A CN 103139014A CN 2013100328914 A CN2013100328914 A CN 2013100328914A CN 201310032891 A CN201310032891 A CN 201310032891A CN 103139014 A CN103139014 A CN 103139014A
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Abstract
The invention discloses a method and a device for network quality evaluating based on a by-pass. The method include the steps of arranging a by-pass observing point between a first node and a second node in a network link, recording the time when an interactive data packet reaches the by-pass observing point while the first node and the second achieve data interaction, respectively acquiring a first network time delay from the first node to the by-pass observing point and a second network time delay from the second node to the by-pass observing point, obtaining a first retransmission rate on a route from the first node to the by-pass observing point and a second retransmission rate on a route from the second node to the by-pass observing point, and evaluating network quality according to the first network time delay, the second network time delay, the first retransmission rate and the second retransmission rate. The method and the device for the network quality evaluating based on the by-pass have the advantages of accurately evaluating the network quality, being capable of achieving accurate positioning for a network failure point, and increasing the accuracy of the network quality evaluating.
Description
Technical field
The present invention relates to technical field of the computer network, relate in particular to a kind of network quality evaluating method and device based on bypass.
Background technology
When the user is user's feedback network of network when of poor quality, the network maintenance staff comes the Sampling network quality with ping usually; Such as, to service end ping, check the time delay of server return data bag; Again to client ping, the time delay of viewing client-side return data bag; Thereby determine that network congestion occurs in service end or client.There is following defective in this detection method:
1. do not possess real-time; Because network congestion may be paroxysmal, when the network maintenance staff carries out network congestion and checks, might be above-mentioned congestedly pass by; Perhaps the dial user is rolled off the production line, can't be to the corresponding IP(Internet Protocol of this dial user of client, Internet protocol) address carries out ping.
2. can't reduce the real scene of network; Ping uses ICMP(Internet Control Messages Protocol, Internet Control Message Protocol) agreement, differ and react truly surely TCP(Transmission Control Protocol, transmission control protocol) the time delay situation of business, such as, whether the link of this TCP business generation time delay exists based on the route of using, or based on the QoS(Quality Of Service of agreement, service quality).
Summary of the invention
Main purpose of the present invention is to provide a kind of network quality evaluating method and device based on bypass, is intended to reach the purpose of accurate evaluation and test network quality.
The embodiment of the invention discloses a kind of network quality evaluating method based on bypass, comprise the following steps:
The bypass observation station is set between the first node in network link and Section Point;
When described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, and obtains respectively the second network time delay of described first node to the first network time delay of described bypass observation station and described bypass observation station to described Section Point; Simultaneously, obtain first retransmission rate and described bypass observation station second retransmission rate to described Section Point path of described first node to the described bypass observation station path;
According to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, the evaluation and test network quality.
Preferably, when described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, and obtains respectively the second network time delay of described first node to the first network time delay of described bypass observation station and described bypass observation station to described Section Point and comprise:
Record described first node to the time T 1 of the described bypass observation station of packet process of described Section Point transmission;
Record response data packet that described Section Point returns to described first node through the time T 2 of described bypass observation station;
When recording described first node described response data packet being sent to described Section Point, through the time T 3 of described bypass observation station;
According to T2, T3, calculate described first node and to the first network time delay t1 of described bypass observation station be: t1=(T3-T2)/2;
According to T1, T2, calculate described bypass observation station and to the second network time delay t2 of described Section Point be: t2=(T2-T1)/2.
Preferably, when described first node and Section Point carry out data interaction, obtain first retransmission rate and described bypass observation station to second retransmission rate described Section Point path on of described first node to the described bypass observation station path and comprise:
When described first node sends packet to described Section Point, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described Section Point, thereby obtain second retransmission rate of described bypass observation station to the described Section Point path;
When described Section Point sends packet to described first node, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described first node, thereby obtain first retransmission rate of described first node to the described bypass observation station path.
Preferably, described according to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, the evaluation and test network quality comprises:
If described first network time delay is greater than presetting network delay, perhaps described the first retransmission rate when presetting retransmission rate, is evaluated and tested described first node congested to the network side of described bypass observation station;
If described second network time delay is greater than the described network delay that presets, perhaps described the first retransmission rate when presetting retransmission rate, is evaluated and tested described bypass observation station congested to the network side of described Section Point greater than described.
Preferably, described according to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, the evaluation and test network quality comprises:
According to presetting rule, described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate are gathered;
Any of Yanzhong is when presetting network delay when described first network time delay and second network, and/or any in described the first retransmission rate and the second retransmission rate obtained the congestion point of network link between described first node and Section Point when presetting retransmission rate.
The embodiment of the invention also discloses a kind of network quality evaluating apparatus based on bypass, comprising:
Observation station arranges module, is used between the first node of network link and Section Point, the bypass observation station being set;
Parameter acquisition module, be used for when described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, and obtains respectively the second network time delay of described first node to the first network time delay of described bypass observation station and described bypass observation station to described Section Point; Simultaneously, obtain first retransmission rate and described bypass observation station second retransmission rate to described Section Point path of described first node to the described bypass observation station path;
The quality assessment module is used for according to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, the evaluation and test network quality.
Preferably, described parameter acquisition module also is used for:
Record described first node to the time T 1 of the described bypass observation station of packet process of described Section Point transmission;
Record response data packet that described Section Point returns to described first node through the time T 2 of described bypass observation station;
When recording described first node described response data packet being sent to described Section Point, through the time T 3 of described bypass observation station;
According to T2, T3, calculate described first node and to the first network time delay t1 of described bypass observation station be: t1=(T3-T2)/2;
According to T1, T2, calculate described bypass observation station and to the second network time delay t2 of described Section Point be: t2=(T2-T1)/2.
Preferably, described parameter acquisition module also is used for:
When described first node sends packet to described Section Point, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described Section Point, thereby obtain second retransmission rate of described bypass observation station to the described Section Point path;
When described Section Point sends packet to described first node, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described first node, thereby obtain first retransmission rate of described first node to the described bypass observation station path.
Preferably, described quality assessment module also is used for:
If described first network time delay is greater than presetting network delay, perhaps described the first retransmission rate when presetting retransmission rate, is evaluated and tested described first node congested to the network side of described bypass observation station;
If described second network time delay is greater than the described network delay that presets, perhaps described the first retransmission rate when presetting retransmission rate, is evaluated and tested described bypass observation station congested to the network side of described Section Point greater than described.
Preferably, described quality assessment module also is used for:
According to presetting rule, described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate are gathered;
Any of Yanzhong is when presetting network delay when described first network time delay and second network, and/or any in described the first retransmission rate and the second retransmission rate obtained the congestion point of network link between described first node and Section Point when presetting retransmission rate.
The present invention is by arranging the bypass observation station between the first node in network link and Section Point; When described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, obtain respectively described first node to first network time delay and first retransmission rate of described bypass observation station, and described bypass observation station is to second network time delay and second retransmission rate of described Section Point; According to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, the method of evaluation and test network quality, beneficial effect with accurate evaluation and test network quality, and can accurately locate the fault point of network, the accuracy of network quality evaluation and test improved.
Description of drawings
Fig. 1 is the network quality evaluating method application scenarios one example structure schematic diagram that the present invention is based on bypass;
Fig. 2 is the another example structure schematic diagram of network quality evaluating method application scenarios that the present invention is based on bypass;
Fig. 3 is the network quality evaluating method one embodiment schematic flow sheet that the present invention is based on bypass;
Fig. 4 the present invention is based in the network quality evaluating method of bypass, obtains the schematic diagram of bypass observation station and corresponding node network delay;
Fig. 5 the present invention is based in the network quality evaluating method of bypass, obtains the schematic diagram of bypass observation station and corresponding node data re-transmission rate;
Fig. 6 is the network quality evaluating apparatus one embodiment high-level schematic functional block diagram that the present invention is based on bypass.
The realization of the object of the invention, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
With reference to Fig. 1, Fig. 1 is the network quality evaluating method application scenarios one example structure schematic diagram that the present invention is based on bypass; Analytical equipment shown in Figure 1 can be utilized the network quality evaluating method that the present invention is based on bypass, access side and the Internet side are carried out the segmentation quality assessment, thereby can accurately learn it is that client access side network quality is bad, or the network quality of leading to the Internet side is poor.With reference to Fig. 2, Fig. 2 is the another example structure schematic diagram of network quality evaluating method application scenarios that the present invention is based on bypass; In application scenarios shown in Figure 2, analytical equipment is used the network quality evaluating method that the present invention is based on bypass, can accurately learn the concrete path that network congestion occurs; Such as, if add up according to visiting zone, find that customer end A and the customer end B network quality of egress router outer net side is poor, and client C and client D network are normal, infer that there is network congestion in visiting path, first city; If find that the network quality of the service end A of Intranet side of egress router and service end B is poor, and the quality of service end C and service end D is normal, infer that there is network congestion in the S2 place; If find that the network quality of service end A, service end B, service end C, service end D of the Intranet side of egress router is all bad, infer that there is network congestion in the S1 place.
Specific descriptions based on Fig. 1 and the described embodiment of Fig. 2 please refer to Fig. 3, and Fig. 3 is the network quality evaluating method one embodiment schematic flow sheet that the present invention is based on bypass; As shown in Figure 3, the network quality evaluating method that the present invention is based on bypass comprises the following steps:
Between step S01, the first node in network link and Section Point, the bypass observation station is set.
When network quality is evaluated and tested, can between any two nodes in network link, the bypass observation station be set; Such as, in application scenarios shown in Figure 1, the bypass observation station can be set between client and router, can router and service end between the bypass observation station is set, also can be simultaneously between client and router, between router and service end, the bypass observation station is set simultaneously; The present embodiment is to the concrete setting position of bypass observation station and number specifically is set does not do restriction, those skilled in the art will appreciate that in concrete network design, the bypass observation station can arbitrarily arrange according to actual needs.
Step S02, when described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, and obtains respectively the second network time delay of described first node to the first network time delay of described bypass observation station and described bypass observation station to described Section Point; Simultaneously, obtain first retransmission rate and described bypass observation station second retransmission rate to described Section Point path of described first node to the described bypass observation station path;
When described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, arrive the time of bypass observation station according to the packet of record, obtain respectively the second network time delay of described first node to the first network time delay of described bypass observation station and described bypass observation station to described Section Point.When first node and Section Point carry out data interaction, arrive the time of bypass observation station according to the interaction data bag of record, obtain first node to first network time delay, bypass observation station to the process of the second network time delay of Section Point of bypass observation station and be: record packet that described first node sends to described Section Point through the time T 1 of described bypass observation station; Record response data packet that described Section Point returns to described first node through the time T 2 of described bypass observation station; When recording described first node described response data packet being sent to described Section Point, through the time T 3 of described bypass observation station; According to T2, T3, calculate described first node and to the first network time delay t1 of described bypass observation station be: t1=(T3-T2)/2; According to T1, T2, calculate described bypass observation station and to the second network time delay t2 of described Section Point be: t2=(T2-T1)/2.
It will be appreciated by those skilled in the art that, on the statistic of network packet, TCP(Transmission Control Protocol, transmission control protocol) most ack(acknowledgement character, acknowledge character) reply bag, the main frame time delay that its service end self produces much smaller than network delay, can be ignored; Due to " wait of TCP overtime timer ", and the larger bag of service end time delay that produces can be eliminated by statistic sampling for small part.Simultaneously, there be not " wait of TCP overtime timer " in the TCP three-way handshake process, suitably increases the time delay proportion of the packet of TCP handshake procedure, reduces the time delay proportion of general data bag, makes network delay more accurate yet.
Take concrete application scenarios that a bypass observation station is set between client computer PC and service end as example, please refer to Fig. 4, Fig. 4 the present invention is based in the network quality evaluating method of bypass, obtains the schematic diagram of bypass observation station and corresponding node network delay; As shown in Figure 4, send to the packet of service end through the moment T1 of bypass observation station from PC, the time (ignoring the time delay that service end self produces) that the response data packet ack that responds to service end consumes through the moment T2 of bypass observation station again, be exactly that the bypass observation station is to the round A consuming time of the distance of service end, can obtain serving distolateral propagation delay time t1, i.e. t1=(T2-T1 divided by 2)/2=A/2.Because the time delay that service end self produces is compared with network delay, the time is very short, can ignore, and generally, the response data packet ack that service end produces is instant reply.Similarly, can calculate PC to the network of the bypass observation station PC of being side consuming time propagation delay time t2, i.e. t2=(T3-T2)/2=B/2.
When described first node and Section Point carry out data interaction, obtain first retransmission rate and described bypass observation station second retransmission rate to described Section Point path of described first node to the described bypass observation station path.The process of obtaining the first retransmission rate and the second retransmission rate comprises: when described first node sends packet to described Section Point, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described Section Point, thereby obtain second retransmission rate of described bypass observation station to the described Section Point path; When described Section Point sends packet to described first node, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described first node, thereby obtain first retransmission rate of described first node to the described bypass observation station path.
Take concrete application scenarios that a bypass observation station is set between client and service end as example, please refer to Fig. 5, Fig. 5 the present invention is based in the network quality evaluating method of bypass, obtains the schematic diagram of bypass observation station and corresponding node data re-transmission rate; As shown in Figure 5, when client sends packet to service end, can get the bypass observation station to the data packet retransmission rate of service end in the bypass observation station, because can see in the bypass observation station packet that all observation stations are lost to the path of service end, i.e. the packet of original transmission and the retransmission packet that resends can be observed and obtain.But do not observe the packet that client is lost to the bypass observation station, because this section lost data packets, the bypass observation station can only be seen the packet after re-transmission, can't accurately judge whether re-transmission occured.Same reason, can by observe service end issue client-side to packet, obtain the packet of original transmission and the retransmission packet that resends, thereby can obtain the retransmission rate of client to the bypass observation station path.
Step S03, according to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, the evaluation and test network quality.
According to the network of relation evaluation and test parameter of obtaining, can evaluate and test the network quality between any two nodes on network transmission link.
Such as, if described first network time delay is greater than presetting network delay, perhaps described the first retransmission rate when presetting retransmission rate, is evaluated and tested described first node congested to the network side of described bypass observation station; If described second network time delay is greater than the described network delay that presets, perhaps described the first retransmission rate when presetting retransmission rate, is evaluated and tested described bypass observation station to congested, the as illustrated in figs. 1 and 2 embodiment of network side of described Section Point greater than described.
Such as, based on the described embodiment of Fig. 1, as shown in the table by the network quality evaluation and test parameter that above-mentioned steps S01 and step S02 get:
Suppose that in concrete application scenarios shown in Figure 1, presetting retransmission rate is 4%, presetting network delay is 60ms; Can draw at a glance from above-mentioned network quality parameters, when accessing the data of www.*.com, mainly larger at the Internet side time delay, the Internet side network quality is bad, and the network instruction that the user accesses side is very good.
In a preferred embodiment, can gather according to the segmented network quality information of certain rule with each node or each connection, such as according to IP section or user geographical position, each network delay and the retransmission rate of correspondence are gathered, thereby the network bottleneck point that exists in the evaluation and test network link is the network congestion point.
Such as, in a certain concrete network application environment, the network quality evaluation and test parameter that gets is as shown in the table:
Suppose that in this concrete network application environment, presetting retransmission rate is 4%, presetting network delay is 60ms; Can draw at a glance the network quality situation of each branch from above-mentioned network quality parameters.As above shown in the table, do in Zhengzhou, do in Guangzhou and the client network of test center is second-rate, and the network maintenance staff can according to above-mentioned concrete network evaluation parameter, carry out network operation pointedly.
The present embodiment is by arranging the bypass observation station between the first node in network link and Section Point; When described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, obtain respectively described first node to first network time delay and first retransmission rate of described bypass observation station, and described bypass observation station is to second network time delay and second retransmission rate of described Section Point; According to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, the method of evaluation and test network quality, beneficial effect with accurate evaluation and test network quality, and can accurately locate the fault point of network, the accuracy of network quality evaluation and test improved.
With reference to Fig. 6, Fig. 6 is the network quality evaluating apparatus one embodiment high-level schematic functional block diagram that the present invention is based on bypass.The present invention is based on the network quality evaluating apparatus of bypass in concrete application scenarios illustrated in figures 1 and 2, can be used as the part of analytical equipment, be arranged in analytical equipment.As shown in Figure 6, the network quality evaluating apparatus that the present invention is based on bypass comprises: observation station arranges module 01, parameter acquisition module 02 and quality assessment module 03.
Observation station arranges module 01, is used between the first node of network link and Section Point, the bypass observation station being set;
When network quality was evaluated and tested, observation station arranges module 01 can arrange the bypass observation station between any two nodes in network link; Such as, in application scenarios shown in Figure 1, observation station arranges module 01 can arrange the bypass observation station between client and router, can router and service end between the bypass observation station is set, also can be simultaneously between client and router, between router and service end, the bypass observation station is set simultaneously; The present embodiment is to the concrete setting position of bypass observation station and number specifically is set does not do restriction, those skilled in the art will appreciate that in concrete network design, the bypass observation station can arbitrarily arrange according to actual needs.
Parameter acquisition module 02, be used for when described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, and obtains respectively the second network time delay of described first node to the first network time delay of described bypass observation station and described bypass observation station to described Section Point; Simultaneously, obtain first retransmission rate and described bypass observation station second retransmission rate to described Section Point path of described first node to the described bypass observation station path.
When described first node and Section Point carry out data interaction, the packet of parameter acquisition module 02 recording interactive arrives the time of described bypass observation station, arrive the time of bypass observation station according to the packet of record, obtain respectively the second network time delay of described first node to the first network time delay of described bypass observation station and described bypass observation station to described Section Point.
When first node and Section Point carry out data interaction, arrive the time of bypass observation station according to the interaction data bag of record, parameter acquisition module 02 is obtained first node to first network time delay, bypass observation station to the process of the second network time delay of Section Point of bypass observation station and is: record packet that described first node sends to described Section Point through the time T 1 of described bypass observation station; Record response data packet that described Section Point returns to described first node through the time T 2 of described bypass observation station; When recording described first node described response data packet being sent to described Section Point, through the time T 3 of described bypass observation station; According to T2, T3, calculate described first node and to the first network time delay t1 of described bypass observation station be: t1=(T3-T2)/2; According to T1, T2, calculate described bypass observation station and to the second network time delay t2 of described Section Point be: t2=(T2-T1)/2.
It will be appreciated by those skilled in the art that, on the statistic of network packet, TCP(Transmission Control Protocol, transmission control protocol) most ack(acknowledgement character, acknowledge character) reply bag, the main frame time delay that its service end self produces much smaller than network delay, can be ignored; Due to " wait of TCP overtime timer ", and the larger bag of service end time delay that produces can be eliminated by statistic sampling for small part.Simultaneously, there be not " wait of TCP overtime timer " in the TCP three-way handshake process, suitably increases the time delay proportion of the packet of TCP handshake procedure, reduces the time delay proportion of general data bag, makes network delay more accurate yet.
When described first node and Section Point carried out data interaction, parameter acquisition module 02 was obtained first retransmission rate and described bypass observation station second retransmission rate to described Section Point path of described first node to the described bypass observation station path.
The process that parameter acquisition module 02 is obtained the first retransmission rate and the second retransmission rate comprises: when described first node sends packet to described Section Point, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described Section Point, thereby obtain second retransmission rate of described bypass observation station to the described Section Point path; When described Section Point sends packet to described first node, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described first node, thereby obtain first retransmission rate of described first node to the described bypass observation station path.
Please refer to the specific descriptions of Fig. 4 and the described embodiment of Fig. 5 about the concrete scene of above-mentioned network quality evaluation and test parameter acquiring, do not repeat them here.
Such as, if described first network time delay is greater than presetting network delay, perhaps described the first retransmission rate is when presetting retransmission rate, the quality assessment module 03 described first node of evaluation and test is congested to the network side of described bypass observation station; If described second network time delay is greater than the described network delay that presets, perhaps described the first retransmission rate is greater than described when presetting retransmission rate, the quality assessment module 03 described bypass observation station of evaluation and test is to congested, the as illustrated in figs. 1 and 2 embodiment of network side of described Section Point.
In a preferred embodiment, quality assessment module 03 can gather according to the segmented network quality information of certain rule with each node or each connection, such as according to IP section or user geographical position, each network delay and the retransmission rate of correspondence are gathered, thereby the network bottleneck point that exists in the evaluation and test network link is the network congestion point.
The present embodiment is by arranging the bypass observation station between the first node in network link and Section Point; When described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, obtain respectively described first node to first network time delay and first retransmission rate of described bypass observation station, and described bypass observation station is to second network time delay and second retransmission rate of described Section Point; According to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, the evaluation and test network quality, beneficial effect with accurate evaluation and test network quality, and can accurately locate the fault point of network, the accuracy of network quality evaluation and test improved.
The above is only the preferred embodiments of the present invention; not thereby limit its scope of the claims; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (10)
1. the network quality evaluating method based on bypass, is characterized in that, comprises the following steps:
The bypass observation station is set between the first node in network link and Section Point;
When described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, and obtains respectively the second network time delay of described first node to the first network time delay of described bypass observation station and described bypass observation station to described Section Point; Simultaneously, obtain first retransmission rate and described bypass observation station second retransmission rate to described Section Point path of described first node to the described bypass observation station path;
According to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, the evaluation and test network quality.
2. the method for claim 1, it is characterized in that, when described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, and obtains respectively the second network time delay of described first node to the first network time delay of described bypass observation station and described bypass observation station to described Section Point and comprise:
Record described first node to the time T 1 of the described bypass observation station of packet process of described Section Point transmission;
Record response data packet that described Section Point returns to described first node through the time T 2 of described bypass observation station;
When recording described first node described response data packet being sent to described Section Point, through the time T 3 of described bypass observation station;
According to T2, T3, calculate described first node and to the first network time delay t1 of described bypass observation station be: t1=(T3-T2)/2;
According to T1, T2, calculate described bypass observation station and to the second network time delay t2 of described Section Point be: t2=(T2-T1)/2.
3. the method for claim 1, it is characterized in that, when described first node and Section Point carry out data interaction, obtain first retransmission rate and described bypass observation station to second retransmission rate described Section Point path on of described first node to the described bypass observation station path and comprise:
When described first node sends packet to described Section Point, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described Section Point, thereby obtain second retransmission rate of described bypass observation station to the described Section Point path;
When described Section Point sends packet to described first node, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described first node, thereby obtain first retransmission rate of described first node to the described bypass observation station path.
4. the method for claim 1, is characterized in that, and is described according to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, and the evaluation and test network quality comprises:
If described first network time delay is greater than presetting network delay, perhaps described the first retransmission rate when presetting retransmission rate, is evaluated and tested described first node congested to the network side of described bypass observation station;
If described second network time delay is greater than the described network delay that presets, perhaps described the first retransmission rate when presetting retransmission rate, is evaluated and tested described bypass observation station congested to the network side of described Section Point greater than described.
5. method as described in claim 1 or 4, is characterized in that, and is described according to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, and the evaluation and test network quality comprises:
According to presetting rule, described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate are gathered;
Any of Yanzhong is when presetting network delay when described first network time delay and second network, and/or any in described the first retransmission rate and the second retransmission rate obtained the congestion point of network link between described first node and Section Point when presetting retransmission rate.
6. the network quality evaluating apparatus based on bypass, is characterized in that, comprising:
Observation station arranges module, is used between the first node of network link and Section Point, the bypass observation station being set;
Parameter acquisition module, be used for when described first node and Section Point carry out data interaction, the packet of recording interactive arrives the time of described bypass observation station, and obtains respectively the second network time delay of described first node to the first network time delay of described bypass observation station and described bypass observation station to described Section Point; Simultaneously, obtain first retransmission rate and described bypass observation station second retransmission rate to described Section Point path of described first node to the described bypass observation station path;
The quality assessment module is used for according to described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate, the evaluation and test network quality.
7. device as claimed in claim 6, is characterized in that, described parameter acquisition module also is used for:
Record described first node to the time T 1 of the described bypass observation station of packet process of described Section Point transmission;
Record response data packet that described Section Point returns to described first node through the time T 2 of described bypass observation station;
When recording described first node described response data packet being sent to described Section Point, through the time T 3 of described bypass observation station;
According to T2, T3, calculate described first node and to the first network time delay t1 of described bypass observation station be: t1=(T3-T2)/2;
According to T1, T2, calculate described bypass observation station and to the second network time delay t2 of described Section Point be: t2=(T2-T1)/2.
8. device as described in claim 6 or 7, is characterized in that, described parameter acquisition module also is used for:
When described first node sends packet to described Section Point, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described Section Point, thereby obtain second retransmission rate of described bypass observation station to the described Section Point path;
When described Section Point sends packet to described first node, obtain described bypass observation station and send the quantity of packet and the quantity of the transmission of data bag again to described first node, thereby obtain first retransmission rate of described first node to the described bypass observation station path.
9. device as claimed in claim 6, is characterized in that, described quality assessment module also is used for:
If described first network time delay is greater than presetting network delay, perhaps described the first retransmission rate when presetting retransmission rate, is evaluated and tested described first node congested to the network side of described bypass observation station;
If described second network time delay is greater than the described network delay that presets, perhaps described the first retransmission rate when presetting retransmission rate, is evaluated and tested described bypass observation station congested to the network side of described Section Point greater than described.
10. device as described in claim 6 or 9, is characterized in that, described quality assessment module also is used for:
According to presetting rule, described first network time delay, second network time delay, the first retransmission rate and the second retransmission rate are gathered;
Any of Yanzhong is when presetting network delay when described first network time delay and second network, and/or any in described the first retransmission rate and the second retransmission rate obtained the congestion point of network link between described first node and Section Point when presetting retransmission rate.
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