JP2014183332A - Information processing device, multicast distribution system, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress multicast distribution having erroneous setting.SOLUTION: A storage unit 1a stores information showing whether or not a combination of a transmission source address and destination multicast address is permitted. A calculation unit 1b acquires information showing a combination of a transmission source address and destination multicast address from a relay device 2, when the information is registered to the relay device 2 which operates as a rendezvous point. When referring to the storage unit 1a and detecting that the combination is not permitted, the calculation unit 1b controls the relay device 2 so as not to transfer a packet from the transmission source address to the destination multicast address.

Description

  The present invention relates to an information processing apparatus, a multicast distribution system, and a program.

  Currently, a multicast distribution system that distributes data transmitted by a transmission source apparatus to a plurality of apparatuses is used. In multicast, the same data can be distributed to a plurality of devices belonging to one multicast group. A multicast group is identified by address information called a multicast address. For example, as a multicast method, there is PIM-SM (Protocol Independent Multicast-Sparse Mode).

  In PIM-SM, a relay device called a rendezvous point (RP) is provided in a network to which a source device (sometimes called a source) and a destination device (sometimes called a receiver) are connected. . The RP is associated with a multicast group. When the source starts data distribution, the RP receives a message called a PIM register message from a multicast-compatible relay device (FHR: First Hop Router) that relays data transmitted by the source first. The PIM register message is a message for causing the RP to register information indicating the correspondence relationship between the source address, the multicast address, and the multicast data transfer destination interface. Thereafter, when the RP receives data addressed to the multicast address from the registered source, the RP transfers the data to the receiver belonging to the multicast group corresponding to the address based on the registered information.

  Here, for example, there is a proposal of a multicast session management apparatus that receives a data flow transmitted by a server. The multicast session management device converts the destination address of the data flow into a multicast address, and proxy-transmits the converted data flow on the network. In this proposal, it is considered to select and assign a multicast address different from the multicast address in use at the time of address conversion.

JP 2000-244488 A JP 2009-194666 A JP 2005-143057 A JP 2006-148654 A Japanese Patent Laid-Open No. 2004-40804

  Before multicast distribution, a user may set a destination multicast address as a source. In this case, misconfiguration of the multicast address becomes a problem. For example, the same multicast address may be set redundantly for a plurality of sources. When each source starts distribution, the RP distributes different data received from different sources to receivers belonging to the same multicast group. When different data sent from a different source is input to a predetermined function on the receiver side (for example, video or audio playback), the function cannot be properly processed and the use of the function is interrupted. There is a fear.

  In one aspect, an object of the present invention is to provide an information processing apparatus, a multicast distribution system, and a program that can suppress multicast distribution due to erroneous settings.

  In one aspect, an information processing apparatus is provided. The information processing apparatus includes a storage unit and a calculation unit. The storage unit stores information indicating whether a combination of a source address and a destination multicast address is permitted. When information indicating a combination of a source address and a destination multicast address is registered in a relay device that operates as a rendezvous point, the arithmetic unit acquires information indicating the combination from the relay device and refers to the storage unit When it is detected that the combination is not allowed, the relay apparatus is controlled so as not to transfer data including the transmission source address and the destination multicast address.

  In one aspect, a multicast distribution system including a plurality of relay devices that transfer data is provided. This multicast distribution system has an information processing apparatus. When information indicating a combination of a source address and a destination multicast address is registered in a relay device that operates as a rendezvous point, the information processing device acquires information indicating the combination from the relay device, and the combination is When it is detected that the combination is not permitted with reference to the information indicating whether or not the combination is permitted, the relay apparatus is controlled not to transfer the data including the source address and the destination multicast address. To do.

  In one aspect, a program executed by a computer is provided. When information indicating a combination of a source address and a destination multicast address is registered in a relay device that operates as a rendezvous point, the program acquires information indicating the combination from the relay device, and transmits the source address And when it is detected that the combination acquired from the relay device is not permitted, with reference to the information indicating whether the combination of the destination multicast address is permitted or not, the multicast of the source address and the destination The computer is caused to execute a process for controlling the relay apparatus so as not to transfer the data including the address.

  In one aspect, an information processing apparatus is provided. This information processing apparatus includes a storage unit and a calculation unit. The storage unit stores information indicating whether a combination of a source address and a destination multicast address is permitted. When information indicating a combination of a source address and a destination multicast address is registered in a relay device that operates as a rendezvous point, the arithmetic unit acquires information indicating the combination from the relay device and refers to the storage unit If it is detected that the combination is not permitted, the apparatus corresponding to the source address is controlled so as to stop transmission of data to the destination multicast address.

  In one aspect, multicast distribution due to misconfiguration can be suppressed.

It is a figure which shows the multicast delivery system of 1st Embodiment. It is a figure which shows the multicast delivery system of 2nd Embodiment. It is a figure which shows the hardware example of the management server of 2nd Embodiment. It is a figure which shows the example of software of 2nd Embodiment. It is a figure which shows the example of the address information history table of 2nd Embodiment. It is a figure which shows the example of the routing table of 2nd Embodiment. It is a flowchart which shows the process example of RP router of 2nd Embodiment. It is a flowchart which shows the process example of the management server of 2nd Embodiment. It is a sequence diagram which shows the process example of 2nd Embodiment. It is a sequence diagram which shows the other process example of 2nd Embodiment. It is a figure which shows the example of the address information table of 3rd Embodiment. It is a flowchart which shows the process example of RP router of 3rd Embodiment. It is a flowchart which shows the example of a process of the management server of 3rd Embodiment.

Hereinafter, the present embodiment will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a diagram illustrating a multicast distribution system according to the first embodiment. The multicast distribution system according to the first embodiment includes an information processing device 1, relay devices 2, 3, 3a, 3b, 3c, transmission devices 4, 4a, and reception devices 5, 5a. The relay devices 2, 3, 3a, 3b, 3c transfer data between the transmission devices 4, 4a and the reception devices 5, 5a. The transferred data may be called a packet or an IP (Internet Protocol) packet. A packet distributed by multicast is sometimes called a multicast packet.

  The multicast distribution system of the first embodiment uses PIM-SM for multicast distribution. The relay device 2 operates as an RP in the PIM-SM. The relay device 2 may be called an RP router. The relay device 3 is an FHR for the transmission device 4. The relay device 3a is an FHR for the transmission device 4a. The relay device 3 b is an LHR (Last Hop Router) for the receiving device 5. The relay device 3c is an LHR for the receiving device 5a.

  The information processing apparatus 1 includes a storage unit 1a and a calculation unit 1b. The storage unit 1a may be a memory such as a RAM (Random Access Memory). The calculation unit 1b may be a processor such as a CPU (Central Processing Unit). The information processing of the first embodiment may be realized by the calculation unit 1b executing the program stored in the storage unit 1a.

  The storage unit 1a stores information indicating whether a combination of a source address and a destination multicast address is permitted. The information may be generated by the calculation unit 1b based on information held by the relay device 2, or may be stored in advance in the storage unit 1a by a user or the like.

  Here, for example, the address of the transmission device 4 is the address A. The address of the transmission device 4a is address B. The receiving devices 5 and 5a belong to the multicast group corresponding to the multicast address C. Each address may be an IP address used in IPv4 (Internet Protocol version 4) or IPv6 (Internet Protocol version 6).

  When the information indicating the combination of the transmission source address and the destination multicast address is registered in the relay device 2 operating as the RP, the calculation unit 1b acquires the information indicating the combination from the relay device 2. When the arithmetic unit 1b refers to the information stored in the storage unit 1a and detects that the combination is not permitted, the arithmetic unit 1b relays the data including the source address and the destination multicast address so as not to transfer the data. The apparatus 2 is controlled.

  For example, it is assumed that multicast distribution is performed from the transmission device 4 to the reception devices 5 and 5a. In this case, the relay device 3 transmits a PIM register message to the relay device 2 when the transmission device 4 starts multicast distribution. Therefore, the relay device 2 holds information indicating the address A, the multicast address C, and the multicast data transfer destination interface. Here, this information may be referred to as (S (Source), G (Group)) entry. The (S, G) entry is one of the entries in the multicast routing table held by the relay device 2 that is the RP.

  The calculation unit 1b acquires information on the newly registered (S, G) entry from the relay device 2, and stores information indicating the history of the registered (S, G) entry in the storage unit 1a. Good. Information indicating the history may be used as information indicating whether a combination of the source address and the destination multicast address is permitted. For example, when an (S, G) entry including a multicast address in use is registered in the relay device 2, the calculation unit 1b includes the address of the transmission source included in the (S, G) entry registered later, and It is determined that the destination multicast address combination is not allowed. This is to prioritize the existing multicast distribution and prevent the existing distribution service from being interrupted.

  For example, when multicast distribution is started from the transmission device 4a to the reception devices 5 and 5a, the relay device 3a transmits a PIM register message to the relay device 2. However, the (S, G) entry including the multicast address C (with the address A as the transmission source) has already been registered in the relay device 2. At this time, the arithmetic unit 1b acquires the combination of the address B and the multicast address C from the relay device 2. Based on the history stored in the storage unit 1a and the information acquired from the relay device 2, the calculation unit 1b has registered (S, G) entries including the multicast address C in the relay device 2 in duplicate. Is detected. For example, the computing unit 1b detects a combination of a source address B and a destination multicast address C corresponding to an (S, G) entry registered later as an unacceptable combination.

  Alternatively, information indicating only a combination that is permitted as a combination of a source address and a destination multicast address may be stored in the storage unit 1a in advance. More specifically, information indicating that the combination of the source address A and the destination multicast address C is permitted is stored in the storage unit 1a in advance. Alternatively, information indicating only a combination that is not permitted as a combination of the source address and the destination multicast address may be stored in the storage unit 1a in advance. More specifically, information indicating that the combination of the source address B and the destination multicast address C is not allowed is stored in the storage unit 1a in advance. In any case, the calculation unit 1b can determine whether or not the (S, G) entry newly registered in the relay device 2 is permitted based on the information stored in the storage unit 1a. .

  For example, it is assumed that the arithmetic unit 1b detects that the combination of the address B and the multicast address C is not permitted. Then, the arithmetic unit 1b controls the relay device 2 so as not to perform the multicast distribution by the (S, G) entry including the combination of the address B and the multicast address C. For example, the calculation unit 1b may instruct the relay device 2 to delete the (S, G) entry. This is because if the (S, G) entry is deleted, transfer of the corresponding multicast data by the relay device 2 can be suppressed. Alternatively, the calculation unit 1b may cause the transmission device 4a (device corresponding to the address B) to stop transmitting multicast data.

  According to the information processing apparatus 1, when information indicating the combination of the source address B and the destination multicast address C is registered in the relay apparatus 2 operating as the RP by the calculation unit 1b, information indicating the combination is displayed. Obtained from the relay device 2. When the computing unit 1b refers to the storage unit 1a and detects that the combination is not permitted, the relay device 2 prevents the data including the source address B and the destination multicast address C from being transferred. Be controlled. Thereby, even if the destination multicast address C is erroneously set in the transmission device 4a, multicast distribution due to erroneous setting can be suppressed. Specifically, it is as follows.

  A destination multicast address may be set as a source before multicast distribution. The system administrator may perform the setting work. In this case, misconfiguration of the multicast address becomes a problem. For example, the same multicast address may be set redundantly for a plurality of sources. When each source starts distribution, different data transmitted by different sources can be redundantly distributed by the RP to receivers belonging to the same multicast group.

  Therefore, the information processing apparatus 1 manages a combination of a transmission source address and a destination multicast address registered in the relay apparatus 2. Using the information processing apparatus 1, the relay apparatus 2 is controlled so as to stop multicast distribution by a combination that is not permitted. Thereby, even if the destination multicast address is erroneously set in the transmission device (for example, the transmission device 4a), it is possible to prevent multicast distribution from being performed with the erroneous setting.

  In particular, the information processing apparatus 1 acquires information registered in the relay apparatus 2 that operates as an RP, and determines whether a combination of a transmission source and a destination is permitted. For example, it is conceivable to collect and analyze data flowing through the network at any part of the network. However, in this case, the processing cost for searching for data to be multicast distributed from the collected data becomes a problem. This is because a large amount of data by various communications can be flowed through the network. On the other hand, since the information processing apparatus 1 does not need to analyze a large amount of data in this way, it can efficiently determine whether a combination of a transmission source and a destination is permitted.

  Further, the information processing apparatus 1 controls the relay apparatus 2 so as to stop the multicast distribution that is not permitted. For this reason, unacceptable multicast distribution can be quickly stopped. For example, if the multicast distribution continues to be received by the receiving devices 5 and 5a until the system administrator corrects the misconfiguration of the transmitting device 4a, the receiving device 5 and 5a correctly receives the multicast distribution with the correct settings by the transmitting device 4. It may not be possible. This effect is particularly serious for content that is distributed in real time, such as surveillance video. For example, there is a possibility that the supervisor may miss an image at an important time. According to the information processing apparatus 1, since multicast distribution that is not permitted can be stopped quickly, the influence on multicast distribution with a correct setting can be reduced.

[Second Embodiment]
FIG. 2 is a diagram illustrating a multicast distribution system according to the second embodiment. The multicast distribution system according to the second embodiment includes a management server 100, routers 200, 300, 300a, 300b, and 300c, monitoring cameras 400 and 400a, and clients 500, 500a, 500b, and 500c. The routers 200, 300, and 300a are connected via the network 10. The routers 200 and 300b are connected via the network 20. The routers 200 and 300c are connected via the network 30. The networks 10, 20, and 30 may be a LAN (Local Area Network) or a wide area network such as a WAN (Wide Area Network) or the Internet. In the multicast distribution system of the second embodiment, PIM-SM is used.

  The management server 100 is a server computer that monitors the routing of multicast packets by the router 200. Further, the management server 100 controls the routing by the router 200 according to the event detected by monitoring.

  The routers 200, 300, 300a, 300b, and 300c are multicast compatible relay devices that route multicast packets. The router 200 operates as an RP router for a certain multicast group.

  The monitoring cameras 400 and 400a are imaging devices that continuously capture a region to be monitored and distribute a moving image by multicast. For example, the monitoring cameras 400 and 400a are provided in the vicinity of rivers, roads, and buildings that are to be monitored. An apparatus that is a transmission source of a multicast packet, such as the monitoring cameras 400 and 400a, may be referred to as a multicast source or simply a source. The monitoring camera 400 is connected to the router 300. The monitoring camera 400a is connected to the router 300a.

  Clients 500, 500a, 500b, and 500c are client computers used by users. The user can browse the monitoring moving images distributed by the monitoring cameras 400 and 400a by operating the clients 500, 500a, 500b, and 500c. Devices that are multicast packet destinations such as clients 500, 500a, 500b, and 500c may be referred to as multicast receivers or simply receivers.

  For example, when a monitoring moving image captured by the monitoring camera 400 is to be distributed to a certain multicast group, the user sets the multicast address of the multicast group in the monitoring camera 400. For example, the user can access the monitoring camera 400 from the client 500 using Telnet or the like and set a multicast address.

  Here, for example, in IPv4 or IPv6, a combination of a predetermined prefix and an ID (IDentifier) for identifying a multicast group is used as a multicast address. In the following, the case of using IPv4 is exemplified, but the information processing of the second embodiment can also be applied when using IPv6. In this case, the IPv4 IP address may be replaced with the IPv6 IP address.

  In IPv4, a range called class D in the address range is used as the multicast address. The class D prefix is “1110”. The class D address range is “224.0.0.0” to “239.255.255.255”.

  In the following description, as an example, the multicast address of the first multicast group to which the clients 500 and 500a belong is “239.1.1.1”. The multicast address of the second multicast group to which the clients 500b and 500c belong is set to “239.1.1.2”. In addition, the IP address of the monitoring camera 400 is set to “10.1.1.1”. The IP address of the monitoring camera 400a is set to “10.1.2.2”. When it is desired to point to a multicast address among IP addresses, it is specified as a multicast address. Assume that the router 200 operates as an RP router for the first multicast group.

  A multicast packet transmitted by the monitoring camera 400 first passes through the router 300 as a multicast-compatible router. In this case, the router 300 is an FHR for the monitoring camera 400. Similarly, the router 300a is an FHR for the monitoring camera 400a. The multicast packet received by the clients 500 and 500a finally passes through the router 300b as a multicast compatible router. In this case, the router 300b is an LHR for the clients 500 and 500a. Similarly, the router 300c is an LHR for the clients 500b and 500c.

  In multicast, a multicast packet transmitted by a source reaches a receiver via FHR, RP router, and LHR in this order. At this time, the routers from the FHR to immediately before the RP router transfer the multicast packet toward the RP router corresponding to the multicast address included in the multicast packet. A route from the FHR to the RP router may be called a transmission source tree. The route from the RP router to the LHR is sometimes called a shared tree.

  In the second embodiment, the case where the monitoring cameras 400 and 400a are used as the source is illustrated, but this does not prevent other devices from being used as the source. For example, a server computer that stream-distributes content such as a predetermined moving image or sound by multicast may be used as a source.

  FIG. 3 is a diagram illustrating a hardware example of the management server according to the second embodiment. The management server 100 includes a processor 101, a RAM 102, an HDD (Hard Disk Drive) 103, a communication unit 104, an image signal processing unit 105, an input signal processing unit 106, a disk drive 107, and a device connection unit 108. Each unit is connected to the bus of the management server 100.

  The processor 101 controls information processing of the management server 100. The processor 101 may be a multiprocessor. The processor 101 is, for example, a CPU, a micro processing unit (MPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or a programmable logic device (PLD). The processor 101 may be a combination of two or more elements among CPU, MPU, DSP, ASIC, FPGA, and PLD.

  The RAM 102 is a main storage device of the management server 100. The RAM 102 temporarily stores at least part of an OS (Operating System) program and application programs to be executed by the processor 101. The RAM 102 stores various data used for processing by the processor 101.

  The HDD 103 is an auxiliary storage device of the management server 100. The HDD 103 magnetically writes data to and reads data from a built-in magnetic disk. The HDD 103 stores an OS program, application programs, and various data. The management server 100 may include other types of auxiliary storage devices such as flash memory and SSD (Solid State Drive), or may include a plurality of auxiliary storage devices.

  The communication unit 104 is an interface that can communicate with other computers via the network 10. The communication unit 104 may be a wired interface or a wireless interface.

  The image signal processing unit 105 outputs an image to the display 11 connected to the management server 100 in accordance with an instruction from the processor 101. As the display 11, a CRT (Cathode Ray Tube) display, a liquid crystal display, or the like can be used.

  The input signal processing unit 106 acquires an input signal from the input device 12 connected to the management server 100 and outputs the input signal to the processor 101. As the input device 12, for example, a pointing device such as a mouse or a touch panel, a keyboard, or the like can be used.

  The disk drive 107 is a drive device that reads a program and data recorded on the optical disk 13 using a laser beam or the like. As the optical disc 13, for example, a DVD (Digital Versatile Disc), a DVD-RAM, a CD-ROM (Compact Disc Read Only Memory), a CD-R (Recordable) / RW (ReWritable), or the like can be used. For example, the disk drive 107 stores the program and data read from the optical disk 13 in the RAM 102 or the HDD 103 in accordance with an instruction from the processor 101.

  The device connection unit 108 is a communication interface for connecting peripheral devices to the management server 100. For example, the memory device 14 and the reader / writer device 15 can be connected to the device connection unit 108. The memory device 14 is a recording medium equipped with a communication function with the device connection unit 108. The reader / writer device 15 is a device that writes data to the memory card 16 or reads data from the memory card 16. The memory card 16 is a card-type recording medium. For example, the device connection unit 108 stores a program or data read from the memory device 14 or the memory card 16 in the RAM 102 or the HDD 103 in accordance with an instruction from the processor 101.

  FIG. 4 is a diagram illustrating an example of software according to the second embodiment. In FIG. 4, a router and a network between the monitoring camera 400 and the router 200 and between the router 200 and the client 500 are not shown. In FIG. 4, the monitoring camera 400a and the clients 500a, 500b, and 500c are not shown. All or a part of the units shown in FIG. 4 may be realized by executing a program stored in a memory such as a RAM by each processor included in the management server 100, the router 200, the monitoring camera 400, and the client 500. The management server 100 includes a storage unit 110 and a management unit 120.

  The storage unit 110 stores an address information history table. The address information history table is information in which a history of a predetermined entry registered in the routing table held by the router 200 is recorded.

  The management unit 120 monitors the registered contents of the routing table held by the router 200. Specifically, the management unit 120 acquires information on the entry newly added to the routing table and registers it in the address information history table stored in the storage unit 110. In addition, the management unit 120 refers to the address information history table and detects an erroneous entry. Then, the management unit 120 performs control for stopping multicast packet distribution. The management unit 120 may communicate with the monitoring camera 400 and control the operation of the monitoring camera 400.

  The router 200 includes a storage unit 210 and a relay processing unit 220. The storage unit 210 stores a routing table. The routing table is updated by the relay processing unit 220.

  The relay processing unit 220 performs multicast packet routing based on the routing table stored in the storage unit 210. The routing table includes information called (S, G) entries. The (S, G) entry is for communication provided in the router 200 in a combination of a source IP address (corresponding to “S”) as a source and a multicast address (corresponding to “G”) of a multicast group as a destination. This is information in which identification information of an interface (communication port to be transmitted) is associated.

  That is, the relay processing unit 220 can perform multicast packet routing as follows. The router 200 is an RP router corresponding to the first multicast group (address “239.1.1.1”). Therefore, each router in the transmission source tree forwards the multicast packet including the multicast address “239.1.1.1” as the destination address to the router 200. The relay processing unit 220 receives a multicast packet.

  The relay processing unit 220 acquires the source IP address and the destination multicast address included in the multicast packet. The relay processing unit 220 searches the routing table for an (S, G) entry including the acquired combination of addresses. The relay processing unit 220 transmits the multicast packet from the communication interface included in the searched (S, G) entry. The multicast packet reaches the receiver via the shared tree corresponding to the multicast group.

When the relay processing unit 220 receives a control message called a PIM register message generated by the FHR, the relay processing unit 220 registers an (S, G) entry in the routing table.
Here, in the PIM-SM, when the FHR receives a multicast packet started to be transmitted by the source, the FHR encapsulates the packet into a unicast packet to generate a PIM register message. The PIM register message includes the source IP address and the destination multicast address. In the FHR, the IP address of the RP router corresponding to the multicast address is registered in advance. The FHR transmits the PIM register message to the RP router by unicast. The RP router generates an (S, G) entry based on the PIM register message. Specifically, the (S, G) entry can be generated based on the (*, G) entry and the source IP address. The (*, G) entry is shared tree information, and is information in which a multicast address is associated with identification information of a communication interface (communication port to be transmitted) included in each router. The (*, G) entry is generated in advance in the router belonging to the shared tree.

  The surveillance camera 400 has an encoder 410. The encoder 410 converts (encodes) the monitoring video captured by the monitoring camera 400 into a predetermined data format, thereby generating streaming delivery data. The encoder 410 generates a multicast packet based on the data for streaming distribution and distributes it to a predetermined multicast group. For example, the multicast address of the delivery destination is set in advance in the encoder 410 by the user. Here, the software example of the monitoring camera 400 a is the same as that of the monitoring camera 400.

  The client 500 has a decoder 510. The decoder 510 receives the multicast packet and acquires data for streaming distribution. The decoder 510 decodes the data for streaming delivery and outputs a monitoring video. For example, the decoder 510 displays the monitoring video on a display connected to the client 500. Software examples of the clients 500a, 500b, and 500c are the same as those of the client 500.

  FIG. 5 is a diagram illustrating an example of an address information history table according to the second embodiment. The address information history table 111 is stored in the storage unit 110. The address information history table 111 includes items of item number, time, source address, and destination multicast address.

  In the item number item, a number for identifying the record is registered. In the time item, the time when the notification that the (S, G) entry is registered in the routing table is received from the router 200 is registered. For example, the time is in the format of year / month / day / hour / minute / second. In the transmission source address item, the transmission source address included in the (S, G) entry is registered. In the destination multicast address item, the destination multicast address included in the (S, G) entry is registered.

  For example, in the address information history table 111, the item number is “1”, the time is “2013/1/15 10:38:21”, the source address is “10.1.1.1”, and the destination multicast address is Information “239.1.1.1” is registered. This is a notification that the (S, G) entry of (S, G) = (“10.1.1.1”, “239.1.1.1”) has been registered in the routing table, Shown on January 15, 2013 at 10:38:21.

  FIG. 6 is a diagram illustrating an example of a routing table according to the second embodiment. The routing table 211 is stored in the storage unit 210. The routing table 211 includes items of a multicast source name and (S, G) entry.

  In the item of multicast source name, the name of the source is registered. For example, the name of the monitoring camera 400 is “monitoring camera A”. The name of the monitoring camera 400a is “monitoring camera B”. The (S, G) entry is registered in the (S, G) entry item. The (S, G) entry includes items of a source address, a destination multicast address, and an output IF (InterFace). The source IP address is registered in the source address field. The destination multicast address is registered in the destination multicast address item. In the output IF item, identification information of a communication interface (communication port to be transmitted) included in the router 200 is registered.

  For example, in the routing table 211, the multicast source name is “monitoring camera A”, the (S, G) entry is the transmission source address “10.1.1.1”, and the destination multicast address “239.1.1.1”. ", The output IF" IF1 "is registered. This is because, when the router 200 receives a multicast packet addressed to “239.1.1.1” from the transmission source “239.1.1.1”, among the plurality of communication interfaces provided in the router 200, “ This indicates that the multicast packet should be transmitted from the interface indicated by IF1 ″.

  Here, the routing table 211 exemplifies a state in which multicast distribution is performed from the monitoring cameras 400 and 400a with the same destination multicast address. For example, it is considered that the user has mistakenly set the same destination multicast address as the monitoring camera 400 for the monitoring camera 400a. For example, in this case, the decoder 510 receives different multicast packets distributed by the monitoring cameras 400 and 400a in duplicate. Then, the decoder 510 cannot appropriately decode. As a result, the user of the client 500 may not be able to view any of the monitoring videos distributed by the monitoring cameras 400 and 400a.

FIG. 7 is a flowchart illustrating a processing example of the RP router according to the second embodiment. In the following, the process illustrated in FIG. 7 will be described along with step numbers.
(Step S11) The relay processing unit 220 receives the PIM register message. For example, the PIM register message may be generated by the router 300 and transmitted to the router 200 when multicast distribution is performed by the monitoring camera 400. Alternatively, for example, the PIM register message may be generated by the router 300a and transmitted to the router 200 when multicast distribution is performed by the monitoring camera 400a.

  (Step S12) The relay processing unit 220 registers the (S, G) entry in the routing table 211 stored in the storage unit 210 based on the PIM register message and the (*, G) entry.

(Step S13) The relay processing unit 220 notifies the management server 100 of information on the newly registered (S, G) entry.
(Step S <b> 14) The relay processing unit 220 determines whether or not (S, G) entries having duplicate destination multicast addresses exist in the routing table 211. If it exists, the process proceeds to step S15. If it does not exist, the process ends. For example, in the example of the routing table 211 described with reference to FIG. 6, (S, G) entries having a duplicate destination multicast address “239.1.1.1” are registered. In this case, the relay processing unit 220 proceeds with the process to step S15.

  (Step S15) The relay processing unit 220 inquires of the management server 100 about the contents of the erroneously set (S, G) entry. The inquiry includes information on (S, G) entries with overlapping destinations.

  (Step S <b> 16) The relay processing unit 220 receives information on an erroneously set (S, G) entry from the management server 100. As will be described later, the management server 100 determines that the (S, G) entry registered later among the (S, G) entries with the duplicated destination is an erroneous setting. In the example of the routing table 211 described with reference to FIG. 6, the erroneously set (S, G) entry is the (S, G) entry of the monitoring camera 400a (“monitoring camera B”).

  (Step S <b> 17) The relay processing unit 220 deletes the (S, G) entry designated from the management server 100 from the routing table 211. For example, the relay processing unit 220 deletes the (S, G) entry of the monitoring camera 400a.

  As described above, the relay processing unit 220 inquires the management server 100 about an erroneously set (S, G) entry and deletes the erroneously set (S, G) entry. Then, the relay processing unit 220 does not transfer the multicast packet transmitted by the monitoring camera 400a. This is because even if the multicast packet is received, the communication interface to be transmitted cannot be determined.

FIG. 8 is a flowchart illustrating a processing example of the management server according to the second embodiment. In the following, the process illustrated in FIG. 8 will be described in order of step number.
(Step S21) The management unit 120 receives information on (S, G) entries newly registered in the router 200, which is an RP router. The information of the (S, G) entry is included in the notification in step S13 in FIG.

  (Step S22) The management unit 120 registers the received (S, G) entry information in the address information history table 111 stored in the storage unit 110. For example, if newly registered (S, G) = (“10.1.1.1”, “239.1.1.1”), the source address of the address information history table is “10. “1.1.1” is set to “239.1.1.1” as the destination multicast address. In addition, the management unit 120 assigns a time stamp indicating the time when the information in step S21 is received to the record (registers it in the time item).

  (Step S <b> 23) The management unit 120 determines whether an inquiry about an erroneously set (S, G) entry has been received from the router 200. If received, the process proceeds to step S24. If not received, the process is terminated. The inquiry corresponds to the inquiry described in step S15 of FIG.

  (Step S24) The management unit 120 identifies an erroneously set (S, G) entry (an entry that is not allowed) based on the address information history table 111. In the address information history table 111, a registration history of (S, G) entries included in the routing table 211 is recorded together with a time stamp. The management unit 120 determines that the (S, G) entry registered later among the (S, G) entries having the same destination multicast address is an erroneously set (S, G) entry. Identify. In the example of the address information history table 111 in FIG. 5, the records of item numbers “1” and “2” have duplicate destination multicast addresses. According to the setting of the time item, the record of item number “2” is registered after the record of item number “1”. Therefore, the management unit 120 specifies that the (S, G) entry corresponding to the item number “2” is erroneously set.

(Step S25) The management unit 120 notifies the router 200 of information on the (S, G) entry that has been incorrectly set.
(Step S <b> 26) The management unit 120 refers to the address information history table 111 and obtains the IP address of the source that is performing multicast distribution due to misconfiguration. In the example of the address information history table 111 in FIG. 5, the IP address “10.1.2.2” of the monitoring camera 400a. The management unit 120 instructs the source (for example, the monitoring camera 400a) to stop delivery of multicast packets. For example, when receiving the instruction, the encoder of the monitoring camera 400a stops the delivery of the multicast packet.

  In this way, the management server 100 manages the history of (S, G) entries registered in the routing table 211 of the router 200 that is an RP router. Here, when the (S, G) entry is deleted from the routing table 211, the management server 100 receives a notification to that effect from the router 200. The management server 100 deletes the entry on the address information history table 111 corresponding to the (S, G) entry. Thereby, the registered contents of the routing table 211 and the address information history table 111 can be synchronized. In response to the inquiry from the router 200, the management server 100 provides the management server 100 with information on the (S, G) entry that has been misconfigured.

  That is, the address information history table 111 is information indicating whether or not the (S, G) entry (combination of the transmission source address and the destination multicast address) is allowed to be registered in the router 200 operating as the RP router. It can be said that there is.

  In addition, the management unit 120 instructs the source that performs distribution to the erroneously set destination multicast address to stop multicast distribution. This is because the load on the network can be reduced by suppressing the transmission of extra multicast packets. Note that the order of steps S25 and S26 may be reversed. That is, step S25 may be executed after step S26.

  FIG. 9 is a sequence diagram illustrating a processing example of the second exemplary embodiment. In the following, the process illustrated in FIG. 9 will be described in order of step number. In the following description, multicast may be abbreviated as MC (Multi Cast) in the drawings. Further, S1 = “10.1.1.1”, S2 = “10.1.2.2”, G1 = “239.1.1.1”, G2 = “239.1.1.2” is there.

  (Step ST101) The monitoring camera 400 starts distributing a multicast packet whose destination is the multicast address G1. The router 300 receives a multicast packet. Thereafter, the monitoring camera 400 continuously transmits multicast packets destined for the multicast address G1 (illustration of the subsequent transmission steps is omitted).

  (Step ST102) The router 300 generates a PIM register message based on the multicast packet. The router 300 transmits a PIM register message to the router 200 that is an RP router for the multicast address G1. The router 200 receives the PIM register message. The router 200 registers an entry of (S, G) = (S1, G1) in the routing table 211.

  (Step ST103) The router 200 notifies the management server 100 that the entry of (S, G) = (S1, G1) has been registered in the routing table 211. The management server 100 registers a record indicating (S1, G1) together with the time stamp in the address information history table 111.

  (Step ST104) The monitoring camera 400a starts distributing multicast packets destined for the multicast address G1. The router 300a receives a multicast packet. Thereafter, the monitoring camera 400a continuously transmits multicast packets destined for the multicast address G1 (illustration of subsequent transmission steps is omitted).

  (Step ST105) The router 300a generates a PIM register message based on the multicast packet. The router 300a transmits a PIM register message to the router 200 that is an RP router for the multicast address G1. The router 200 receives the PIM register message. The router 200 registers the entry (S, G) = (S2, G1) in the routing table 211.

  (Step ST106) The router 200 notifies the management server 100 that the entry of (S, G) = (S2, G1) has been registered in the routing table 211. The management server 100 registers a record indicating (S2, G1) together with the time stamp in the address information history table 111.

  (Step ST107) The router 200 detects that two entries (S1, G1) and (S2, G1) with duplicate destination multicast addresses are registered in the routing table 211. The router 200 inquires the management server 100 about an erroneously set (S, G) entry.

  (Step ST108) The management server 100 refers to the address information history table 111 in response to the inquiry, and specifies that (S2, G1) registered later among the entries with duplicate destination multicast addresses is an erroneous setting. To do. The management server 100 notifies the router 200 that (S2, G1) is an erroneous setting. The router 200 receives the notification.

  (Step ST109) The router 200 deletes the (S, G) entry corresponding to the notified (S2, G1) from the routing table 211. Thereafter, the multicast packet whose source is the monitoring camera 400a is not transferred to the shared tree side beyond the router 200.

  (Step ST110) The management server 100 instructs the monitoring camera 400a to stop transmission of multicast packets destined for the multicast address G1. In response to the instruction, the monitoring camera 400a stops transmission of the multicast address G1.

  For example, while the monitoring camera 400 is performing multicast distribution with the multicast address G1 as the destination as described above, the monitoring camera 400a may start multicast distribution with the multicast address G1 as the destination. If this state is left as it is, multicast packets distributed separately by the monitoring cameras 400 and 400a are repeatedly input to the decoders of the clients 500 and 500a. Then, appropriate processing cannot be performed by each decoder of the clients 500 and 500a, and monitoring using the monitoring camera 400 may be interrupted.

  Therefore, the management server 100 controls the router 200 so as not to forward the multicast packet registered later in the routing table 211 for the multicast packet having the duplicate destination multicast address. The reason why the multicast packet is stopped due to the erroneous setting of the one registered later is to allow the existing monitoring by the monitoring camera 400 to be continued. As a result, it is possible to prevent duplicate delivery from being performed with incorrect settings.

  In particular, the management server 100 acquires information of the routing table 211 held by the router 200 that operates as an RP router, and uses it for detection of misconfiguration. Here, for example, it is conceivable to collect and analyze various data flowing through the network at any part of the network (this method is sometimes called packet capture). However, in packet capture, the processing cost for searching for data to be multicast distributed from the collected data becomes a problem. This is because target data by various communications can be flowed to the network. On the other hand, since the management server 100 does not need to analyze a large amount of data in this way, it can efficiently determine whether (S, G) entries are allowed.

  In addition, the management server 100 controls the router 200 so as to stop the multicast distribution that is not permitted (in an erroneous setting). For this reason, unacceptable multicast distribution can be quickly stopped. For example, if multicast distribution continues to the clients 500 and 500a until the system administrator corrects the misconfiguration of the monitoring camera 400a, the multicast distribution with the correct settings by the monitoring camera 400 cannot be received normally by the client 500 and 500a. There is a fear. This influence is particularly serious for content that is multicast-distributed in real time, such as surveillance video, as in the multicast distribution system of the second embodiment. For example, there is a possibility that the supervisor may miss an image at an important time. According to the management server 100, since the multicast distribution that is not permitted can be stopped quickly, the influence on the existing multicast distribution can be reduced.

  In addition, the management server 100 instructs the monitoring camera 400a to stop multicast distribution. Thereby, it is not necessary to send an extra multicast packet in the transmission source tree from the monitoring camera 400a to the router 200. Therefore, the load on the network can be reduced.

  In the multicast distribution system according to the second embodiment, the management server 100 identifies an erroneously set (S, G) entry. For this reason, even if the router 200 operating as the RP router cannot determine which (S, G) entry has been misconfigured, the management server 100 is inquired to identify the misconfigured (S, G) entry. Can be deleted appropriately. That is, it is not necessary to incorporate a function for detecting an (S, G) entry erroneously set in each router. However, this does not prevent the function of the management server 100 from being realized by one or a plurality of RP routers. For example, the function of the management server 100 may be replaced by one or a plurality of RP routers.

  In addition to the router 200, the management server 100 can be connected to a plurality of other RP routers via a network. The management server 100 can centrally manage a plurality of other RP routers by similarly executing the information processing of the second embodiment for a plurality of other RP routers. In that case, it is conceivable to register each record of the address information history table 111 including RP router identification information (for example, the IP address of the RP router). This is to manage the history for each RP router.

  Note that the notification in step ST103 may be executed after the PIM (S, G) JOIN message and the PIM register stop message are transmitted from the router 200 to the router 300. This is because if the PIM register message is continuously transmitted, steps ST107 to ST109 may be repeatedly executed. Similarly, the notification in step ST106 may be executed after the PIM (S, G) JOIN message and the PIM register stop message are transmitted from the router 200 to the router 300a. The PIM (S, G) JOIN message is a control message used for creating a source tree from the FHR to the RP router in the PIM-SM. The PIM register stop message is a control message for instructing the FRP to stop the transmission of the PIM register message to the FHR in the PIM-SM. The FHR that has received the PIM register stop message stops transmission of the PIM register message. However, this does not prevent the router 200 from executing step ST103 (or step ST106) before sending the PIM register stop message.

By the way, FIG. 8 demonstrated that step S25, S26 may be performed in reverse order. Therefore, an example of processing when steps S25 and S26 are executed in the reverse order will be described.
FIG. 10 is a sequence diagram illustrating another process example of the second embodiment. In the following, the process illustrated in FIG. 10 will be described in order of step number. The sequence in FIG. 10 is different in that steps ST108a to ST110a are executed instead of steps ST108 to ST110 in FIG. Steps ST101 to ST107 are the same as the steps having the same reference numerals described in FIG.

  (Step ST108a) The management server 100 instructs the monitoring camera 400a to stop transmission of multicast packets destined for the multicast address G1. In response to the instruction, the monitoring camera 400a stops transmission of the multicast address G1.

  (Step ST109a) The management server 100 refers to the address information history table 111 in response to the inquiry, and specifies that (S2, G1) registered later among the entries with overlapping destination multicast addresses is an erroneous setting. To do. The management server 100 notifies the router 200 that (S2, G1) is an erroneous setting. The router 200 receives the notification.

(Step ST110a) The router 200 deletes the (S, G) entry corresponding to the notified (S2, G1) from the routing table 211.
As described above, the management server 100 may notify the router 200 of the erroneously set (S, G) entry after instructing the monitoring camera 400a to stop the multicast packet first.

  If the transmission of the multicast packet from the monitoring camera 400a is stopped, the router 200 does not receive the multicast packet from the monitoring camera 400a. Here, some RP routers delete a (S, G) entry from the routing table 211 when a multicast packet is not received for a predetermined time for a certain (S, G) entry. When the router 200 operates in this way, the management server 100 may not execute steps ST109a and ST110a after executing step S108a. This is because an erroneously set (S, G) entry can be deleted by timeout.

[Third Embodiment]
Hereinafter, a third embodiment will be described. Items that differ from the second embodiment described above will be mainly described, and descriptions of common items will be omitted.

  In the second embodiment, the management server 100 specifies an erroneously set (S, G) entry based on the address information history table 111. On the other hand, an (S, G) entry that permits registration in the routing table 211 of the router 200 may be set in the management server 100 in advance. In the third embodiment, a specific example in this case will be described.

  Here, the entire multicast distribution system, apparatus, hardware example, and software example of the third embodiment are the same as the entire multicast distribution system, apparatus, and hardware of the second embodiment described with reference to FIGS. Similar to the example and the software example. However, the third embodiment is different in that the address information table 112 is stored in advance in the storage unit 110 instead of the address information history table 111.

  FIG. 11 illustrates an example of an address information table according to the third embodiment. The address information table 112 includes items of item number, source address, and destination multicast address.

  In the item number item, a number for identifying the record is registered. In the transmission source address item, the transmission source address of an (S, G) entry that allows registration in the routing table of the RP router is registered. In the “destination multicast address” field, the destination multicast address of an (S, G) entry that permits registration in the routing table of the RP router is registered.

  For example, in the address information table 112, information that the item number is “1”, the source address is “10.1.1.1”, and the destination multicast address is “239.1.1.1” is registered. . This indicates that registration of the (S, G) entry including the source address “10.1.1.1” and the destination multicast address “239.1.1.1” in the routing table is permitted.

FIG. 12 is a flowchart illustrating a processing example of the RP router according to the third embodiment. In the following, the process illustrated in FIG. 12 will be described in order of step number.
(Step S31) The relay processing unit 220 receives the PIM register message. For example, the PIM register message may be generated by the router 300a and transmitted to the router 200 when multicast distribution is performed by the monitoring camera 400a. For example, the PIM register message includes (S, G) = (“10.1.2.2”, “239.1.1.1”).

  (Step S32) The relay processing unit 220 registers the (S, G) entry in the routing table 211 stored in the storage unit 210 based on the PIM register message and the (*, G) entry. In this case, the (S, G) entry of (S, G) = (“10.1.2.2”, “239.1.1.1”) can be registered in the routing table 211.

(Step S33) The relay processing unit 220 notifies the management server 100 of information on the newly registered (S, G) entry.
(Step S <b> 34) The relay processing unit 220 determines whether or not information on an erroneously set (S, G) entry has been received from the management server 100. If received, the process proceeds to step S35. If not received, the process ends. As will be described later, when there is an erroneously set (S, G) entry based on the address information table 112, the management server 100 notifies the router 200 to that effect. The determination in step S34 can be made based on the presence or absence of the notification. For example, according to the example of the address information table 112 in FIG. 11, the (S, G) entry of (S, G) = (“10.1.2.2”, “239.1.1.1”) is This is a misconfiguration. Therefore, the relay processing unit 220 receives a notification of erroneous setting from the management server 100 for the (S, G) entry.

  (Step S <b> 35) The relay processing unit 220 deletes the (S, G) entry designated from the management server 100 from the routing table 211. For example, the relay processing unit 220 routes the (S, G) entry of (S, G) = (“10.1.2.2”, “239.1.1.1”) registered in step S32. Delete from table 211.

FIG. 13 is a flowchart illustrating a processing example of the management server according to the third embodiment. In the following, the process illustrated in FIG. 13 will be described in order of step number.
(Step S41) The management unit 120 receives information on an (S, G) entry newly registered in the router 200 that is an RP router. The information on the (S, G) entry is included in the notification in step S33 in FIG. For example, assume that (S, G) = (“10.1.2.2”, “239.1.1.1”).

  (Step S42) Based on the address information table 112 stored in the storage unit 110, the management unit 120 determines whether the (S, G) entry received in step S41 is an incorrect entry. If the entry is incorrect (that is, not allowed), the process proceeds to step S43. If it is not an erroneous entry (ie, it is allowed), the process is terminated. The combination of (S, G) = (“10.1.2.2”, “239.1.1.1”) is not registered in the address information table 112. Therefore, the management unit 120 determines that the (S, G) entry is not allowed.

(Step S <b> 43) The management unit 120 notifies the router 200 of information on an erroneously set (S, G) entry.
(Step S44) The management unit 120 acquires the IP address of the source that is performing multicast distribution due to misconfiguration from the information received in step S41. In the example of the address information table 112 in FIG. 11, the IP address “10.1.2.2” of the monitoring camera 400a. The management unit 120 instructs the source (for example, the monitoring camera 400a) to stop delivery of multicast packets. For example, when receiving the instruction, the encoder of the monitoring camera 400a stops the delivery of the multicast packet.

  In this way, the management server 100 monitors whether an incorrect (S, G) entry is registered in the routing table 211. When an incorrect (S, G) entry is registered in the routing table 211, the management server 100 controls the router 200 to stop multicast distribution. As a result, it is possible to prevent multicast distribution due to erroneous settings.

  For this reason, for example, it is possible to suppress a situation where multicast distribution from a plurality of sources is mistakenly performed with respect to one multicast group. In the example of the address information table 112, for the destination multicast address “239.1.1.1”, only the monitoring camera 400 (source address “10.1.1.1”) is permitted as a source. ing. Therefore, it is possible to suppress duplicate multicast distribution from other sources to the destination multicast address “239.1.1.1”. In the example of the address information table 112, a permitted combination of a source address and a destination multicast address is set in advance. However, this does not preclude setting in advance a combination of an unacceptable source address and destination multicast address. For example, a combination of addresses that are not permitted as (S, G) entries may be set in the address information table 112 and used for determination.

  Here, the order of steps S43 and S44 may be reversed. That is, step S44 may be executed after step S43. Further, the management unit 120 may skip step S43. That is, step S44 may be executed after step S42, and step S43 may not be executed. This is because an erroneously set (S, G) entry can be deleted from the routing table 211 of the router 200 due to timeout.

  In addition to the router 200, the management server 100 can be connected to a plurality of other RP routers via a network. The management server 100 can centrally manage a plurality of other RP routers by similarly executing the information processing of the third embodiment for a plurality of other RP routers. In that case, it is conceivable to register each record of the address information table 112 including the identification information of the RP router (for example, the IP address of the RP router). This is to manage (S, G) entries that allow registration for each RP router.

  As described above, the first embodiment can be realized by causing the computing unit 1b to execute a program. Further, the second embodiment and the third embodiment can be realized by causing the processor 101 to execute a program. The program can be recorded on a computer-readable recording medium (for example, the optical disc 13, the memory device 14, and the memory card 16).

  When distributing the program, for example, a portable recording medium in which the program is recorded is provided. It is also possible to store the program in a storage device of another computer and distribute the program via a network. The computer stores, for example, a program recorded on a portable recording medium or a program received from another computer in a storage device, and reads and executes the program from the storage device. However, a program read from a portable recording medium may be directly executed, or a program received from another computer via a network may be directly executed.

  In addition, at least a part of the information processing described above can be realized by an electronic circuit such as a DSP, ASIC, or PLD.

DESCRIPTION OF SYMBOLS 1 Information processing apparatus 1a Memory | storage part 1b Operation part 2,3,3a, 3b, 3c Relay apparatus 4,4a Transmission apparatus 5,5a Reception apparatus

Claims (8)

A storage unit that stores information indicating whether a combination of a source address and a destination multicast address is permitted;
When information indicating a combination of a source address and a destination multicast address is registered in a relay device operating as a rendezvous point, information indicating the combination is acquired from the relay device, and the storage unit is referred to When detecting that a combination is not allowed, an arithmetic unit that controls the relay device so as not to transfer data including the source address and the destination multicast address;
An information processing apparatus.   When the calculation unit acquires information indicating the combination from the relay device, the calculation unit stores the information in the storage unit in association with information indicating the time when the combination is acquired, and the combination acquired from the relay device is allowed. When determining whether or not, a combination other than the combination associated with the information indicating the earliest time among a plurality of combinations including the same multicast address as a destination is not permitted with reference to the storage unit The information processing apparatus according to claim 1, wherein   When the arithmetic unit detects that the combination registered in the relay device is not permitted, the arithmetic unit controls the device corresponding to the source address so as to stop transmission of data to the destination multicast address. The information processing apparatus according to claim 1 or 2.   The computing unit causes the relay device to delete the source address and the destination multicast address determined to be unacceptable from the routing table held by the relay device, so that the source address and the The information processing apparatus according to claim 1, wherein the relay apparatus is controlled not to transfer data including a destination multicast address.   The arithmetic unit accepts input of information indicating a combination permitted as a combination of a source address and a destination multicast address or information indicating a combination not permitted, and stores the input information in the storage unit. Item 5. The information processing apparatus according to any one of Items 1 to 4. A multicast distribution system including a plurality of relay devices for transferring data,
When information indicating a combination of a source address and a destination multicast address is registered in a relay device operating as a rendezvous point, information indicating the combination is acquired from the relay device, and whether or not the combination is permitted An information processing device that controls the relay device so as not to transfer data including the source address and the destination multicast address when detecting that the combination is not permitted with reference to the information indicating
A multicast distribution system. When information indicating a combination of a source address and a destination multicast address is registered in a relay device that operates as a rendezvous point, information indicating the combination is acquired from the relay device,
When detecting that the combination acquired from the relay device is not permitted with reference to the information indicating whether or not the combination of the source address and the destination multicast address is allowed, the source address and the Controlling the relay device not to transfer data including the multicast address of the destination,
A program that causes a computer to execute processing. A storage unit that stores information indicating whether a combination of a source address and a destination multicast address is permitted;
When information indicating a combination of a source address and a destination multicast address is registered in a relay device operating as a rendezvous point, information indicating the combination is acquired from the relay device, and the storage unit is referred to When detecting that the combination is not allowed, an arithmetic unit that controls a device corresponding to the source address so as to stop transmission of data to the destination multicast address;
An information processing apparatus.

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