JP5611422B2 - COMMUNICATION DEVICE, COMMUNICATION DEVICE CONTROL METHOD, PROGRAM, AND SYSTEM - Google Patents

Description

The present invention has a plurality of addresses, the communication apparatus for communicating with an external device using any of the address selected from the plurality of addresses, the control method for a communication apparatus, program, and system.

  2. Description of the Related Art Conventionally, various devices such as a personal computer, a printer, and a multi-function peripheral (Multi Function Peripheral) exist as devices having a function of performing communication via a network such as an intranet or the Internet. Currently, a protocol widely used in devices capable of communication via a network is the Internet protocol. In the method using the Internet protocol, a unique address (IP address) is assigned to each device, and each device identifies each other on an IP address basis.

  In IPv4 (IP version 4), which is a conventional IP protocol, one address is assigned to one network interface as an address for a terminal that communicates by network connection to identify a communication partner.

On the other hand, in IPv6 (IP version 6), which has become widespread in recent years, a plurality of addresses may be assigned to one network interface. Specifically, the plurality of addresses given to one network interface include the following types of addresses.
An IP address (stateless address) automatically acquired when the terminal communicates with the router when the terminal is connected to the router (see Non-Patent Document 1).
An IP address (privacy address) for protecting the privacy of the terminal (see Non-Patent Document 2 and Non-Patent Document 3).
An IP address (link local address) that is uniquely assigned to each network interface.
An IP address issued by a DHCP (Dynamic Host Configuration Protocol) server (see Non-Patent Document 4).

  As described above, a device (communication device) that supports an IPv6 address may be assigned an IPv4 address or a plurality of types of IPv6 addresses to one network interface.

  Furthermore, a method of selecting an IP address for communication in a device (communication device) having a plurality of IP addresses as described above is known (see Non-Patent Document 5).

Internet Engineering Task Force RFC2462 “IPv6 Stateless Address Auto-configuration” <URL: http://www.ietf.org/rfc/rfc2462.txt> Internet Engineering Task Force RFC3041 “Privacy Extensions for Stateless Address Auto-configuration in IPv6” <URL: http://www.ietf.org/rfc/rfc3041.txt> Internet Engineering Task Force RFC4941 “Privacy Extensions for Stateless Address Auto-configuration in IPv6” <URL: http://www.ietf.org/rfc/rfc4941.txt> Internet Engineering Task Force RFC3315 “Dynamic Host Configuration Protocol for IPv6” <URL: http://www.ietf.org/rfc/rfc3315.txt> Internet Engineering Task Force RFC3484 “Default Address Selection for Internet Protocol version 6” <URL: http://www.ietf.org/rfc/rfc3484.txt>

  As a method for selecting an address used for communication with an external device when one device has a plurality of IP addresses, for example, based on a prefix length as shown in Non-Patent Document 5 (RFC3484) described above. There is a way to select an address.

  However, depending on the type of address, (1) the validity period is set but the validity period can be extended, and (2) the validity period is set and the validity period cannot be extended. , (3) There are those for which no valid period is set.

  When an address is selected from a plurality of addresses in accordance with RFC3484, an address of a type for which the valid period is set and the valid period cannot be extended is selected as shown in (2). May occur.

  That is, when the selected address is used as the source address of data transmitted from the communication device to the external device, it is not necessary to continuously use the same address because of temporary use. Therefore, no particular problem occurs even if the address to be used is any of (1) to (3).

  However, for example, when the selected address is registered in the external device and the external device uses the address later, the valid period is set as in (2) and the valid period is set. Addresses that cannot be extended are not suitable. This is because when the external device actually uses the address, if the valid period has already passed and the address has been changed to another address, normal communication cannot be performed.

  This problem needs to be considered particularly when selecting an address to be registered as an event notification destination in WS-Eventing Subscribe, which is registered in advance to notify the occurrence of an event in the server to the client. In other words, if a valid address is set as the event notification destination as shown in (2) and the valid address cannot be extended, an event notification is requested after the valid period has passed. The terminal that did not receive the event notification. Also, the server that notifies the event has to perform a useless process of notifying the event to the destination that does not exist even though the destination address does not already exist. End up.

  The present invention has been made in view of the above problems, and according to the use of a selected address, an address of a type for which a valid period is not set or a type of address whose valid period can be extended. The purpose is to provide a mechanism for preferential selection.

To achieve the above object, the communication apparatus of the present invention, have a plurality of addresses, an external apparatus which can communicate with the communication apparatus on the network, from the previous SL plurality of addresses, the effective period is set selection means for selecting an address that can be extended address or valid period not, as an event notification destination generated by said external device, and registers the address selected by said selecting means to said external device And a registration unit .
To achieve the above object, the communication apparatus of the present invention, have a plurality of addresses, an external apparatus which can communicate with the communication apparatus on the network, as an event notification destination generated by said external device, said address registration means for registering one of a plurality of addresses to said external device, the address which can extend the address or valid period effective period is not set is registered in the external device by said registration means And a control means for controlling to be selected .

The communication control method of the present invention, have a plurality of addresses, a control method of the available communication devices with an external device on the network, from the previous SL plurality of addresses, are effective period is set a selecting step of selecting an address that can be extended without address or valid period, as an event notification destination generated in the external device, the registration process of registering the address selected in the selection step to the external device characterized in that it comprises and.
The communication control method of the present invention, have a plurality of addresses, a control method of the available communication devices with an external device on the network, the events that occur in the external device as the notification destination, a plurality of selected as an address or a registration process and an address capable of extending the address or valid period effective period is not set to be registered in the external device address is registered in the external device in the registration process And a control step of controlling as described above .
The system of the present invention is a system having a first communication device having a plurality of addresses and a second communication device, wherein the first communication device has an effective period from among the plurality of addresses. A selection unit that selects an address that is not set or an address that can extend the validity period; and an address selected by the selection unit as a notification destination of an event that has occurred in the second communication device. Registration means for registering to the communication device, wherein the second communication device comprises notification means for notifying an event generated by the second communication device to an address registered by the registration means. And
The system of the present invention is a system having a first communication device having a plurality of addresses and a second communication device, wherein the first communication device is generated by the second communication device. Registration means for registering one of the plurality of addresses in the second communication device as an event notification destination, and an address for which an effective period is not set or an address capable of extending the effective period are the registration means Control means for controlling to be selected as an address to be registered in the second communication device by the second communication device, wherein the second communication device causes an event occurring in the second communication device to be registered by the registration means. Notification means for notifying a registered address is provided.

  According to the present invention, it is possible to preferentially select a type of address for which a valid period is not set or a type of address whose valid period can be extended according to the use of the selected address. .

It is a block diagram which shows the structural example of the software of client PC as a communication apparatus which concerns on the 1st Embodiment of this invention. It is a conceptual diagram which shows the structural example which connected client PC and server PC by the network. It is a block diagram which shows the structural example of the hardware of client PC. It is a flowchart which shows the address selection process of a client PC. It is a figure which shows the example of the address information of the address information storage part of the communication library of client PC. It is a figure which shows the example of the address information of the address information storage part of the communication library of client PC. It is a figure which shows the example of the communication usage selection screen displayed on the display part of client PC concerning the 2nd Embodiment of this invention. It is a flowchart which shows the address selection process of a client PC. It is a flowchart which shows the address selection process of the client PC concerning the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the first to third embodiments, a description will be given of processing in which a device having a plurality of IP addresses selects its own IP address used for communication with an external device. Specifically, a device having a plurality of IP addresses normally selects an address based on the priority order determined in accordance with RFC3484. However, especially when the application of the selected address is a specific application, an address that can be used more fixedly (an address of a type for which an effective period is not set or a type that can extend the effective period) Address).

[First Embodiment]
First, the configuration of the client PC and the server PC according to the present embodiment will be described in detail with reference to FIGS.

  FIG. 2 is a conceptual diagram showing a configuration example in which a client PC and a server PC according to the present embodiment are connected via a network.

  In FIG. 2, a client PC 100 and a server PC 105 are configured to be able to communicate via a network 106 such as a LAN or a WAN. The client PC 100 holds an IP address to communicate with various devices including the server PC 105 in the network 106. The client PC 100 can hold a plurality of IP addresses. The server PC 105 provides a service that responds to a request transmitted from the client PC 100 via the network 106.

Examples of services provided by the server PC 105 include WWW (World Wide Web), DNS (Domain Name System), and e-mail. In addition, SNMP (Simple Network Managem
(ent Protocol) Agent and WS-Eventing functions may be provided. Note that the protocol provided by the server PC 105 is not limited as long as it is communication using an IP address.

  When the client PC 100 holds a plurality of IP addresses as described above, when communicating with the server PC 105, an address corresponding to the address (destination address) of the server PC 105 is selected from the plurality of IP addresses. The address selected here is used as a source address of data transmitted from the client PC 100 to the server PC 105.

  Even when the client PC 100 registers an address with the server PC 105, it is necessary to select an appropriate address. For example, when performing SNMP Trap or WS-Eventing Subscribe, an address is selected from a plurality of IP addresses and registered in the server PC 105 as the address of the client PC 100 (event notification destination). The server PC 105 notifies an event that has occurred in its own apparatus to the registered address.

  FIG. 3 is a block diagram illustrating a hardware configuration example of the client PC 100.

  In FIG. 3, the client PC 100 includes a CPU 1, a RAM 2, a ROM 3, a system bus 4, a keyboard control unit 5, a display control unit 6, a storage control unit 7, and a network control unit 8. The client PC 100 further includes a keyboard 9, a display unit 10, an external memory 11, and a bidirectional interface 12. Since the configuration of the server PC 105 is the same as that of the client PC 100, illustration and description are omitted.

  The CPU 1 is a central processing unit that comprehensively controls each device connected to the system bus 4. The CPU 1 performs document processing in which graphics, images, characters, tables (including spreadsheets, etc.) are mixed based on an application (document processing program or the like) stored in the program ROM of the ROM 3 or the external memory (HD) 11. Etc. are executed. Moreover, CPU1 performs the process shown to each below-mentioned flowchart based on the program of this invention. Further, the CPU 1 executes an outline font rasterization process on the display RAM set in the RAM 2, for example, and displays it on the display unit 10 via the display control unit 6.

  Further, the CPU 1 opens various windows registered in the client PC based on commands instructed by a mouse cursor (not shown) displayed on the display unit 10 and executes various data processing. When using the client application 101 (see FIG. 1) or the server application (not shown), the user can open a window related to operations such as setting and perform settings.

  The RAM 2 functions as a main memory and work area for the CPU 1. The ROM 3 includes a font ROM, a program ROM, and a data ROM (not shown). The font ROM or external memory 11 stores font data and the like used for document processing. The program ROM or external memory 11 stores an OS that is a control program for the CPU 1, a program of the present invention, and the like. The data ROM or external memory 11 stores various data used when performing document processing or the like. The program stored in the external memory 11 is expanded and executed in the RAM 2 at the time of execution.

  The keyboard control unit 5 controls input information from a keyboard 9 and a pointing device (not shown). The display control unit 6 controls display on the display unit 10. The storage control unit 7 controls writing / reading of data to / from the external memory 11. The network control unit 8 controls communication via the bidirectional interface 12 and the network 106. The keyboard 9 is used for various inputs. The display unit 10 displays figures, image characters, tables, and the like. The external memory 11 includes a hard disk (HD), a floppy (registered trademark) disk (FD), and the like, and stores a boot program, various application programs, font data, a user file, an edit file, and the like.

  FIG. 1 is a block diagram showing a software configuration example of a client PC 100 as a communication apparatus according to the present embodiment.

  In FIG. 1, a client PC 100 includes a client application 101 and a communication library 102. The communication library 102 includes a communication control unit 301, an address information acquisition unit 302, an address validity period update determination unit 303, an address management unit 304, and an address information storage unit 305. Furthermore, the communication library 102 includes an address priority order determination unit 306, an address determination unit 307, an address usage selection unit 308, and an IPv6 anonymous address determination unit 309.

  In response to a request from the client application 101, the client PC 100 communicates with the server PC 105 connected to the network 106 via a stub object (not shown) and the communication library 102.

  In the communication library 102, the communication control unit 301 determines the attribute information of the address acquired by the address information acquisition unit 302, and selects an address actually used for communication according to the determination result. Further, the communication control unit 301 performs communication between the client application 101 and the server PC 105 using the selected address.

  The address information acquisition unit 302 acquires from the OS information on a source address that can be used for communication and an address (event notification destination address) registered in the server PC 105. As information of the acquired address, there are an address list and an attribute value of each address. The attribute value of the address includes an address version, a recommended valid period, a final valid period, a prefix (Prefix), an address format, and the like. Details of the address list acquisition will be described later with reference to FIG.

  Based on the attribute value of each address acquired by the address information acquisition unit 302, the address validity period update determination unit 303 can update the validity period of each address (can be extended to use the same address). Determine whether.

  The address management unit 304 manages the address information acquired by the address information acquisition unit 302 and the address information determined by the address validity period update determination unit 303. The address information storage unit 305 stores address information managed by the address management unit 304.

  The address priority order determination unit 306 determines the priority order of addresses in accordance with the provisions of RFC3484 based on the address information stored in the address information storage unit 305 and the communication destination address (destination address) that the client PC 100 is to communicate with. To do.

  The address determination unit 307 determines an address to be used for actual communication based on the determination result of the address priority determination unit 306. At this time, the address determination unit 307 also determines whether or not actual communication can be performed in an IP reachable manner with respect to the communication destination address (destination address) from an address having a high address priority.

  The address usage selecting unit 308 determines the address usage according to the communication purpose of the client application 101. As the determination of the use of the address, there is a method of automatically determining the use from the communication purpose of the client application 101 and the communication destination address (destination address). In the present embodiment, an example will be described in which the client application 101 determines the communication usage of the address and notifies the communication library 102 of it. The selection of the communication usage of the address from the communication usage selection screen (see FIG. 7) will be described later in the second embodiment. The address usage determined by the address usage selection unit 308 is stored in the address information storage unit 305 via the address management unit 304.

  The IPv6 anonymous address determination unit 309 determines whether each address is a privacy address defined by RFC3041 or RFC4941. Further, the IPv6 anonymous address determination unit 309 determines, for each address, the recommended effective period, the final effective period, the effective period of the address set in the OS, and whether or not the effective period can be updated. judge.

  Next, the operation of the client PC 100 of the present embodiment having the above configuration will be described in detail with reference to FIGS.

  FIG. 4 is a flowchart showing the address selection process of the client PC 100. This processing is executed by the communication library 102 by the CPU 1 of the client PC 100.

  In FIG. 4, the address information acquisition unit 302 of the communication library 102 of the client PC 100 acquires a list (address list) of local addresses (source addresses) from the OS (step S401). The address information acquisition unit 302 stores the acquired address list in the address information storage unit 305 via the address management unit 304. As a method of acquiring an address list from the OS, there is a method of acquiring both an IPv4 address and an IPv6 address by specifying an AI_PASSIVE flag with getaddrinfo of the OS socket function.

  Next, the address information acquisition unit 302 acquires an address attribute (whether the validity period can be extended, etc.) (step S402). That is, the address information acquisition unit 302 determines whether or not the validity period of each address can be extended (possible or impossible), version, recommended validity period, final validity period, prefix, and address for the address list obtained in step S401 above. Get the format, etc. from the OS. The acquired address attribute is stored in the address information storage unit 305 by the communication control unit 301 via the address management unit 304.

  Next, the address priority determination unit 306 determines the priority of local addresses used for communication based on RFC3484 (step S403). In this case, the address priority determination unit 306 determines the priority order of the addresses based on the address information stored in the address information storage unit 305 and the communication destination address (destination address) instructed from the client application 101. To do.

  Next, the address determination unit 307 determines whether or not the local address used for communication is an address registered in the server PC 105 based on an instruction from the client application 101 (step S404). In this case, the address determination unit 307 determines whether the address is used as the IP address of the third layer (network layer) of the OSI reference model or the IP address used in another layer (included in the data). To do.

  For example, the communication address information included in the seventh layer (application layer), the sixth layer (presentation layer), the fifth layer (session layer), and the like is determined to be an address registered in the server PC 105. Specifically, when an event notification is requested to the server PC 105 by WS-Eventing, it is determined as an address registered in the server PC 105 when used as an event notification destination address designated as NotifyTo. Detailed specifications of WS-Eventing are provided at the following URL.

<URL: http://www.w3.org/Submission/WS-Eventing/>
If it is determined in step S404 that the address is registered in the server PC 105, the address determination unit 307 performs the following process. Identify an address that can be extended for a valid period or a fixed address (an address for which a valid period is not set). Then, the address having the highest priority determined in step S403 is selected from the identified addresses, and the selected address is set as an address used in actual communication (step S405). Thereafter, the process proceeds to step S407.

  In this way, by using an address whose valid period can be extended or a fixed address as an address to be preferentially registered in the server PC 105, an address re-registration process accompanying an address change to the server PC 105 becomes unnecessary, or It becomes possible to reduce.

  That is, the address determination unit 307 determines an address to be used for actual communication based on the instruction from the client application 101, the communication destination address (destination address), and the determination result of the address priority determination unit 306 in step S403. To do. At this time, the address determination unit 307 also determines whether or not actual communication can be performed in an IP reachable manner with respect to a communication destination address (destination address) from an address having a high priority.

  On the other hand, if it is determined in step S404 that the address is not registered in the server PC 105, the address determination unit 307 performs the following process. The address actually used for communication is selected from the list of address priorities based on RFC3484 created by the address priority determination unit 306 in step S403 (step S406). Thereafter, the process proceeds to step S407.

  After the address selection in step S405 or step S406 is completed, the communication control unit 301 communicates with the server PC 105 using the address selected in step S405 or step S406 (step S407). Thereby, this process is complete | finished.

  FIG. 5 is a diagram illustrating an example of address information in the address information storage unit 305 of the communication library 102 of the client PC 100.

  FIG. 5 shows an example of address information in the address information storage unit 305 in step S403 in FIG. The address information includes a priority 501, an address type 502, a source address (local address) 503, and validity period extension availability information (extension impossible, extension possible, N / A (fixed address)) 504. In the example of FIG. 5, the priorities “1”, “2”, and “3” are the validity period cannot be extended, can be extended, and N / A (fixed address, that is, the validity period is not set), respectively. ing.

In the example shown in FIG. 5, the address type 502 and priority 501 of each source address (local address) 503 are shown for the destination address fd00 :: 1000: 4000: 3000: 2000: 1000. As an example of the address attribute, validity period extension availability information 504 is included. In the priority order based on RFC3484, the priority is high in the following order.
・ Fd00 :: 1000: 2000: 30ff: fe00: 4000
・ Fd00 :: 1000: 5000: 6000: 7000: 8000
・ Fe80 :: 1000: 1234: 5678: 9abc: def0
FIG. 6 is a diagram illustrating an example of address information in the address information storage unit 305 of the communication library 102 of the client PC 100. The address information includes a priority order 601, an address type 602, a source address (local address) 603, and validity period extension availability information (extension possible, N / A (fixed address)) 604. In the example of FIG. 6, the priority orders “1” and “2” are valid period extension and N / A, respectively.

  That is, the address type 602 and the priority 601 of each source address (local address) 603 are shown for the destination address fd00 :: 1000: 4000: 3000: 2000: 1000. As an example of the address attribute, validity period extension availability information 604 is included. The highest priority fd00 :: 1000: 2000: 30ff: fe00: 4000 shown in FIG. 5 is deleted because it cannot be extended. fd00 :: 1000: 5000: 6000: 7000: 8000 is determined as the address with the highest priority, and is used as an address to be registered in the server PC 105.

  As described above, by preferentially selecting an address whose validity period can be extended as an address to be registered in the server PC 105, an address re-registration process associated with an address change to the server PC 105 can be eliminated or reduced. It becomes.

  In this embodiment, the case where an address to be registered in the server PC 105 is selected has been described as an example, but the present invention is not limited to this. As described above, the present invention can also be applied to the case where the source address of the third layer (network layer) IP address of the OSI reference model is selected.

[Second Embodiment]
The second embodiment of the present invention differs from the first embodiment in the following points. Since the other elements of the present embodiment are the same as the corresponding ones of the first embodiment (FIGS. 1, 2, and 3), description thereof is omitted.

  In the first embodiment, the example in which the communication usage of the address is selected by the communication library 102 according to the communication purpose of the client application 101 of the client PC 100 has been described.

  In the present embodiment, an example will be described in which a communication usage of an address is selected by the communication library 102 based on an instruction from a user via a communication usage selection screen (FIG. 7). Selection information corresponding to the item selected by the user from the communication usage selection screen is transmitted to the address usage selection unit 308 by the user interface unit (not shown). The address usage selection unit 308 determines the communication usage of the address based on the selection information. As a result, it is possible to select a communication address suitable for the communication application desired by the user.

  FIG. 7 is a diagram illustrating an example of a communication usage selection screen displayed on the display unit 10 of the client PC 100 according to the present embodiment.

  In FIG. 7, for example, the following items are displayed on the communication usage selection screen (dialog). Register the address to the server (fixed address or extendable address takes priority). Confidentiality (uses addresses that cannot be extended). Internet communication (uses addresses that cannot be extended). Intranet communication (priority address or extendable address takes priority).

  FIG. 8 is a flowchart showing address selection processing of the client PC 100 according to the present embodiment. This processing is executed by the communication library 102 by the CPU 1 of the client PC 100.

  8, steps S401 to S403 and steps S405 to S407 are the same as steps S401 to S403 and steps S405 to S407 in FIG. Only the differences will be described below.

  In step S801, the address usage selection unit 308 of the communication library 102 of the client PC 100 acquires the address usage according to the user's communication purpose. As an example of a method for selecting a user's communication purpose, a case where a user interface unit that has received selection of a communication usage of an address by the user from the communication usage selection screen in FIG.

  The address usage selection unit 308 determines the communication usage of the address based on the selection information. The determination result of the address usage selection unit 308 is stored in the address information storage unit 305 via the address management unit 304 and used for determination of the address priority in the address priority determination unit 306.

  In step S802, the address determination unit 307 determines whether or not the address used for communication is a communication application that prioritizes a fixed address or an extendable address based on the communication application selected by the user on the communication application selection screen in FIG. judge.

  If it is determined that the address used for communication is a communication application in which priority is given to a fixed address or an extendable address, the process of step S405 is performed. On the other hand, if it is determined that the address used for communication is not a communication application that gives priority to a fixed address or an extendable address, the process of step S406 is performed.

  As described above in detail, according to this embodiment, when selecting an address to be used for communication, it is possible to select an address suitable for a communication application designated by the user.

[Third Embodiment]
The third embodiment of the present invention is different from the first embodiment in the following points. Since the other elements of the present embodiment are the same as the corresponding ones of the first embodiment (FIGS. 1, 2, and 3), description thereof is omitted.

  In the second embodiment, the example in which the communication library 102 of the client PC 100 determines whether or not the address validity period can be updated has been described. However, depending on the version of a general OS or a specific OS, it may not be possible to directly acquire an attribute for determining whether or not the address validity period can be updated.

  In the present embodiment, an example will be described in which whether or not an effective period can be updated is determined when an attribute for determining whether or not an effective period of an address can be updated cannot be directly acquired. Especially for anonymous addresses defined in RFC3041 or RFC4941, the validity period cannot be updated due to the characteristics of the addresses. In some cases, it is not possible to determine whether or not the validity period can be updated based on the recommended validity period, the final validity period, and the OS attribute value set by the router or the address issuing server. In the present embodiment, whether or not the validity period can be updated is determined by the following processing.

  FIG. 9 is a flowchart showing address selection processing of the client PC 100 according to the present embodiment. This processing is executed by the communication library 102 by the CPU 1 of the client PC 100.

  9, step S401 and step S403 to step S407 are the same as step S401 and step S403 to step S407 in FIG. Only the differences will be described below.

  In step S901, the IPv6 anonymous address determination unit 309 determines an address format to determine whether each address acquired in step S401 in FIG. 4 is a privacy address defined in RFC3041 or RFC4941. The IPv6 anonymous address determination unit 309 determines an anonymous address when the address includes an attribute value indicating a temporary address as an OS attribute value and is not an address in the EUI-64 format (predetermined format) defined by IEEE.

For the EUI-64 format address defined by the IEEE, see the following URL specification: http://standards.ieee.org/regauth/oui/tutorials/EUI64.html
If it is determined that the anonymous list is not included in the address list acquired in step S401, the process proceeds to step S404. On the other hand, if it is determined that the address list acquired in step S401 includes an anonymous address, the process proceeds to step S902.

  In step S902, the IPv6 anonymous address determination unit 309 sets the IPv6 anonymous address as an address whose validity period cannot be extended.

  With the above processing, it is possible to make the following determination especially for anonymous addresses defined in RFC3041 or RFC4941. That is, even when it is not possible to determine whether or not the valid period can be updated from the recommended valid period, the final valid period, and the OS attribute value set by the router or the address issuing server, it can be correctly determined that the valid period cannot be updated.

  As described above in detail, according to the present embodiment, when selecting an address to be used for communication, it is determined whether or not the validity period can be extended, particularly in the case of an anonymous address defined in RFC3041 or RFC4941. The address can be selected.

[Other Embodiments]
In the above embodiment, the configuration in which the client PC and the server PC are connected to the network has been described as an example, but the present invention is not limited to this. In addition to the PC, other devices such as a network device, an information processing apparatus, and a communication apparatus may be connected to the network.

  In the above-described embodiment, the configuration in which the connection method between the client PC and the server PC is a network such as a LAN or WAN has been described as an example. However, the present invention is not limited to this. Various connection methods such as a network other than a LAN or WAN, a wireless LAN such as IEEE802.11, a serial interface such as IEEE1394, and the like can be applied.

  In the above embodiment, the case where the present invention is applied to a PC has been described as an example, but the present invention is not limited to this. The present invention can also be applied to a printer, a multifunction peripheral (MFP), and the like.

  The object of the present invention is achieved by executing the following processing. That is, a storage medium in which a program code of software that realizes the functions of the above-described embodiments is recorded is supplied to the system or apparatus, and the computer (or CPU, MPU, etc.) of the system or apparatus is stored in the storage medium. This is a process of reading the program code.

  In this case, the computer-readable program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code and the storage medium storing the program code constitute the present invention. It will be.

  Moreover, the following can be used as a storage medium for supplying the program code. For example, floppy (registered trademark) disk, hard disk, magneto-optical disk, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW, magnetic tape, nonvolatile memory card, ROM or the like. Alternatively, the program code may be downloaded via a network.

  Further, the present invention includes a case where the function of the above-described embodiment is realized by executing the program code read by the computer. In addition, an OS (operating system) running on the computer performs part or all of the actual processing based on an instruction of the program code, and the functions of the above-described embodiments are realized by the processing. Is also included.

  Furthermore, a case where the functions of the above-described embodiment are realized by the following processing is also included in the present invention. That is, the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, based on the instruction of the program code, the CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing.

100 client PC
105 server PC
106 Server PC
DESCRIPTION OF SYMBOLS 301 Communication control part 302 Address information acquisition part 303 Address effective period update determination part 304 Address management part 305 Address information storage part 306 Address priority order determination part 307 Address determination part 308 Address use selection part 309 IPv6 anonymous address determination part

Claims (15)

Have a plurality of addresses, an available communication device and an external device on the network,
From the previous SL plurality of addresses, and selecting means for selecting an address that can be extended address or valid period not effective period is set,
A communication apparatus comprising: a registration unit that registers an address selected by the selection unit in the external device as a notification destination of an event that has occurred in the external device. Wherein the plurality of validity is not set the address or valid period if the address that can be extended is included a plurality of in address, the selection means have validity period is set according to Jo Tokoro priority The communication apparatus according to claim 1, wherein no address or an address whose valid period can be extended is selected. Storage means for storing the address and attribute information of the address in association with each other;
The communication device according to claim 1, wherein the selection unit selects an address for which a valid period is not set or an address capable of extending the valid period based on the attribute information. Have a plurality of addresses, an available communication device and an external device on the network,
Registration means for registering any of the plurality of addresses in the external device as a notification destination of an event that has occurred in the external device ;
And wherein the address that can be extended address or valid period effective period has not been set and control means for controlling so as to be selected as the address to be registered in the external device by said registration means Communication device. Storage means for storing the address and attribute information of the address in association with each other;
The control unit selects, based on the attribute information, an address for which a valid period is not set or an address capable of extending the valid period as an address registered in the external device by the registration unit. The communication device according to claim 4, wherein the communication device is controlled. Communication apparatus according to any one of claims 1 to 5, characterized in that said plurality of addresses are IPv6 addresses. Have a plurality of addresses, a control method of the available communication devices with an external device on the network,
From the previous SL plurality of addresses, a selection step of selecting an address that can be extended address or valid period is not set validity period,
A communication device control method comprising: a registration step of registering an address selected in the selection step in the external device as a notification destination of an event that has occurred in the external device . Have a plurality of addresses, a control method of the available communication devices with an external device on the network,
As a notification destination of an event that has occurred in the external device, a registration step of registering any of the plurality of addresses in the external device ;
And wherein the address that can be extended address or valid period effective period is not set and a control step of controlling so as to be selected as the address to be registered in the external device in the registration process Method for controlling a communication device. A program for causing a computer to execute the communication device control method according to claim 7 or 8 . A system having a first communication device having a plurality of addresses and a second communication device,
The first communication device is:
A selection means for selecting, from the plurality of addresses, an address for which an effective period is not set or an address capable of extending the effective period;
A registration unit for registering the address selected by the selection unit in the second communication device as a notification destination of an event that has occurred in the second communication device;
The second communication device is:
A system comprising: notification means for notifying an address generated by the second communication apparatus to an address registered by the registration means. When the plurality of addresses include a plurality of addresses for which a validity period is not set or a plurality of addresses capable of extending the validity period, the selection means is an address for which a validity period is not set according to a predetermined priority. 11. The system according to claim 10, wherein an address capable of extending a validity period is selected. The first communication device is:
Storage means for storing the address and attribute information of the address in association with each other;
12. The system according to claim 10, wherein the selection unit selects an address for which a valid period is not set or an address that can extend the valid period based on the attribute information. A system having a first communication device having a plurality of addresses and a second communication device,
The first communication device is:
Registration means for registering one of the plurality of addresses in the second communication device as a notification destination of an event that has occurred in the second communication device;
Control means for controlling so that an address for which an effective period is not set or an address capable of extending the effective period is selected as an address registered in the second communication device by the registration means,
The second communication device is:
A system comprising: notification means for notifying an address generated by the second communication apparatus to an address registered by the registration means. The first communication device is:
Storage means for storing the address and attribute information of the address in association with each other;
The control means selects, based on the attribute information, an address for which a valid period is not set or an address capable of extending the valid period as an address to be registered in the second communication device by the registration means. The system according to claim 13, wherein the system is controlled to be 15. The system according to claim 10, wherein the plurality of addresses are IPv6 addresses.

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