JP2014168129A - Network switching information notification device and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contribute to shortening of the time until the session is resumed for interruption of session due to network switching.SOLUTION: A network switching information notification device includes an analysis section 11 for analyzing an IP packet which is inputted to each network interface IFa, IFb, IFc and outputted therefrom, and outputting packet analysis information S1 indicating an IP address corresponding to the terminal related to the IP packet thus analyzed, a management section 12 for recording the packet analysis information S1, and acquiring an IP address corresponding to the terminal from the record when NW switching information is inputted, and outputting the IP address, and a creation section 13 for creating a NW switching notification message S3 addressed to the IP address thus outputted. The NW switching notification message S3 is transmitted from the network interface IFc on the terminal side.

Description

  The present invention relates to a network switching information notification device and a computer program.

  Conventionally, a mobile router 100 shown in FIG. 3 is known. The mobile router 100 has network interfaces IFa and IFb on the WAN (Wide Area Network) side and a network interface IFc on the LAN (Local Area Network) side, and performs routing between the WAN and the LAN. In the example of FIG. 3, on the WAN side, the network interface IFa can be connected to the base station 201 of the LTE network, and the network interface IFb can be connected to the base station 202 of the WiMAX network. On the other hand, on the LAN side, the network interface IFc can be connected to the terminal 300. For example, a wireless LAN such as WiFi is known as the network interface IFc.

  In FIG. 3, the mobile router 100 has a function of automatically switching the WAN to be connected according to the network state on the WAN side. For example, in the case of connection to the base station 201 of the LTE network, the connection is automatically switched to the base station 202 of the WiMAX network when communication between the base stations 201 occurs or when the quality measurement result is bad. Then, since the network interface to be used is switched from the network interface IFa (IP address A) to the network interface IFb (IP address B) on the WAN side of the mobile router 100, the IP address changes.

  When the change of the IP address on the WAN side in the mobile router 100 described above occurs, the session in which the terminal 300 is communicating cannot be continued, and a session disconnection occurs (for example, see Non-Patent Document 1). In this case, the terminal 300 reestablishes the session after its communication request times out (see, for example, Non-Patent Document 2). Non-Patent Document 1 proposes a mechanism in which a home agent device (Home Agent) is provided on a network and the IP address is not changed by the mobile IP even when the network is switched.

Yosuke Fukuyama, Hidekazu Suzuki, Watanabe, “Proposal of a Method for Seamlessly Moving Between Mobile Phone Network and Wireless LAN in IPv4 Mobile Communication”, Proceedings of Multimedia, Distributed, Cooperation and Mobile (DICOMO2011) Symposium, Vol.2011 , No.1, pp.1115-1120, Jul.2011. W. Richard Stevens, “TCP / IP Illustrated Volume 1: The Protocols”, Addison-Wesley Professional, December 31, 1993

  As described above, in the conventional mobile router, when the WAN-side network is switched, the session of the terminal is disconnected. However, until the session of the terminal is restarted, it is necessary to wait until the communication request of the terminal is timed out. .

  The present invention has been made in consideration of such circumstances, and it is an object of the present invention to provide a network switching information notification device and a computer program that can contribute to shortening the time until session resumption for session disconnection due to network switching. And

  In order to solve the above-described problem, a network switching information notification device according to the present invention includes a plurality of second network devices that input and output IP packets between a first network interface on a terminal side and the first network interface. A network switching information notifying device in a network switching device having a network interface, analyzing IP packets input to and output from each network interface, and outputting packet analysis information indicating IP addresses corresponding to the terminals related to the analyzed IP packets An analysis unit that records the packet analysis information, and when network switching information is input, a management unit that acquires and outputs an IP address corresponding to the terminal from the record, and an IP output from the management unit Network switching notification message addressed to the address And a creation unit for creating over di-, to transmit the network switching notification message from the first network interface, and wherein the.

  In the network switching information notification device according to the present invention, the analysis unit outputs, as the packet analysis information, an IP address corresponding to the terminal related to the analyzed IP packet and identification information of the second network interface to be used. The management unit is characterized in that, based on the network switching information, an IP address corresponding to the terminal that uses the second network interface in which switching has occurred is acquired from the record and output.

  In the network switching information notification device according to the present invention, the analysis unit includes, as the packet analysis information, an IP address and a port number corresponding to the terminal related to the analyzed IP packet, and identification information of the second network interface to be used. The management unit obtains and outputs an IP address and a port number corresponding to the terminal using the second network interface in which switching has occurred based on the network switching information, and outputs the IP address and port number; The creation unit creates a network switching notification message destined for the IP address and port number output from the management unit.

  In the network switching information notification device according to the present invention, the network switching notification message is distributed as push type information from the first network interface.

  A computer program according to the present invention provides a network switching in a network switching device having a first network interface on a terminal side and a plurality of second network interfaces that input and output IP packets between the first network interface A computer program for performing information notification processing, comprising: analyzing a packet that is input to and output from each network interface; and outputting packet analysis information indicating an IP address corresponding to the terminal; and the packet analysis information When recording and network switching information is input, a management step of acquiring and outputting an IP address corresponding to the terminal from the record, and a network switching notification message destined for the IP address output from the management step A generating step of forming, characterized by said network switch notification message is a computer program for executing a transmission step of transmitting, to the computer from the first network interface.

  According to the present invention, it is possible to obtain an effect that it is possible to contribute to shortening the time until session resumption with respect to session disconnection due to network switching.

It is a block diagram which shows the structure of the mobile router 1 which concerns on one Embodiment of this invention. It is explanatory drawing which shows the structural example of the communication network system which concerns on one Embodiment of this invention. It is explanatory drawing which shows the structural example of the conventional communication network system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a mobile router 1 according to an embodiment of the present invention. FIG. 2 is an explanatory diagram showing a configuration example of the communication network system according to the embodiment. Hereinafter, the present embodiment will be described with reference to FIGS. 1 and 2.

  In FIG. 2, the mobile router 1 has WAN-side network interfaces IFa and IFb and a LAN-side network interface IFc, and performs routing between the WAN and the LAN. The mobile router 1 has a function of automatically switching the WAN to be connected according to the network state on the WAN side. For example, in the case of connection to the base station 201 of the LTE network, the connection is automatically switched to the base station 202 of the WiMAX network when communication between the base stations 201 occurs or when the quality measurement result is bad. As a result, since the network interface to be used is switched from the network interface IFa (IP address A) to the network interface IFb (IP address B) on the WAN side of the mobile router 1, the IP address changes. This is the same as the conventional mobile router 100 shown in FIG.

  In FIG. 1, a mobile router 1 includes a routing unit 10, an analysis unit 11, a management unit 12, a creation unit 13, and network interfaces IFa (IP address A), IFb (IP address B), and IFc (IP address C). The network interfaces IFa and IFb are WAN-side network interfaces, and the network interface IFc is a LAN-side network interface.

  The routing unit 10 routes IP packets (hereinafter referred to as packets).

  The analysis unit 11 captures a packet that flows between the routing unit 10 and the network interface IFa and a packet that flows between the routing unit 10 and the network interface IFb. Then, the analysis unit 11 analyzes the header information of the captured packet, and outputs packet analysis information S <b> 1 that is an analysis result to the management unit 12.

  The packet analysis information S1 related to the packet from the LAN side (terminal) to the WAN side (server that is the communication partner of the terminal) includes the IP address of the transmission source, the port number of the transmission source, and the network interface ( Identification information on the LAN side and WAN side) is included. The packet analysis information S1 regarding the packet from the WAN side (server which is the communication partner of the terminal) to the LAN side (terminal) includes the IP address of the transmission destination, the port number of the transmission destination, and the network interface ( Identification information on the LAN side and WAN side) is included.

  Based on the packet analysis information S1 received from the analysis unit 11, the management unit 12 records a network interface to be used for each terminal 2 (IP address) and for each session (port number). For example, a management table is provided, and the packet analysis information S1 information is organized and recorded in the management table.

  In addition, network switching information (NW switching information) is input to the management unit 12. The NW switching information is information for notifying that switching of the WAN to which the mobile router 1 is connected has occurred. Specifically, the NW switching information in FIG. 2 is information that notifies that switching of the base station to which the mobile router 1 is connected has occurred between the base station 201 of the LTE network and the base station 202 of the WiMAX network. is there. Alternatively, the NW switching information is information notifying that the session has expired. The NW switching information is notified to the management unit 12 from a device that measures the quality of each WAN and selects a good WAN, or a device that reconnects when a communication disconnection occurs.

  When receiving the NW switching information, the management unit 12 outputs the NW switching notification destination information S2 to the creating unit 13. The NW switching notification destination information S2 is information on the destination to which the NW switching notification message is transmitted, and the terminal 2 (IP address) and the session (port) that use the network interface of the WAN that has been switched notified by the NW switching information. Number). Based on its own record (for example, management table), the management unit 12 examines a set of the terminal 2 (IP address) and session (port number) that uses the network interface of the WAN in which switching has occurred.

  The creation unit 13 creates an NW switching notification message S3. The NW switching notification message S3 is a message for notifying that the switching of the WAN has occurred to the destination (IP address or a combination of the IP address and the port number) indicated by the NW switching notification destination information S2. .

  The creation unit 13 outputs the NW switching notification message S3 to the network interface IFc. As a result, the NW switching notification message S3 is transmitted to the destination terminal 2 via the network interface IFc.

  As described above, the creation unit 13 may return the NW switching notification message S3 when there is some access from the destination terminal 2, instead of distributing the NW switching notification message S3 by push type information ( Pull-type information distribution). However, when more immediacy is desired, it is preferable that the creation unit 13 distributes the NW switching notification message S3 as push-type information.

  Also, when the mobile router 1 converts the global IP address on the WAN side and the local IP address on the LAN side, the mobile router 1 corresponds to the terminal 2 based on the IP address conversion information. Add a function to obtain an IP address.

  Also, when the same terminal 2 (IP address) uses a different WAN (network interface) for each session (port number), NW switching notification is made with the pair of terminal 2 (IP address) and session (port number) as the destination. It is preferable to send message S3. However, the present invention is not limited to this, and the NW switching notification message S3 may be transmitted with at least the terminal 2 (IP address) as the destination.

  According to the embodiment described above, the terminal 2 can know that the switching of the WAN to be used has occurred by receiving the NW switching notification message S3. As a result, the terminal 2 can immediately re-establish the session without waiting for the timeout of its own communication request in response to the session disconnection of the session in communication. Is possible.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  For example, in the above-described embodiment, the terminal using the WAN network interface in which switching has occurred is the destination of the NW switching notification message. However, all terminals connected to the mobile router 1 may be the destination of the NW switching notification message. In this case, the packet analysis information only needs to indicate at least the IP address corresponding to the terminal. Then, the management unit 12 outputs the IP address corresponding to the terminal included in the packet analysis information record as the NW switching notification destination information S2.

  In the above-described embodiment, the mobile router is exemplified as an example of the network switching device. However, the present invention is not limited to the mobile router, and can be applied to various network switching devices.

Further, by recording a program for realizing the function of each unit shown in FIG. 1 on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium, network switching information is obtained. Notification processing may be performed. Here, the “computer system” may include an OS and hardware such as peripheral devices.
“Computer-readable recording medium” refers to a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disk), and a built-in computer system. A storage device such as a hard disk.

Further, the “computer-readable recording medium” means a volatile memory (for example, DRAM (Dynamic DRAM) in a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory)), etc., which hold programs for a certain period of time.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Mobile router (network switching apparatus), 10 ... Routing part, 11 ... Analysis part (Network switching information notification apparatus), 12 ... Management part (Network switching information notification apparatus), 13 ... Creation part (Network switching information notification apparatus) , IFa, IFb, IFc ... Network interface

Claims (5)

A network switching information notification device in a network switching device having a first network interface on a terminal side and a plurality of second network interfaces that input and output IP packets between the first network interface;
Analyzing an IP packet input / output to / from each network interface, and outputting a packet analysis information indicating an IP address corresponding to the terminal related to the analyzed IP packet;
When the packet analysis information is recorded and network switching information is input, a management unit that acquires and outputs an IP address corresponding to the terminal from the record;
A creation unit for creating a network switching notification message destined for the IP address output from the management unit,
Causing the network switch notification message to be transmitted from the first network interface;
A network switching information notification device characterized by the above. The analysis unit outputs, as the packet analysis information, an IP address corresponding to the terminal related to the analyzed IP packet and identification information of the second network interface to be used,
The management unit acquires and outputs an IP address corresponding to the terminal that uses the second network interface in which switching has occurred based on the network switching information from the record.
The network switching information notification device according to claim 1. The analysis unit outputs, as the packet analysis information, an IP address and a port number corresponding to the terminal related to the analyzed IP packet and identification information of the second network interface to be used,
The management unit acquires and outputs an IP address and a port number corresponding to the terminal that uses the second network interface in which switching has occurred based on the network switching information from the record,
The creation unit creates a network switching notification message destined for the IP address and port number output from the management unit;
The network switching information notification device according to claim 1.   4. The network switching information notification device according to claim 1, wherein the network switching notification message is distributed as push-type information from the first network interface. 5. A computer for performing network switching information notification processing in a network switching device having a first network interface on the terminal side and a plurality of second network interfaces that input and output IP packets between the first network interface A program,
Analyzing an IP packet input / output to / from each network interface, and outputting packet analysis information indicating an IP address corresponding to the terminal;
A management step of recording the packet analysis information and obtaining and outputting an IP address corresponding to the terminal from the record when network switching information is input;
A creation step of creating a network switching notification message destined for the IP address output from the management step;
Transmitting the network switching notification message from the first network interface;
A computer program for causing a computer to execute.

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