WO2008023441A1

WO2008023441A1 - Path control program and path control method

Info

Publication number: WO2008023441A1
Application number: PCT/JP2006/316766
Authority: WO
Inventors: Makoto Shinohara
Original assignee: Fujitsu Limited
Priority date: 2006-08-25
Filing date: 2006-08-25
Publication date: 2008-02-28

Abstract

A technique in which the network used by each server or application can be dynamically switched is provided. A path control program (700) includes a virtual network driver section (710) to which an IP address is assigned as a virtual network driver and which receives requests of various applications to transmit/receive IP packets, a path selecting section (741) for selecting a network used for communication on the basis of a predetermined selection logic when a request to transmit an IP packet is received by the virtual network driver section (710), and a packet transfer section (742) for transferring the IP packet to be transmitted through the network selected by the path selecting section (741).

Description

Specification

Route control program and route control method

Technical field

The present invention relates to a path control program and a path control method for determining which network to communicate with another information processing apparatus in an information processing apparatus connected to a plurality of networks. The present invention relates to a route control program and a route control method capable of dynamically switching a network to be used in units of server devices or applications.

Background art

[0002] In a data center or the like in which a large number of server devices operate, there are cases where network traffic is distributed and availability is improved by connecting server devices with a plurality of networks. In such an environment, each server device includes as many network devices as the number of connected networks (hereinafter also simply referred to as “devices”), and an IP address is assigned to each network device.

[0003] In this way, an application that operates on a server device having a plurality of network devices communicates with another application that operates on another server device by using one of the IP addresses assigned to each network device. Was specified explicitly to identify the network through which the communication was performed. Therefore, for example, even if the load on the network used increases, the application must continue to use the network.

[0004] For example, Patent Document 1 discloses a technique for dynamically changing a network to be used in accordance with a load state of the network. The technology disclosed in this document is such that a route control device with a relay device search function periodically obtains load information and the like of each network so that communication is performed through the network with the lowest cost. It is to control.

Patent Document 1: Japanese Patent Laid-Open No. 11 298524

Disclosure of the invention Problems to be solved by the invention

[0006] However, the technique disclosed in Patent Document 1 is to uniformly switch the network used by all server devices belonging to the network, and is in units of server devices or applications. In other words, it was impossible to dynamically switch the network used in the system. In data centers and the like, there is a strong demand for the provision of technology for dynamically switching the network used on a server unit basis or application basis in order to make full use of network performance.

[0007] The present invention has been made in view of the above, and provides a path control program and a path control method capable of dynamically switching a network to be used in units of servers or applications. Objective.

Means for solving the problem

In order to solve the above-described problems and achieve the object, according to one aspect of the present invention, an information processing apparatus connected to a plurality of networks can be connected to other information processing apparatuses via which network. A route control program for determining whether to perform communication, wherein the route control program is assigned a virtual network driver as an virtual network driver, is assigned a virtual network driver, and receives virtual application IP packet transmission / reception requests. And a route selection unit that selects a network used for communication from the networks based on a predetermined selection logic when an IP packet transmission request is received in the virtual network unit, The IP path is transmitted through the network selected by the route selection unit. It functions as a packet transfer unit that performs packet transfer processing.

[0009] Further, in another aspect of the present invention, a route control for determining which network is used to communicate with another information processing device V in an information processing device connected to a plurality of networks. In a virtual network unit assigned with an IP address as a virtual network driver, the various application capabilities also receive an IP packet transmission / reception request process, and the transmission / reception request reception process and the transmission / reception request reception process. A route selection step of selecting a network to be used for communication from the networks based on a predetermined selection logic when a packet transmission request is received; and And a packet transfer step for transferring the IP packet so as to be transmitted through the network selected by the selection step.

[0010] According to these aspects of the invention, the virtual network driver accepts an IP packet transmission request, and transmits the requested IP packet based on the selection logic and transmits it via the selected network. With this configuration, the network used for communication can be dynamically switched in units of server devices or applications.

[0011] In another aspect of the present invention, in the above aspect of the invention, the route selection unit changes a type of selection logic for selecting a network used for communication according to a schedule stored in advance. It is characterized by that.

[0012] According to the aspect of the present invention, the type of selection logic for selecting a network to be used for communication is changed according to a pre-stored schedule. The network to be used can be changed dynamically.

[0013] Further, in another aspect of the present invention, in the above aspect of the invention, the route selection unit may correspond to a port number set in the IP packet and a port number stored in advance and a selection logic. A network used for communication is selected based on a selection logic corresponding to a port number set in the IP packet in comparison with the table.

[0014] According to this aspect of the present invention, the selection logic for selecting a network to transmit an IP packet is changed based on a correspondence table of port numbers and selection logic stored in advance. Therefore, the network to be used can be changed dynamically according to the requirements of each application.

[0015] Further, in another aspect of the present invention, in the above aspect of the invention, the information processing apparatus uses the information of the IP packet transmitted via the virtual network unit for each destination address and port number. The route selection unit further sets the destination address and port number set in the IP packet requested to be transmitted and the information recorded by the communication status recording unit. A selection logic for selecting a network to be used for communication by comparing and obtaining information on the communication status of IP packets having the same destination address and port number and comparing the information with a predetermined threshold. It is characterized by selecting. [0016] According to the aspect of the present invention, since the selection logic for selecting the network that transmits the IP packet is changed based on the actual usage situation, the complicated setting is not required. The network to be used can be changed dynamically according to the communication status of each application.

The invention's effect

[0017] According to one aspect of the present invention, a virtual network driver receives an IP packet transmission request, and transmits the requested IP packet via a network selected based on selection logic. As a result, the network used for communication can be dynamically switched in units of server devices or applications.

[0018] Further, according to another aspect of the present invention, since the type of selection logic for selecting a network used for communication is changed according to a schedule stored in advance, the day of the week or the time zone The network to be used can be dynamically changed according to the requirements of each.

[0019] According to another aspect of the present invention, the selection logic for selecting a network that transmits an IP packet is changed based on a correspondence table of port numbers stored in advance and selection logic. As a result, the network to be used can be dynamically changed according to the requirements of each application.

[0020] Further, according to another aspect of the present invention, since the selection logic for selecting a network to transmit an IP packet is changed based on an actual usage situation, a complicated setting is made. The effect is that the network to be used can be changed dynamically according to the communication status of each application.

Brief Description of Drawings

FIG. 1 is a diagram illustrating an example of address designation in the route control method according to the present embodiment.

FIG. 2 is a functional block diagram showing a node configuration.

FIG. 3 is a functional block diagram showing the configuration of the path control program according to the present embodiment. FIG. 4 is a diagram showing an example of node information.

FIG. 5 is a diagram illustrating an example of setting data.

FIG. 6 is a diagram showing an example of device information.

FIG. 7 is a diagram showing an example of route information.

FIG. 8 is a diagram showing an example of schedule information.

[FIG. 9] FIG. 9 is a flowchart showing the processing procedure of the routing control program at the time of packet transmission.

FIG. 10 is a flowchart illustrating a processing procedure for device selection processing.

[FIG. 11] FIG. 11 is a flowchart showing a processing procedure of the routing control program at the time of packet reception.

FIG. 12 is a functional block diagram showing the configuration of the path control program according to the present embodiment.

FIG. 13 is a diagram showing an example of setting information by port number.

FIG. 14 is a diagram showing an example of communication status information.

[FIG. 15] FIG. 15 is a flowchart showing a processing procedure of a route control program at the time of packet transmission.

FIG. 16 is a flowchart showing a processing procedure of selection logic selection processing.

FIG. 17 is a diagram showing an example of conventional address designation.

Explanation of symbols

11, 12 network

21, 22, 31, 32 IP socket

100, 200, 300, 400 nodes

110, 110, 210, 210

2 1 2

111, 111, 211, 211 Net ヮ-Kudraino

2 1 2

112, 112, 212, 212

2 1 2

310--310, 410 410

n 1 2

311, 311, 411, 411 Net ヮ-Kudraino

2 1 2

312, 312, 412, 412 Applique-Chillon 313,, 413 Virtual network driver

320 CPU

330 Media reader

340 RAM

350 hard disk drive

360 Nose

500 kernel program

600 application programs

700 routing program

710 Virtual network driver

720 Information initialization section

730 Network monitoring unit

740 transmission controller

741 Route selector

742 Packet transfer unit

750 Reception control unit

761 Node information

762 Device information

763 Route information

764 Schedule information

800 Setting data

900 Routing program

910 Virtual network driver

920 Information initialization section

940 Transmission control unit

941 Route selector

965 Setting information by port number

966 Communication status information 970 Communication Status Recorder

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of a route control program and a route control method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Example 1

First, a description will be given of how address designation has conventionally been performed in an environment in which nodes are connected to a plurality of networks. In this specification, the term “node” represents various information processing devices such as a server device and a personal computer connected to a network.

FIG. 17 is a diagram showing an example of conventional address designation. As shown in the figure, the node 100 is connected to the network 11 via the network device 110 and is connected to the network device.

1

It is connected to the network 12 via the chair 110. Node 200 is a network

2

Connected to network 11 via device 210 and via network device 210

1 2 Connected to network 12.

[0026] In such an environment, an application running on the node 100 112 power node 2

1

It is assumed that the application 212 running on 00 communicates. Multiple network devices

1

In a node equipped with a chair, an IP address is usually assigned to each network driver that controls the network device, and by specifying this IP address, it is determined which network device is used for communication.

[0027] Therefore, the application 112 controls the network device 110 that controls the network device 110.

1 1

Specify the IP address assigned to the network driver 111 as the source

1

IP address assigned to network driver 211 that controls device 210

1 1

The IP address assigned to the network driver 111 that communicates via the network 11 or controls the network device 110

twenty two

And assign it to the network driver 211 that controls the network device 210

2 2 By specifying the specified IP address as the destination, it is necessary to communicate via the network 12, or to communicate with either V or Vs. [0028] Here, application 112 communicates with application 212 via 1S network 11.

1 1 It is assumed that the administrator has set up to communicate. In this case, the network driver 111

The IP address assigned to 1 is “10. 124. 128. 11” and the network driver 211

Assuming that the IP address assigned to 1 is “10. 124. 128. 21”, the application 112 sets “10. 124. 128. 11” as the transmission destination of the IP packet 21 to be transmitted.

1

Specify "10. 124. 128. 21" explicitly.

[0029] As a result of such an explicit specification, the IP packet is also sent out by the application 112. 21

1

The source address (SA) and destination address (DA) are set to “10. 124. 128. 1 1” and “10. 124. 128. 21”, respectively. Is transmitted to the application 212 via the.

1

[0030] In addition, the application 112 that runs on the node 100

2

The administrator has configured to communicate with application 212 running on

2

Shall be. In this case, the IP address assigned to the network driver 111 is “10

2

124.128.12 ”and the IP address assigned to the network driver 211 is“ 10.

2

124. 128. 22 ", the application 112 sends the IP knot 22 to be sent.

2

Explicitly specify “10. 124. 128. 12” as the source and “10. 124. 128. 22” as the destination.

[0031] As a result of such an explicit specification, the IP packet is also sent out by the application 112. 22

2

The source address (SA) and destination address (DA) are set to “10. 124. 128. 12” and “10. 124. 128. 22”, respectively. Is transmitted to the application 212 via the.

2

[0032] Thus, conventionally, in an environment in which a node is connected to a plurality of networks, an application operating on the node communicates with an application operating on another node via a predetermined network. Therefore, the IP address assigned to the network driver that controls each network device was explicitly specified.

[0033] For this reason, when there are a large number of applications to be operated, there is a heavy load on the administrator who sets each application to use an appropriate network. Also, when there is a lot of traffic on a network, there is little traffic When using a network, it was difficult to switch the network used by the application depending on the situation.

Next, address designation in the route control method according to the present embodiment will be described. FIG. 1 is a diagram illustrating an example of address designation in the route control method according to the present embodiment. As shown in the figure, the node 300 is connected to the network 11 via the network device 310.

1

Connected to the network 12 via the network device 310. Also,

2

The network 400 is connected to the network 11 via the network device 410, and the network

1

Connected to the network 12 via the network device 410.

2

[0035] Similarly, other nodes also include a plurality of network devices, which are connected to the network 11 via any one of the network devices and connected to the network 12 via other network devices. And

[0036] In such an environment, an application that runs on the node 300 312 force node 4

1

Suppose that it communicates with an application 412 running on 00. Route control according to this embodiment

1

In this method, each application communicates with other applications by specifying the representative IP address assigned to the virtual network driver provided in the node, regardless of how many network devices the node has. Do it.

In the example of FIG. 1, the node 300 is provided with a virtual network driver 313, and the node 400 0 is provided with a virtual network driver 413. A representative IP address “10. 124. 128. 10” is assigned to the virtual network driver 313, and a representative IP address “10. 124. 128. 20” is assigned to the virtual network driver 413. Assigned.

[0038] And the application that runs on the node 300 312 force that runs on the node 400

1

When communicating with application 412, application 312 sends an IP packet

1 1

Specify “10. 124. 128. 10” as the source of 31 and “10. 124. 128. 20” as the destination. The IP packet 31 thus designated is received by the virtual network driver 313 and transmitted to the application 412 via the network selected by a predetermined selection logic.

1

[0039] Similarly, an application that runs on node 300 312 that runs on node 400 When communicating with application 412, application 312 sends an IP packet

twenty two

Specify “10. 124. 128. 10” as the source of 31 and “10. 124. 128. 20” as the destination. The designated IP packet 32 is received by the virtual network driver 313 and transmitted to the application 412 via the network selected by a predetermined selection logic.

1

[0040] As described above, in the addressing in the routing control method according to the present embodiment, even if the node includes a plurality of network devices, each application has only one virtual network driver for each node. By specifying the representative IP address assigned to, it is possible to communicate with applications running on other nodes without explicitly specifying individual network devices.

That is, by applying the route control method according to the present embodiment, the load for designating the IP address to be used for each application is reduced. Also, depending on the settings of the selection logic, when there is a lot of traffic on a certain network, the network used by the application can be switched depending on the situation. It becomes possible.

Next, the configuration of the node 300 shown in FIG. 1 will be described. Note that other nodes such as the node 400 shown in FIG. FIG. 2 is a functional block diagram showing the configuration of the node 300.

[0043] As shown in the figure, the node 300 includes network devices 310 to 310n and various arithmetic processing units.

1

CPU (Central Processing Unit) 320 that performs processing, a medium reader 330 that reads a program from a recording medium, a random access memory (RAM) 340 that temporarily stores various information, and a hard disk device that can store various information 350 Are connected by bus 360.

[0044] The hard disk device 350 includes a kernel program 500 that is a basic part of the operating system that controls the operation of the node 300, an application program 600 that executes various processes such as network communication according to the purpose, and a main program. The path control program 700 for realizing the path control method according to the embodiment and the setting data 800 used by the path control program 700 are stored. The kernel program 500 is expanded on the RAM 340 by the CPU 320 when the node 300 is activated, and functions as an operating system. In this process, the path control program 700 is also expanded on the RAM 340 by the CPU 320, reads the setting data 800, and starts executing various processes for realizing the path control method according to the present embodiment. Become.

[0046] Specifically, in the routing control program 700, a part corresponding to the virtual network driver 313 is incorporated into the operating system as a driver, and the other part is executed outside the operating system as a daemon. . Alternatively, a part of the routing program 700 other than the part corresponding to the virtual network driver 313 may be incorporated into the operating system.

[0047] Note that the path control program 700 is not necessarily stored in the hard disk device 350, and the node 300 may read and execute this program stored in a storage medium such as a CD-ROM. Good. In addition, this program is stored in another information processing apparatus connected to the node 300 via a public line, the Internet, a LAN (Loca 1 Area Network), a WAN (Wide Area Network), etc. Read the program and execute it.

[0048] Next, the configuration of the route control program 700 will be described. FIG. 3 is a functional block diagram showing the configuration of the route control program 700 according to the present embodiment. As shown in the figure, the path control program 700 includes a virtual network driver unit 710, an information initialization unit 720, a network monitoring unit 730, a transmission control unit 740, a reception control unit 750, and node information 761. , Device information 762, route information 763, and schedule information 764.

The virtual network driver unit 710 is a processing unit that functions as a virtual network driver in the node where the path control program 700 operates, and corresponds to the virtual network driver 313 shown in FIG. The virtual network driver unit 710 functions as an interface for exchanging IP packets with an application that operates on a node on which the routing control program 700 operates.

[0050] The information initialization unit 720 is a processing unit that initializes the node information 761, the device information 762, the route information 763, and the schedule information 764 after the route control program 700 is started. The Details of these information are shown below.

FIG. 4 is a diagram illustrating an example of the node information 761. As shown in the figure, the node information 761 is information indicating the correspondence between the node and the representative IP address, and includes items such as a node name and a representative IP address. The node name indicates the host name of the node, and the representative IP address indicates the IP address assigned to only one virtual network driver that exists in the node. The information initialization unit 720 initially generates node information 761 by reading a predetermined portion of the setting data 800.

Here, an example of the setting data 800 is shown. FIG. 5 is a diagram illustrating an example of the setting data 800. As shown in the figure, in the setting data 800, the representative IP address assigned to each node is registered. In addition, for each network device provided in each node, the IP address assigned to the network driver corresponding to those network devices and the transmission and reception of IP packets in the network to which those network devices are connected are prohibited. A list of port numbers is also registered.

FIG. 6 is a diagram showing an example of device information 762. As shown in the figure, device information 762 is information related to network devices provided by other nodes, and includes node name, device name, IP address, prohibited port, transfer speed, maximum transmission unit (MTU) length, It has items such as transfer frequency and failure rate. The node name indicates the host name of the node where the network device exists, and corresponds to the node name of the node information 761.

[0054] The device name is the name of the network device, and the IP address is the IP address assigned to the network driver corresponding to the network device. The prohibited port is an item that sets a list of port numbers that are prohibited from sending and receiving IP packets in the network to which the network device is connected. The transfer rate, MTU length, transfer frequency, and failure rate are the transfer rate, MTU length, transfer frequency, and failure rate of the network to which the network device is connected.

The information initialization unit 720 initially generates a node name to a prohibited port of the device information 762 by reading a predetermined part of the setting data 800. Then, after initial generation of route information 763 to be described later, it communicates with other nodes using connectable routes, and based on the result, the transfer rate and MTU length of each network are measured to initialize the information. Part 720 Determine. For the transfer frequency and failure rate, the information initialization unit 720 sets the value to 0, and the update is performed by the network monitoring unit 730.

FIG. 7 is a diagram showing an example of route information 763. As shown in the figure, the path information 763 is information indicating a connection relationship between network devices, and includes items such as a self-node device, another node device, and a connection state. The own node device is an IP address corresponding to the network device actually provided by the node on which the routing control program 700 is operating, and the other node device is the IP address corresponding to the network device actually provided by the other node. . FIG. 7 is an example of route information 763 in the node 300.

The connection state indicates whether or not connection is possible between the network device indicated by the own node device and the network device indicated by the other node device. The information initialization unit 720 initially generates route information 763 by reading a predetermined part of the setting data 800. The connection state is initialized by the information initialization unit 720 and then updated by the network monitoring unit 730 so as to actually reflect the connection state.

FIG. 8 is a diagram showing an example of schedule information 764. As shown in the figure, the schedule information 764 is information indicating a schedule for changing the selection logic to be applied, and includes one item, a day of the week, a time zone, and a selection logic. The day of the week and the time of day are the day of the week and the time of day to which the corresponding selection logic applies. In this example, the schedule is expressed by a combination of the day of the week and the time zone. However, the schedule may be expressed by a combination of the date and the time zone.

[0059] The selection logic is a logic for selecting a network to be used for a plurality of network power communication to which a node is connected. "Reliability priority", "Transfer frequency priority", "Transfer speed priority" ”. “Reliability priority” is the logic that preferentially selects the network with the lowest failure rate, and “Transfer frequency priority” is the logic that preferentially selects the network with the lowest transfer frequency. “Priority” is the logic that preferentially selects the network with the highest transfer rate.

[0060] In this way, by setting the selection logic to switch according to the schedule, for example, "reliability priority" is set so that communication errors do not occur at night and weekends when there are few operation managers. Based on selection logic, select a network and execute batch processing Select a network based on the "transfer speed priority" selection logic during times when a large amount of information needs to be exchanged at high speed, such as during certain times, and network traffic does not increase at other times. As described above, when a network is selected based on the selection logic of “transfer frequency priority”, it is possible to set so that communication is performed with an optimal network according to the situation.

[0061] The network monitoring unit 730 refers to the route information 763 and periodically uses the PING and netstat commands to monitor each network, reflects the connection status in the route information 763, and transfers the obtained transfer. This is a processing unit that sets the frequency and failure rate in the device information 762.

The transmission control unit 740 is a control unit that controls transmission of IP packets, and includes a route selection unit 741 and a packet transfer unit 742. The route selection unit 741 is a processing unit that selects which network is used to transmit a packet.

Specifically, when the virtual network driver unit 710 receives an IP packet, the route selection unit 741 compares the current date and time with the schedule information 764 and determines the selection logic to be applied. After referring to the node information 761 and identifying the node specified as the destination address, the device information 762 and the route information 763 are referred to, and the selection logic in the available network is the most. Select a matching network.

[0064] The packet transfer unit 742 rewrites the transmission destination address and the transmission source address of the IP packet so that the IP packet is transmitted via the network selected by the route selection unit 741, and transmits the rewritten transmission. This processing unit forwards IP packets to the network driver corresponding to the original address.

[0065] Reception control section 750 is a control section that controls reception of IP packets. Specifically, the reception control unit 750 monitors reception of an IP packet by a network driver corresponding to each network device, and acquires an IP packet received by any network driver of V or any one of them. After rewriting the destination address and source address so that the combination of the representative IP address is obtained, specify the port number set in the IP packet via the virtual network driver unit 710 and wait for reception. The IP packet to the current application.

Next, the processing procedure of the route control program 700 shown in FIG. 3 will be described. Figure 9 5 is a flowchart showing a processing procedure of the route control program 700 at the time of packet transmission. This processing procedure is executed each time an IP packet destined for another node is received by the virtual network driver unit 710.

[0067] As shown in the figure, when the virtual network driver unit 710 receives an IP packet (step S101), the route selection unit 741 refers to the schedule information 764 and selects the selection logic corresponding to the current date and time. Is acquired (step S102). Then, a device selection process to be described later is executed to select a network device to be used for communication between the destination node and the own node (step S103).

[0068] Then, the packet transfer unit 742 rewrites the IP packet address so that the network device selected in step S103 becomes the transmission destination and the transmission source (step S104), and the packet transfer unit 742 updates the IP packet address selected in step S103. The IP packet is transferred to the network driver corresponding to the network device so that the IP packet is transmitted from the network device power of the node (step S 105).

FIG. 10 is a flowchart illustrating a processing procedure of device selection processing. As shown in the figure, the route selection unit 741 identifies the destination node by comparing the destination address of the IP packet received by the virtual network driver unit 710 with the node information 761 (step S201), and device information From 762, information on the network device provided in the node is extracted (step S202).

[0070] Then, according to the selection logic acquired in step S102, one network device with the highest priority is selected (step S203). If there is no corresponding network device (No at step S204), predetermined error processing is executed.

On the other hand, if the network device with the highest priority can be selected in Step S203 (Yes in Step S204), the port number set in the IP packet is acquired (Step S205). Then, referring to the prohibited port item in the device information 762, if the acquired port number is forbidden to transmit / receive in the network corresponding to the selected destination network device (Yes in step S206). ), Excluding the selected network device (step S209), returning to step S203, selecting the network device with the next highest priority, and performing the subsequent processing again. [0072] If the port number acquired in step S205 does not correspond to a prohibited port (No in step S206), refer to route information 763 and the network device of the local node that can be connected to the selected destination network device. Is selected (step S207). If there is no corresponding network device (No at step S208), the selected destination network device is excluded from the selection target (step S209), and the process returns to step S203 and the next higher priority network is selected. Select the device and re-execute the subsequent processing.

On the other hand, if the corresponding network device exists, the network device is set as the transmission source network device, and the processing is ended with the network device selected in step S203 as the transmission destination network device.

For example, from the application 312 of the node 300, “10. 124” is set as the destination IP address.

1

128.20 ”is specified, and when an IP packet specifying“ 10.124.128.10 ”is transmitted as the source IP address and the selection logic is“ transfer speed priority ”, first, step S201 In this case, it is specified that the destination node is host B.

Subsequently, in step S202, it is determined that the network device powers “device Bl” and “device B2” of the host B are provided. In step S203, since the selection logic is “transfer speed priority”, if the device information 762 is as shown in FIG. 6, “device B2” having the highest transfer speed is selected. Since there is a corresponding network device, Step S204 is Yes.

[0076] Subsequently, in step S205, the port number set in the IP packet is acquired. Here, if the acquired port number is “20” and the device information 762 is as shown in FIG. 6, it is found in step S206 that the port is a prohibited port of “device B2” (step S206 Yes), and in step S209, the selected “device B 2” is not selected.

Then, the process returns to step S203 again, and “device Bl” satisfying the selection logic other than “device B2” is selected. Since no prohibited port is set for “Device Bl”, Step S206 is No.

[0078] Subsequently, in step S207, the network of the local node that can be connected to "device Bl" Device is extracted. Referring to device information 762 in Fig. 6, the IP address of “Device Bl” is “10. 124. 11. 20”. Then, referring to the route information in Fig. 7, it is found that the own node device that can be connected to this IP address is “10. 124.11. 11.10”. Then, since the corresponding network device exists, step S208 becomes Yes, and the process ends.

FIG. 11 is a flowchart showing a processing procedure of the route control program 700 at the time of packet reception. This processing procedure is repeatedly executed by the reception control unit 750 after the initial processing by the information initialization unit 720 is completed.

[0080] As shown in the figure, the reception control unit 750 monitors the reception of the IP packet by the network driver corresponding to each network device of its own node (step S301), and if the IP packet is received, The IP packet is acquired (step S302).

[0081] Then, referring to the device information 762 and the node information 761, the source address and destination address of the IP packet are rewritten to the representative IP address (step S303), and the virtual network driver unit 710 Specify the port number set in the IP packet and wait for reception! /, Then deliver the IP packet to the application (step S304).

Example 2

In the first embodiment, an example of a routing control program and a routing control method in which a representative IP address is provided for each node and a network used for communication is dynamically changed in units of nodes has been described. It is also possible to configure the network to dynamically change on a per-application basis. Therefore, in this embodiment, an example of a route control program and a route control method capable of dynamically changing a network used for communication in units of applications will be described.

First, the configuration of the path control program 900 according to the present embodiment will be described. FIG. 12 is a functional block diagram showing the configuration of the path control program 900 according to the present embodiment. The route control program 900 is a program that is stored and executed in an information processing apparatus or the like connected to a plurality of networks such as the node 300 like the route control program 700 described above.

As shown in the figure, the path control program 900 includes a virtual network driver unit 910, Information initialization unit 920, network monitoring unit 730, transmission control unit 940, reception control unit 750, node information 761, device information 762, route information 763, setting information by port number 965, Communication status information 966 and a communication status recording unit 970 are included.

In the same figure, the processing units and information using the same reference numerals as in FIG. 3 indicate that they are the same as those in FIG. 3, and in order to avoid duplication, a detailed description thereof will be given. It will be omitted.

The virtual network driver unit 910 is a processing unit that functions as a virtual network driver in a node where the path control program 900 operates, and corresponds to the virtual network driver 313 shown in FIG. The virtual network driver unit 710 functions as an interface for exchanging IP packets with applications running on the node where the routing control program 700 runs, and also communicates information about IP packets sent via itself. The status recording unit 970 is notified and recorded in the communication status information 966.

The information initialization unit 920 is a processing unit that initializes the node information 761, device information 762, route information 763, and port number-specific setting information 965 after the route control program 900 is activated. FIG. 13 is a diagram showing an example of the setting information 965 by port number. As shown in the figure, the port number-specific setting information 965 is information indicating the correspondence between the port number and the selection logic, and has items of port number, selection logic, and! / と.

[0088] The port number is a number for specifying an application as a communication partner in combination with the IP address, and corresponds almost one-to-one with the application. The selection logic is a logic for selecting a network that is also used for communication by a plurality of network powers to which the node is connected, and has values such as “reliability priority”, “transfer frequency priority”, and “transfer speed priority”. .

[0089] It should be noted that, in the port number-specific setting information 965, only the port numbers for which the selection logic is to be explicitly specified need to be registered, and all the port numbers and the selection logic for communication using the port numbers are used. It is not necessary to register a combination of. When registered using the port number setting information 965 and communication is performed using the port number, an appropriate selection logic is set based on the information recorded in the communication status information 966 by the communication status recording unit 970. Automatically selected. The communication status recording unit 970 is a processing unit that records information on the IP packet transmitted via the virtual network driver unit 910 in the communication status information 966 for each destination IP address and port number. FIG. 14 is a diagram showing an example of the communication status information 966. As shown in FIG. As shown in the figure, the communication status information 966 includes items such as a destination representative IP address, a port number, the number of transmissions, and a transmission amount.

The transmission destination representative IP address is the transmission destination address set in the IP packet, and the port number is the port number set in the IP packet. The number of transmissions and the amount of transmissions are the cumulative number of transmissions and transmissions of IP packets with that IP address and port number.

The transmission control unit 940 is a control unit that controls transmission of IP packets, and includes a route selection unit 941 and a packet transfer unit 742. The route selection unit 941 is a processing unit that selects which network is used to transmit a packet.

[0093] Specifically, when the virtual network driver unit 710 receives an IP packet, the route selection unit 941 refers to the port number setting information 965, and sets the port number set in the IP packet. If the corresponding selection logic is registered !, the network to be used is selected using the selection logic.

[0094] If there is no corresponding information in the port number-specific setting information 965, the route selection unit 941 refers to the communication status information 966, and transmits the IP transmitted by designating the same destination address and port number. Select an appropriate selection logic based on the number of packets sent and the amount of transmission, and use that selection logic to select the network to use.

Next, the processing procedure of the route control program 900 shown in FIG. 12 will be described. FIG. 15 is a flowchart showing the processing procedure of the route control program 900 at the time of packet transmission. This processing procedure is executed every time an IP packet destined for another node is received by the virtual network driver unit 910.

[0096] As shown in the figure, when the virtual network driver unit 910 receives an IP packet (step S401), the route selection unit 941 executes selection logic selection processing described later to select the selection logic. (Step S402). Then, the device selection process already described is executed to select a network device to be used for communication between the destination node and the own node (step S403). [0097] Then, the packet forwarding unit 742 rewrites the IP packet address so that the network device selected in step S403 becomes the transmission destination and transmission source (step S404), and the packet forwarding unit 742 rewrites the own node selected in step S403. The IP packet is transferred to the network driver corresponding to the network device so that the IP packet is transmitted from the network device (step S405).

FIG. 16 is a flowchart showing a processing procedure of selection logic selection processing. As shown in the figure, the route selection unit 941 searches the port number setting information 965 using the port number of the IP packet received by the virtual network driver unit 910 as a key (step S501), and there is such information. If (Yes at step S502), the selection logic included in the retrieved information is selected and the process is terminated (step S503).

[0099] For example, from the application 312 of the node 300, “10.

1

.128.20 ”,“ 10.124.128.10 ”as the source IP address, and“ 2080 ”as the port number are sent. 13 is as shown in FIG. 13, the selection logic corresponding to the port number is found in step S501, and “transfer speed priority” is selected as the selection logic (step S503).

On the other hand, if there is no information corresponding to the port number setting information 965 (No in step S502), the communication status information 966 is searched using the destination address and port number of the IP packet as keys (step S504). If there is applicable information (Yes at step S505), the transmission amount included in the retrieved information is divided by the elapsed time after startup to calculate the transmission amount per hour (step S506). If the transmission amount is equal to or greater than the predetermined threshold (Yes at Step S507), “Transfer priority” is selected as the selection logic so that a large amount of IP packets can be processed at high speed, and the process is terminated (Step S507). S508).

[0101] If the transmission amount per time is smaller than the predetermined threshold (No at step S507), the number of transmissions included in the retrieved information is divided by the elapsed time after startup to calculate the number of transmissions per hour. (Step S509) If the number of transmissions per hour is equal to or greater than the predetermined threshold (Yes at Step S510), select "Transfer Frequency Priority" as the selection logic so that traffic does not overflow with a large number of IP packets. To end the processing (step S511). [0102] When the number of transmissions per time is smaller than the predetermined threshold (No at Step S510), and when information corresponding to the communication status information 966 is strong at Step S504 (No at Step S505), “Reliability priority” is selected as the selection logic so that no communication error occurs, and the process is terminated (step S512).

Note that the configurations of the above-described route control programs 700 and 900 can be variously changed without departing from the scope of the present invention. For example, the route control programs 700 and 900 can be combined so that the network to be used can be switched for each application according to a pre-stored schedule.

Further, in each of the above-described embodiments, the determination and selection of a prohibited port using only the port number and the selection logic are performed. These determinations and selections are performed by a combination of the protocol number and the port number. Moyo.

Industrial applicability

As described above, the route control program and the route control method according to the present invention communicate with other information processing devices via any network, in addition to information processing devices connected to a plurality of networks. This is useful when deciding whether or not to perform the operation, and is particularly suitable when it is necessary to dynamically switch the network to be used in units of servers or applications.

Claims

The scope of the claims

[1] A path control program for determining which network to communicate with another information processing apparatus in an information processing apparatus connected to a plurality of networks, wherein the path control program is the information processing apparatus The

A virtual network unit that is assigned an IP address as a virtual network driver and accepts transmission / reception requests for various application power IP packets,

A path selection unit that selects a network that uses both the network's core and communication based on a predetermined selection logic when an IP packet transmission request is received in the virtual network unit;

A packet forwarding unit that performs forwarding processing of the IP packet to be transmitted through the network selected by the route selection unit

A path control program characterized by functioning as

2. The route control program according to claim 1, wherein the route selection unit changes the type of selection logic for selecting a network used for communication according to a schedule stored in advance.

[3] The route selection unit compares the port number set in the IP packet with a port number stored in advance and a correspondence table of selection logic to obtain the port number set in the IP packet. 2. The route control program according to claim 1, wherein a network used for communication is selected based on a corresponding selection logic.

[4] The information processing apparatus further functions as a communication status recording unit that records information of IP packets transmitted via the virtual network unit for each destination address and port number,

The route selection unit compares the transmission destination address and port number set in the IP packet requested to be transmitted with the information recorded by the communication status recording unit to obtain the same transmission destination address. 2. Information on the communication status of an IP packet having a port number is acquired, the information is compared with a predetermined threshold, and selection logic for selecting a network used for communication is selected. The routing control program described in 1.

[5] The route selection unit includes an IP packet having a port number set in the IP packet. 5. The route control program according to claim 1, wherein a network that is used for communication is selected by excluding a network that is prohibited from transmitting and receiving data.

[6] The information processing apparatus further functions as a network monitoring unit that monitors a connection state of the network,

The route selection unit selects a network used for communication, excluding a network that is determined to be inaccessible by the network monitoring unit.

The route control program according to any one of 1 to 4.

[7] The route selection unit, according to any one of claims 1 to 4, wherein the route selection unit selects a network that is used for communication in accordance with a selection logic that selects the network with the highest transfer rate. The routing control program described in 1.

[8] The route selection unit according to any one of [1] to [4], wherein the route selection unit selects a network that is used for communication according to a selection logic that selects the network with the lowest transfer frequency. The routing control program described in 1.

[9] The route selection unit according to any one of [1] to [4], wherein the route selection unit selects a network that is used for communication in accordance with a selection logic that has the lowest failure rate and selects the network with priority. The routing control program described in 1.

[10] An information processing apparatus connected to a plurality of networks, a route control method for determining which network to communicate with other information processing apparatuses,

In the virtual network section to which an IP address is assigned as a virtual network driver, various application capabilities also receive / receive a request to send / receive an IP packet,

A route selection step of selecting a network used for the central communication of the network based on a predetermined selection logic when an IP packet transmission request is received in the transmission / reception request reception step;

A packet transfer step for transferring the IP packet so that it is transmitted through the network selected by the route selection step;

A path control method characterized by comprising: