WO2018061121A1

WO2018061121A1 - Device for analyzing acceleration effect brought about by communication acceleration device

Info

Publication number: WO2018061121A1
Application number: PCT/JP2016/078698
Authority: WO
Inventors: 悠樹宮崎; 尚久脊古; 賢二仲
Original assignee: 株式会社日立製作所
Priority date: 2016-09-28
Filing date: 2016-09-28
Publication date: 2018-04-05

Abstract

Provided is a device for analyzing an acceleration effect brought about by a communication acceleration device that performs, in a first network, a process for accelerating communication between the first network and a second network, said device comprising: memory in which a program is stored; and a processor that is operated in accordance with the program, wherein the processor receives from a user an analysis request in which a session is specified, acquires monitor information in an acceleration process performed with respect to the session by the communication acceleration device, analyzes the monitor information, deduces a cause for inadequacy of the effect of the acceleration process performed with respect to the session, and presents the deduced cause to the user.

Description

Device that analyzes the speed-up effect of a communication speed-up device

The present invention relates to an analysis of speed-up effect by a communication speed-up device.

There is a WAN acceleration device that speeds up communication on a WAN line by optimizing WAN (Wide Area Network) communication. However, the WAN speed-up device cannot always achieve the communication speed-up effect, and the speed-up effect by the WAN speed-up device may not appear depending on the communication environment and communication contents.

For example, Japanese Unexamined Patent Application Publication No. 2016-1000072 discloses an analysis device that analyzes a packet processed by a communication device connected to a network. The analysis device is configured to receive the mirror packet of the packet flowing through the network, and to acquire and analyze the partial information of the mirror packet, and based on the analysis result, the packet for the packet transferred through the network And an analysis unit that determines the necessity of application of the function of the communication device ”(summary).

Japanese Patent Laying-Open No. 2016-1000072 further states, “Based on at least one of a communication delay and a packet discard rate in each of the plurality of communications, it is determined whether or not the network acceleration function needs to be applied to each of the plurality of communications” (claims) ).

Japanese Patent Laid-Open No. 2016-100721

Japanese Unexamined Patent Application Publication No. 2016-1000072 can improve the resource utilization efficiency of the communication device by determining the necessity of applying the communication function based on the communication analysis. However, if a (sufficient) speed-up effect does not appear in communication that the user wants to speed up, the reason why the speed-up effect does not appear remains unclear, and it is also unclear how the speed-up effect appears. It remains.

If the communication speed-up effect does not appear, the customer or front system engineer can respond by referring to the manual, and if that does not solve the problem, for example, it may be possible to request the developer to solve the problem. However, in order to solve the problem, a lot of human resources are required for analyzing the communication state and the system. Therefore, there is a demand for a technique that can efficiently identify a factor that does not exhibit a communication speed-up effect.

A typical example is a device for analyzing the speed-up effect of a communication speed-up device that performs processing for speeding up communication in the first network between a first network and a second network, A processor that operates in accordance with the program, the processor receiving a request for analysis specifying a session from a user, and obtaining monitor information in the acceleration processing for the session by the communication acceleration device Then, the monitor information is analyzed, a factor for which the effect of the speed-up process for the session is insufficient is estimated, and the estimated factor is presented to the user.

According to one aspect of the present invention, it is possible to efficiently identify a factor that does not exhibit a communication speed-up effect.

An example of a communication system configuration is shown. An example of the configuration of a WAN acceleration device is shown. 2 shows an example of a logical configuration of a WAN acceleration device. An example of a setting table is shown. The example of the table of one session contained in a session management table is shown. The flowchart of the process example of a WAN acceleration control part is shown. The flowchart of the example of a session analysis process by the WAN acceleration analysis part is shown. The flowchart of the example of a session analysis process by the WAN acceleration analysis part is shown. The flowchart of the example of a session analysis process by the WAN acceleration analysis part is shown. The example of the analysis result shown to a user from a user interface part is shown.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that this embodiment is merely an example for realizing the present invention, and does not limit the technical scope of the present invention. In each figure, the same reference numerals are given to common configurations.

The analysis device according to the present embodiment analyzes a factor that does not show a (sufficient) speed-up effect in a communication system in which the communication speed-up device is mounted, and notifies the user of the estimated factor. As a result, the primary factor analysis by the user is made more efficient, and quick response for problem solving becomes possible. The analysis device may support the user's response by outputting a countermeasure policy together with a factor of an insufficient speed-up effect. The user is a user of the analysis device.

The analysis device analyzes the communication session and searches for the cause when the speed-up effect does not appear in the session. In the example described below, a session in TCP communication is analyzed, but the method of this embodiment is applicable to protocols other than TCP. Further, the method of the present embodiment can be applied to the analysis of the speed-up effect in a network different from WAN (Wide Area Network).

Session analysis may target multiple layers of information. As a result, it is possible to more accurately estimate the factor that the speed-up effect cannot be obtained. For example, in addition to transport layer information such as RTT (Round Trip Time) and packet loss rate, the system also provides information on WAN and LAN (Local Area Network) congestion in the physical layer and bandwidth control at the application layer at the end terminal. Analyzing this information, search for factors that do not show the speed-up effect.

The system refers to the setting of the transmission / reception buffer usage rate and specific acceleration function, in addition to the RTT and loss rate, from the statistical information by the WAN acceleration device and its state as information for analyzing the session.

FIG. 1 shows a communication system configuration example of the present embodiment. A WAN acceleration device 102, which is a communication acceleration device, is mounted on the communication system. In the configuration example of FIG. 1, the WAN acceleration device 102 is arranged in the data center 100 together with the server 101. The client computer 111 is located at the long distance base 110. The data center 100 and the long distance base 110 are connected by a WAN 120.

The WAN acceleration device 102 communicates with each of the servers 101 via the LAN in the data center 100. The WAN acceleration device 102 communicates with each client computer 111 of each long-distance base 110 via the WAN.

The client 111 transmits a specific processing request to the server 101 via the WAN 120. The server 101 returns data corresponding to the request from the client computer 111 to the Klein and the computer 111. The WAN acceleration device 102 transfers communication data between the server 101 and the client computer 111. The WAN acceleration device 102 executes predetermined acceleration processing for the selected session. In this example, the WAN acceleration device 102 performs the acceleration processing for the selected TCP session.

The speed-up function is, for example, a function to retransmit only a lost part instead of all blocks in response to detection of packet loss, a function to increase a reception window, a function to reduce a throughput reduction rate in response to detection of packet loss, Includes a function to transmit data exceeding the reception window.

FIG. 2 shows a configuration example of the WAN acceleration device 102. The WAN acceleration device 102 can have a general computer configuration. The WAN acceleration device 102 includes a processor 201, a main storage device 202, a secondary storage device 203, a LAN side network interface (NIF) 204, a WAN side NIF 205, and an input / output device 206. They communicate with each other via a bus.

Main memory device 202 temporarily stores programs and data and accepts reading and writing of data. The secondary storage device 203 stores programs and / or data in a non-transitory storage medium for a long period of time, and the stored programs and data are loaded into the main storage device 202 as necessary. The processor 201 executes a program on the main storage device 202, processes data on the main storage device 202, and writes a result to the main storage device 202. Data updates in the main storage device 202 are reflected in the secondary storage device 203 as necessary.

The LAN side NIF 204 is an interface for connecting to the LAN of the data center 100, and the WAN side NIF 205 is an interface for connecting to the WAN 120. Although FIG. 2 shows one LAN side NIF and one WAN side NIF, a plurality of LAN side NIFs and a plurality of WAN side NIFs may be implemented. Further, a number of processors, main storage devices, and secondary storage devices different from the illustrated numbers may be mounted.

The main storage device 202 and the secondary storage device 203 store software for speeding up communication. The main storage device 202 includes a LAN side reception program 221, a LAN side transmission program 222, a WAN side reception program 223, a WAN side transmission program 224, a session processing program 225, a WAN acceleration control program 226, a UI program 227, and a WAN acceleration analysis. A program 228 is stored. The secondary storage device 203 stores a session management table 231 and a setting table 232.

FIG. 2 shows the program in the main storage device 202 and the table in the secondary storage device 203 for convenience. These are stored, for example, in the secondary storage device 203 and loaded into the main storage device 202 for processing by the processor 201. The program can be installed in the WAN acceleration device 102 by a program distribution server or a computer-readable non-transitory storage medium, and can be stored in the secondary storage device 203.

The input / output device 206 includes an input device such as a keyboard and a mouse, and an output device such as a display device and a printer. As will be described later, the WAN acceleration device 102 may provide a user interface by the input / output device 206 or may provide a user interface by another user terminal connected via a network.

In the example described here, the analysis function (program) is included in the WAN acceleration device 102, but the analysis function may be implemented in a hardware device different from the WAN acceleration device 102.

FIG. 3 shows a logical configuration example of the WAN acceleration device 102. The WAN acceleration device 102 includes a LAN side NIF 204, a WAN side NIF 205, a session management table 231, and a setting table 232. Further, the WAN acceleration device 102 includes a WAN acceleration unit 300, a WAN acceleration control unit 306, a user interface (UI) unit 307, and a WAN acceleration analysis unit 308.

The WAN acceleration unit 300 includes a LAN side reception unit 301, a LAN side transmission unit 302, a WAN side reception unit 303, a WAN side transmission unit 304, a session processing unit 305, a WAN acceleration control unit 306, a UI unit 307, and a WAN acceleration. A conversion analysis unit 308 is included. The WAN acceleration unit 300 further includes a LAN side reception buffer 311, a LAN side transmission buffer 312, a WAN side reception buffer 313, and a WAN side transmission buffer 314. The LAN side reception buffer 311, the LAN side transmission buffer 312, the WAN side reception buffer 313, and the WAN side transmission buffer 314 are prepared for each session.

The processor 201 functions as the functional units 301 to 308 by operating according to the corresponding programs 221 to 228, respectively. The buffers 311 to 314 are formed in the storage area of the main storage device 202.

The setting table 232 stores setting information referred to by the WAN acceleration unit 230. FIG. 4 shows an example of the setting table 232. The setting table 232 is updated by the WAN acceleration control unit 306. The setting table 232 indicates IP addresses to which the high-speed processing is applied, and further indicates settings for these IP addresses.

The setting table 232 indicates, for example, the ID of the LAN side NIF and the ID of the WAN side NIF used by the WAN acceleration unit 230. The computer normally includes a plurality of LAN-side NIFs and a plurality of WAN-side NIFs, and one or more LAN-side NIFs and one or more WAN-side NIFs selected therefrom are given to the WAN acceleration unit 230.

The IP address and port on the LAN side and the IP address and port on the WAN side are grouped, respectively. The setting table 232 specifies an upper limit bandwidth for transmission from the WAN-side NIF for the group. Normally, setting of the upper limit band is unnecessary, but the upper limit band is set when the user intentionally controls the upper limit band according to the IP address of the server or client.

The setting table 232 indicates whether or not a specific acceleration function is applied to the IP address. The WAN speed-up unit 300 has a plurality of speed-up functions, and the setting table 232 indicates whether or not one or more of the speed-up functions are applied to each group. Thereby, when a specific speed-up function does not have an effect or rather hinders speed-up, the speed-up function can be selectively disabled.

When the packet source and destination groups are different, for example, a stricter upper limit bandwidth is applied to the packet. Further, when the specific acceleration function is disabled for one group, the acceleration function for the packet is disabled.

FIG. 5 shows an example of one session table (hereinafter referred to as a session table) included in the session management table 231. The session management table 231 manages monitor information by the WAN optimizer 102 for each session. The session management table 231 is updated and referenced by the WAN acceleration unit 300. The session management table 231 stores information on past sessions to which the speed-up process has been applied and information on current sessions to which the speed-up process has been applied.

Session is identified by session ID. The session end state indicates that the session is continuing or a state at the end of the session. The termination of the session includes the case where the ongoing session is excluded from the target of the acceleration processing in addition to the case where the TCP session is actually terminated.

The endpoint indicates the server 101 or the client computer 111, the window scale indicates the scale factor of the reception window size, the RTT indicates the Round Trip Time, and the MSS indicates the Maximum Segment Size. RTT indicates a delay in packet communication.

The session table for one session is registered in the session management table 231 by the session processing unit 305 at the start of the session. When registering the session table, the session processing unit 305 registers information fixed in the session, such as a session ID, a session start time, a window scale, an endpoint IP address, a reserved buffer size, and an MSS.

The session processing unit 305 further updates values that change during the session, such as RTT, throughput, packet loss rate, and buffer size used, as needed. For example, RTT is an average value in a session, and throughput is the number of bytes per unit time in the time when data is actually communicated excluding no communication time. The buffer size is, for example, an average value from the start of the session, and is an average value of sampling values at regular time intervals (for example, 1 second).

When the session between the server 101 and the client computer 111 is ended or the session is excluded from the target of the speed-up process, the session processing unit 305 registers the session end time and the session end state. The session end state indicates the end of the session itself or the exclusion from the speed-up process target. The session end state further indicates a cause of the end. For example, the session end state indicates the type of packet that ended the session, such as a FIN packet or an RST packet, or an error factor such as a timeout.

Returning to FIG. 3, the WAN side reception unit 303 receives a packet (data) from the client computer 111 via the WAN side NIF 205. The WAN receiving unit 303 acquires packet header information and refers to the setting table 232. If the packet is not the target of the speedup process, the pass-through mode is applied to the packet. The WAN side receiving unit 303 transfers the packet to the LAN side transmitting unit 302. The LAN side transmitting unit 302 transmits the packet to the destination IP address via the LAN side NIF 204 indicated by the setting table 232.

When the setting table 232 indicates that the packet is the target of the speed-up process, the WAN side receiving unit 303 searches the session management table 231 for the session table of the packet. When the session table exists, the WAN side reception unit 303 refers to the session end state field. When the session end state field indicates that the session is not subject to the speed-up process, the WAN-side receiving unit 303 transfers the packet to the LAN-side transmitting unit 302.

When the session end state field indicates that the session is ongoing, the WAN side reception unit 303 stores the packet in the WAN side reception buffer 313. The session processing unit 305 acquires the packet from the WAN reception buffer 313 and updates the session management table 231 according to the header information. Specifically, the session processing unit 305 adds or updates the session table of the packet.

The session processing unit 305 executes speed-up processing for each packet according to the setting table 232. The session processing unit 305 provides a proxy function that terminates TCP communication and transfers packets by TCP communication that executes a higher-speed congestion control algorithm. When the setting table 232 indicates invalidity of a specific acceleration function, the specific function is not executed.

The session processing unit 305 monitors the communication state in the session. Specifically, the session processing unit 305 monitors the use size (stored data amount), RTT, packet loss rate, throughput, and the like in each of the buffers 311 to 314, and updates information related to these in the session table.

The LAN side transmission buffer 312 stores the packet from the session processing unit 305. The LAN side transmission unit 302 acquires the packet from the LAN side transmission buffer 312 and transmits the packet to the transmission destination IP address via the LAN side NIF 204 indicated by the setting table 232.

The LAN side reception unit 301 receives a packet (data) from the server 101 via the LAN side NIF 204. The LAN-side receiving unit 301 acquires packet header information and refers to the setting table 232. When the packet is not the target of the speed-up process, the LAN side receiving unit 301 transfers the packet to the WAN side transmitting unit 304. The WAN side transmission unit 304 transmits the packet to the transmission destination IP address via the WAN side NIF 205 indicated by the setting table 232.

When the setting table 232 indicates that the packet is the target of the speed-up process, the LAN side receiving unit 301 searches the session management table 231 for the session table of the packet. When the session table exists, the LAN side reception unit 301 refers to the session end state field. When the session end state field indicates that the session is not subject to the acceleration processing, the WAN side reception unit 303 transfers the packet to the WAN side transmission unit 304.

When the session end state field indicates that the session is ongoing, the LAN side reception unit 301 stores the packet in the LAN side reception buffer 311. The session processing unit 305 acquires the packet from the LAN side reception buffer 311 and updates the session management table 231 according to the header information. Other processing by the session processing unit 305 is as described above.

The WAN transmission buffer 314 stores the packet from the session processing unit 305. The WAN side transmission unit 304 acquires the packet from the WAN side transmission buffer 314 and transmits the packet to the transmission destination IP address via the WAN side NIF 205 indicated by the setting table 232.

The WAN acceleration controller 306 controls the WAN acceleration unit 300. Details of the processing of the WAN acceleration control unit 306 will be described later with reference to FIG. The UI unit 307 provides an interface for the user 320 (for example, a front-end system engineer or a developer).

User 320 communicates with UI unit 307 via, for example, a user terminal (not shown) and a network. The UI unit 307 receives input from the user terminal, and further transmits output data for presenting predetermined information to the user 320 to the user terminal. The UI unit 307 may accept input from the user via the input / output device of the WAN acceleration device 102 and present information.

The WAN acceleration analysis unit 308 analyzes a session in response to a request from the WAN acceleration control unit 306 or the UI unit 307, and estimates a factor in which the acceleration effect does not appear in the session. Details of the processing of the WAN acceleration analysis unit 308 will be described later with reference to FIGS. 7A to 7C.

FIG. 6 shows a flowchart of a processing example of the WAN acceleration control unit 306. When the session starts, the WAN acceleration control unit 306 starts a timer that expires in a predetermined time for the session (S101). The WAN acceleration control unit 306 can detect the start of a new session by notification from the session processing unit 305 or by referring to the session management table 231.

The WAN acceleration control unit 306 calls the WAN acceleration analysis unit 308 and requests analysis of the session. The WAN acceleration analysis unit 308 analyzes the session in response to the request (S102). Details of the session analysis processing S102 performed by the WAN acceleration analysis unit 308 will be described later.

The WAN acceleration control unit 306 acquires the analysis result from the WAN acceleration analysis unit 308 (S103). The analysis result indicates whether or not a speed-up effect appears in the target session. When the analysis result indicates that the speed-up effect is obtained in the target session (S104: YES), the WAN speed-up control unit 306 waits for the timer to expire (S105).

When the timer expires, the WAN acceleration control unit 306 determines whether the target session is in communication and is targeted for acceleration (S106). Specifically, the WAN acceleration control unit 306 refers to the session end state field in the session table of the target session. When the session end state field indicates the end of the session, the communication of the target session is ended or the target session is excluded from the speed-up target.

If the target session is in communication and is subject to acceleration (S106: YES), the WAN acceleration controller 306 returns to step S101. When the communication of the target session has been completed or the target session has been excluded from the speed-up target (S106: NO), the WAN acceleration control unit 306 ends the process for the target session.

In step S104, when the analysis result indicates that the speed-up effect is not obtained in the target session (S104: NO), the WAN speed-up control unit 306 refers to the analysis result and obtains the speed-up effect. A factor that does not exist is identified (S107).

When the analysis result indicates that the speed-up effect cannot be obtained because the specific (pre-specified) speed-up function is effective (S107: YES), the WAN speed-up control unit 306 The acceleration function is disabled (S108). Thereafter, the WAN acceleration control unit 306 proceeds to step S105.

Specifically, the WAN acceleration control unit 306 instructs the session processing unit 305 in the setting table 232 to disable the specific acceleration function in the target session (session ID). In accordance with the instruction, the session processing unit 305 further holds the instruction in the main storage device 202 until the session ends. The WAN acceleration control unit 306 may disable the specific acceleration function for the IP address of the target session.

When the analysis result indicates a factor unrelated to the specific acceleration function (S107: NO), the WAN acceleration control unit 306 sets the target session to be excluded from the acceleration target (S109). Specifically, the WAN acceleration control unit 306 registers, in the session table of the target session, data indicating that the target session has been excluded from the acceleration target in the session end state field. Thereafter, the WAN acceleration control unit 306 proceeds to step S105.

As described above, the WAN acceleration control unit 306 periodically performs a communication acceleration analysis process, for example, invalidates a specific acceleration function for a session that does not provide an acceleration effect, and does not exhibit the acceleration effect. In this case, the session is excluded from the target for speeding up.

This process can provide a speed-up effect when a specific speed-up function is a factor that cannot achieve the speed-up effect. When the effect of accelerating a session cannot be obtained by the processing of the WAN acceleration unit 300, resources can be effectively used by excluding the session from the accelerating target. The speeding up process can be controlled more appropriately by the stepwise correspondence. By periodically determining whether or not there is a speed-up effect during a session, it is possible to control the speed-up process according to a state change during the session.

7A to 7C show flowcharts of an example of session analysis processing by the WAN acceleration analysis unit 308. FIG. The WAN acceleration analysis unit 308 executes this process in response to a request from the WAN acceleration control unit 306 or the UI unit 307 to specify a session ID.

As shown in FIG. 7A, the WAN acceleration analysis unit 308 refers to the session end state field of the designated session ID in the session management table 231 and identifies the state of the target session. The WAN acceleration analysis unit 308 determines whether the session is terminated due to an error factor (S201).

When the session end state field indicates that the target session is ended due to an error factor (S201: YES), the WAN acceleration analysis unit 308 displays the error factor and a countermeasure corresponding to the error factor. The analysis result shown is returned to the request source (UI unit 307) (S202). The analysis result may indicate only the error factor.

The request before the end of the session is a request from the UI unit 307. The WAN acceleration analysis unit 308 holds countermeasure information indicating a correspondence relationship between an error factor and a solution, and by referring to the countermeasure information, a response associated with the error factor indicated by the session end state field is stored. Decide on a strategy.

When the session end state field indicates a state in which the target session is different from the end due to the error factor (S201: NO), the WAN acceleration analysis unit 308 assumes that the target session is not subject to the acceleration processing. Estimated throughput is calculated (S203). The status where the target session is different from the termination due to an error factor is when the session is continuing (communication), when the session (communication) is terminated due to a factor other than the error factor, and the target session is the target of acceleration Including the case where it deviates from.

The WAN acceleration analysis unit 308 can calculate the estimated WAN-side transmission throughput t (before applying the acceleration) when the acceleration processing is not applied, for example, according to the following equation.

Here, mss is the WAN side transmission MSS, loss is the WAN side loss rate, and rtt is the WAN side RTT. These values are shown in the session table of the target session included in the session management table 231.

The WAN acceleration analysis unit 308 compares the measured throughput after application of acceleration shown in the session management table 231 with the estimated throughput before application of acceleration, and determines whether the acceleration effect has appeared (S204).

For example, the WAN acceleration analysis unit 308 acquires an actual measurement value of the WAN-side transmission throughput of the target session from the session management table 231. The WAN acceleration analysis unit 308 calculates the difference between the estimated throughput calculated according to the above formula and the actually measured throughput acquired from the session management table 231. When the actually measured throughput is higher than the estimated throughput and the difference between the measured throughput exceeds a specified threshold (may be 0), the WAN acceleration analysis unit 308 determines that the acceleration effect appears in the target session.

If it is determined that the speed-up effect is present in the target session (S204: YES), the WAN speed-up analysis unit 308 speeds up the request session (the WAN speed-up control unit 306 or the UI unit 307) in the target session. An analysis result indicating that the effect appears is returned (S205). When it is determined that the speed-up effect does not appear in the target session (S204: NO), the WAN speed-up analysis unit 308 proceeds to the step of FIG.

As described above, when the session termination is caused by an error or when the WAN acceleration effect is manifested, the WAN acceleration analysis unit 308 searches for the factor that does not provide the acceleration effect without searching for the cause. Returns the analysis result shown. It is possible to appropriately estimate factors in a session in which the speed-up effect does not appear.

As shown in FIG. 7B, the WAN acceleration analysis unit 308 determines whether the communication time of the target session exceeds the specified time (S206). The WAN acceleration analysis unit 308 obtains the start time of the target session from the session management table 231 and calculates the elapsed time up to the current time. Thus, the WAN acceleration analysis unit 308 determines whether or not it is estimated that the communication time cannot be achieved.

If the communication time of the target session does not exceed the specified time (S206: NO), the WAN acceleration analysis unit 308 may have a short communication time of the target session as a factor that does not show the speed-up effect. (S207). Since an appropriate communication time may be required before the speed-up effect appears, more accurate estimation of the factors that cannot achieve the speed-up effect is possible. If the communication time of the target session exceeds the specified time, or after step S207, the WAN acceleration analysis unit 308 proceeds to step S208.

In step S208, the WAN acceleration analysis unit 308 determines whether the RTT or loss rate on the WAN side exceeds a specified value. The WAN acceleration analysis unit 308 acquires the WAN-side RTT and WAN-side loss rate of the target session from the session management table 231 and compares them with the corresponding specified values.

When each of the RTT and the loss rate is equal to or less than the corresponding specified value (S208: NO), the WAN acceleration analysis unit 308 indicates that the WAN quality is good or the other communication device that terminates the session is high-speed. It is determined that there is a possibility that this is a factor that does not show the effect (S209). Thereby, it is possible to determine the presence or absence of a factor that makes it unnecessary to apply the speed-up function.

Other communication devices are, for example, SSLVPN (Secure Socket Layer Private Private Network) devices and load balancers, and are arranged between the WAN acceleration device 102 and the WAN 120.

If either one of the RTT and the loss rate exceeds the corresponding specified value (S208: YES), or after step S209, the WAN acceleration analysis unit 308 proceeds to step S210.

In step S210, the WAN acceleration analysis unit 308 determines whether the window scale of the WAN client exceeds a specified value. The WAN acceleration analysis unit 308 acquires the WAN endpoint window scale of the target session from the session management table 231 and compares it with the corresponding specified value.

When the window scale of the WAN side client is less than the specified value (S210: NO), the WAN acceleration analysis unit 308 may have a small effect on the speed increase effect due to the small window scale of the WAN side client. (S211). That is, the WAN acceleration analysis unit 308 determines that the window scale is estimated as a factor. By including the factors in the client-side control in the determination target, it is possible to more accurately estimate the factors that cannot achieve the speed-up effect.

When the window scale of the WAN side client exceeds the specified value (S210: YES), or after step S210, the WAN acceleration analysis unit 308 proceeds to the step of FIG. 7C via the connector 2.

As shown in FIG. 7C, the WAN acceleration analysis unit 308 determines whether the usage rate (one of indexes indicating the usage amount) of the WAN side transmission buffer of the target session is equal to or less than a specified value (S212). As a result, the WAN acceleration analysis unit 308 determines whether there is a factor on the WAN side where the acceleration effect cannot be obtained.

For example, the WAN acceleration analysis unit 308 acquires the reserved WAN transmission buffer size and the used WAN transmission buffer size of the target session from the session management table 231, and stores the WAN transmission buffer size. Calculate usage.

A large usage rate of the WAN side transmission buffer means that data transmission to the WAN 120 is stagnant. The WAN acceleration analysis unit 308 can know the state of data communication in the WAN 120 by referring to the WAN transmission buffer.

When the usage rate of the WAN transmission buffer of the target session exceeds the specified value (S212: NO), the WAN acceleration analysis unit 308 determines whether a specific (pre-specified) acceleration function is set to be valid. (S213). The specific acceleration function is one or several of the acceleration functions exemplified above.

The WAN acceleration analysis unit 308 refers to the setting table 213 or the information obtained from the session processing unit 305 or the WAN acceleration control unit 306, and the specific acceleration function is set to be valid for the corresponding session. Can be determined.

When the specific speed-up function is set to be valid (S213: YES), the WAN speed-up analysis unit 308 determines that the specific speed-up function may be a factor that the speed-up effect does not appear. (S214). When the specific speed-up function is set to be invalid (S213: NO), the WAN speed-up analysis unit 308 determines that there is a possibility that congestion in the WAN is a factor that does not cause the speed-up effect (S215). ).

In this embodiment, congestion in the network means that the amount of data communication is larger than the network capacity. Congestion can be a factor that lowers the actual bandwidth limit of a session, but is not necessarily a factor that greatly deteriorates delay and packet loss. On the other hand, the low communication quality of the network can be a factor that lowers the upper limit of the bandwidth of the session, and can be a factor that greatly deteriorates delay and packet loss.

A large usage rate of the WAN side transmission buffer (S212: NO) indicates that data cannot be transmitted to the WAN 120 at a sufficient speed. A specific speed-up function may inhibit the speed-up effect in the WAN 120. By including such a specific speed-up function as a possible factor, it is possible to more accurately estimate a factor that does not provide a speed-up effect in the WAN.

If the WAN acceleration function is not a factor, it is considered that the factor that the data cannot be transmitted to the WAN 120 at a sufficient speed is the WAN 120 itself. By determining the setting of a specific acceleration function, the factor can be estimated more accurately.

When the usage rate (one index indicating the usage amount) of the WAN side transmission buffer of the target session is equal to or less than the specified value (S212: YES), or after step S214 or S215, the WAN acceleration analysis unit 308 The process proceeds to step S216.

In step S216, the WAN acceleration analysis unit 308 determines whether the usage rate (one of the indexes indicating the usage amount) of the LAN-side reception buffer of the target session exceeds a specified value. As a result, the WAN acceleration analysis unit 308 determines whether there is a factor on the LAN side that cannot achieve the acceleration effect.

The WAN acceleration analysis unit 308 acquires the reserved LAN side reception buffer size and the used LAN side reception buffer size of the target session from the session management table 231 and uses the LAN side reception buffer usage rate. Calculate As will be described below, by referring to the LAN side reception buffer, it is possible to estimate the factor that is present on the LAN side and that the WAN acceleration effect cannot be obtained.

If the usage rate of the reception buffer on the LAN side of the target session is equal to or less than the specified value (S216: NO), the WAN acceleration analysis unit 308 determines whether the RTT and loss rate on the LAN side are equal to or less than the specified value (S217). The WAN acceleration analysis unit 308 acquires the LAN side RTT and the LAN side loss rate of the target session from the session management table 231 and compares them with the corresponding specified values.

When at least one of the RTT and the loss rate exceeds the corresponding specified value (S217: NO), the WAN acceleration analysis unit 308 is a factor that the acceleration effect does not appear because the LAN communication quality is poor. It is determined that there is a possibility (S219).

When each of the RTT and the loss rate is equal to or less than the corresponding specified value (S217: YES), the WAN acceleration analysis unit 308 indicates that the LAN server bandwidth control or the congestion in the LAN is a factor that the acceleration effect does not appear. It is determined that there is a possibility (S218). A small usage rate of the LAN side reception buffer (S216: NO) indicates that data cannot be received from the LAN at a sufficient speed. If there is no problem with the communication quality of the LAN, the cause is considered to be server bandwidth control or congestion in the LAN.

If the usage rate of the LAN side reception buffer of the target session is greater than the specified value (S216: YES), or after step S218 or S219, the WAN acceleration analysis unit 308 proceeds to step S220. In step S <b> 220, the WAN acceleration analysis unit 308 returns an analysis result indicating an estimation factor that does not exhibit the acceleration effect from the determination result so far to the analysis request source (the WAN acceleration control unit 306 or the UI unit 307). . The analysis result for the UI unit 307 also indicates a solution policy for the factor.

As described above, the analysis process estimates one or more factors that the speed-up effect is insufficient. Some or all of the estimated factors may be a factor of insufficient speed-up effect. The user can more easily identify the actual factor by obtaining a primary analysis showing the possible factors. In the flow described with reference to FIGS. 7B and 7C, the determination steps S206, S208, S210, S212, and S216 are in no particular order.

As described above, the analysis process can more appropriately estimate the factor that the speed-up effect does not appear by referring to the information that the WAN speed-up unit 300 monitors in the session. In particular, by searching not only the transport layer information such as the RTT and loss rate but also the information on the transmission / reception buffer usage rate and the setting of a specific speed-up function, the cause of the speed-up effect does not appear. Can be estimated more appropriately.

FIG. 8 shows an example 801 of analysis results presented from the UI unit 307 to the user. The UI unit 307 receives designation of a session to be analyzed from the user, and transmits a session analysis request to the WAN acceleration analysis unit 308 together with the session ID of the designated session. The UI unit 307 generates an analysis result image to be presented to the user based on the analysis result received from the WAN acceleration analysis unit 308, and displays it on the input device 206 or the display device of the user terminal connected via the network. .

The analysis result 801 includes a plurality of sections. Section 811 shows information about the target session, and section 812 shows the result of analysis by the WAN acceleration analysis unit 308.

Sections

813 and 814 show information on the LAN side and WAN side of the target session, respectively. Information of

sections

811, 813, and 814 can be acquired from the session table of the target session in the session management table 231.

Section 812 shows the cause of session termination, whether a speed-up effect is obtained in the session, or a solution policy for obtaining the speed-up effect. In the example of FIG. 8, the termination factor of the session is an RST packet, which indicates that the session has been terminated by a factor different from the error factor (step S201: NO).

Section 812 indicates that the speed-up effect is not obtained in the target session (step S204: NO). Section 812 lists bandwidth control by the LAN side server as the estimation factor (step 218). Section 812 indicates checking the LAN side server (LAN side end point) as a solution policy. In this way, the WAN acceleration analysis unit 308 can hold the text resolution policy associated with the factor.

From the analysis result 801, the user can more easily identify the factor that cannot achieve the speed-up effect and its solution.

In addition, this invention is not limited to the above-mentioned Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

In addition, each of the above-described configurations, functions, processing units, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card or an SD card.

In addition, the control lines and information lines indicate what is considered necessary for the explanation, and not all control lines and information lines on the product are necessarily shown. In practice, it may be considered that almost all the components are connected to each other.

Claims

An apparatus for analyzing a speed-up effect by a communication speed-up apparatus that performs processing for speeding up communication in the first network between a first network and a second network,
A storage device for storing the program, and a processor that operates according to the program,
The processor is
Receive an analysis request from a user with a session specified,
Obtaining monitor information in the acceleration processing for the session by the communication acceleration device;
Analyzing the monitor information to estimate a factor that the effect of the acceleration processing for the session is insufficient,
An apparatus for presenting the estimated factor to the user.
The apparatus of claim 1, comprising:
The processor is
The apparatus which determines whether the said factor estimated exists in the said 1st network side based on the usage-amount of the transmission buffer to the said 1st network of the said communication speed-up apparatus in the said session.
The apparatus of claim 2, comprising:
The processor is
The apparatus which estimates the said factor from the specific high speed function and the traffic of the said 1st network based on the presence or absence of application of the specific high speed function with respect to the said session.
The apparatus of claim 3, comprising:
The processor is
When it is estimated that the specific acceleration function is a factor in which the effect of the acceleration process for the session is insufficient, the communication acceleration device is instructed to stop applying the specific acceleration function to the session. apparatus.
The apparatus of claim 1, comprising:
The processor is
The apparatus which determines whether the said factor estimated exists in the said 2nd network side based on the usage-amount of the reception buffer from the said 2nd network of the said communication speed-up apparatus in the said session.
The apparatus of claim 5, comprising:
The processor is
An apparatus for estimating a factor in which the effect of the speed-up process for the session is insufficient based on a delay amount and a data loss amount in the second network in the session.
The apparatus of claim 1, comprising:
The processor is
The effect of the speed-up process for the session based on the use amount of the transmission buffer to the first network of the communication speed-up device and the use amount of the reception buffer from the second network of the communication speed-up device in the session There is insufficient equipment to estimate the device.
The apparatus of claim 1, comprising:
The apparatus, wherein the processor determines whether the elapsed time is estimated to be the factor based on an elapsed time from the start of the session.
The apparatus of claim 1, comprising:
The session is performed between a first endpoint of the first network and a second endpoint of the second network;
In the first endpoint, the processor estimates that the receivable data amount is the factor based on a data amount receivable from the second endpoint without the first endpoint returning a response. A device that determines whether or not.
A method for analyzing a speed-up effect by a communication speed-up device that performs processing for speeding up communication in the first network between a first network and a second network, the analysis device comprising:
Receive an analysis request from a user with a session specified,
Obtaining monitor information in the acceleration processing for the session by the communication acceleration device;
Analyzing the monitor information to estimate a factor that the effect of the acceleration processing for the session is insufficient,
A method of presenting the estimated factor to the user.
A process of analyzing a speed-up effect by a communication speed-up device that performs processing for speeding up communication in the first network between the first network and the second network by being executed in the computer. A non-transitory storage medium that stores instructions to be executed by
Receive an analysis request from a user with a session specified,
Obtaining monitor information in the acceleration processing for the session by the communication acceleration device;
Analyzing the monitor information to estimate a factor that the effect of the acceleration processing for the session is insufficient,
Presenting the estimated factor to the user.