JP2007053681A - Device, method, and program for communication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication device, a communication method, and a communication program which automatically execute a suitable operation in an IPv6 communication. <P>SOLUTION: The communication device performing communication with the IPv6 is provided with a user setting hold means which holds setting by the user for operations at a time of communication, a discrimination means which discriminates an operation at the time of communication based on the contents held in the user setting hold means, and a setting control means which performs control of operations at the time of communication based on the discrimination of the discrimination means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication device that performs communication using IPv6, an IPv6 address setting method, and an IPv6 address setting program.

  In recent years, the number of communication devices compatible with IPv6 has increased. In IPv6, since one link local address is always assigned to each device, the user can immediately communicate with other devices without setting anything when the cable is connected.

  In addition to the link local address, the IPv6 address includes a stateless address. This address is generated based on RA (router advertisement) distributed from the router. This stateless address has an expiration date, and when the expiration date is exceeded, the address cannot be used.

  Since the expiration date is updated by RA periodically transmitted from the router, the expiration date can be normally used without worrying about the expiration date.

  However, if the router cannot operate normally due to power off of the router, the address becomes invalid and communication cannot be continued. In this case, for example, the image data for printing cannot be used even during transmission, and printing is impossible.

  This is a more likely problem if, for example, the address is generated by RA having a lifetime that is extremely short.

  Furthermore, there are terminals that send RAs through a router, and addresses generated based on such RAs have security problems.

  The present invention has been made in view of such a problem, and an object thereof is to provide a communication device, a communication method, and a communication program that automatically execute an appropriate operation in IPv6 communication.

  In order to solve the above-described problems, the present invention is based on user settings holding means for holding settings by a user regarding operations at the time of communication and contents held in the user setting holding means in a communication device that performs communication using IPv6. And determining means for determining operation during communication, and setting control means for controlling operation during communication based on the determination by the determining means.

  In order to solve the above problem, the present invention is characterized in that the setting is a lifetime length of a stateless address.

  In order to solve the above problem, the present invention is characterized in that the setting is an IP address of a router that transmits a router advertisement.

  In order to solve the above problem, the present invention is characterized in that the setting is an IP address of a default gateway.

  In order to solve the above problem, the present invention is characterized in that the setting is an IP address of a router that can be a default gateway.

  In order to solve the above problem, the present invention is characterized in that the setting is a warning display setting as to whether or not the setting control means displays a warning regarding communication to a user.

  In order to solve the above-mentioned problem, the present invention is characterized in that the warning display setting is a setting for warning that an IP address becomes invalid.

  In order to solve the above problem, the present invention is characterized in that the warning display setting is a setting for warning that an IP address has expired.

  In order to solve the above problem, the present invention is characterized in that the warning display setting is a setting for warning that a router advertisement has been received from a router not registered by the user.

  In order to solve the above problem, the present invention is characterized in that the warning display setting is a setting for warning that IP addresses are duplicated.

  In order to solve the above problem, the present invention is characterized in that the warning display setting is a setting for warning that the default gateway has been changed.

  In order to solve the above problem, the present invention is characterized in that the warning display setting is a setting for warning that the lifetime length provided by the router advertisement is shorter than a predetermined value.

  In order to solve the above-described problem, the present invention is a communication method in a communication device that performs communication using IPv6, and is set in a setting stage in which settings are made by a user regarding operations during communication, and is set in the setting stage. A user setting holding stage for holding the content, a determination stage for determining an operation at the time of communication based on the contents held at the user setting holding stage, and a control of the operation at the time of communication based on the determination at the determination stage. And a setting control stage to perform.

  In order to solve the above problem, the present invention is characterized in that the setting is a lifetime length of a stateless address.

  In order to solve the above problem, the present invention is characterized in that the setting is an IP address of a router that transmits a router advertisement.

  In order to solve the above problem, the present invention is characterized in that the setting is an IP address of a default gateway.

  In order to solve the above problem, the present invention is characterized in that the setting is an IP address of a router that can be a default gateway.

  In order to solve the above-mentioned problem, the present invention is characterized in that the setting is a warning display setting as to whether or not the setting control stage displays a warning related to communication.

  In order to solve the above-mentioned problem, the present invention is characterized in that the warning display setting is a setting for warning that an IP address becomes invalid.

  In order to solve the above problem, the present invention is characterized in that the warning display setting is a setting for warning that an IP address has expired.

  In order to solve the above problem, the present invention is characterized in that the warning display setting is a setting for warning that a router advertisement has been received from a router not registered by the user.

  In order to solve the above problem, the present invention is characterized in that the warning display setting is a setting for warning that IP addresses are duplicated.

  In order to solve the above problem, the present invention is characterized in that the warning display setting is a setting for warning that the default gateway has been changed.

  In order to solve the above problem, the present invention is characterized in that the warning display setting is a setting for warning that the lifetime length provided by the router advertisement is shorter than a predetermined value.

  Moreover, in order to solve the said subject, this invention is a communication program for performing the communication method of any one of Claim 13 to 24 by a computer.

  According to the present invention, it is possible to provide a communication device, a communication method, and a communication program that automatically execute appropriate operations in IPv6 communication.

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

  FIG. 1 is a diagram illustrating a configuration in which network devices that perform IPv6 communication are connected. FIG. 1 shows two routers 1 and 2, a plurality of IPv6 compatible devices (hereinafter referred to as communication devices), and a network 6 connecting them.

  In IPv6, a communication device has a feature of holding a plurality of IPv6 addresses. Typical examples include a link local address that is always set in a communication device and a stateless address that is generated based on a router advertisement (hereinafter referred to as RA) distributed from a router.

  Usually, communication devices that support IPv6 often have stateless addresses in addition to link local addresses. This is because the link local address can communicate only with communication devices on the same network. When communicating with a communication device beyond the router, a global address is required, and a stateless address corresponds to the global address.

  In FIG. 1, the router 1 provides prefixes “2001: 1 :: / 64” and “2002: 1 :: / 64”. “2001: 1 :: / 64” is provided to the communication device 5, and “2002: 1 :: / 64” is provided to the communication device 3.

  Therefore, the stateless address of the communication device 5 is “2001: 1 :: 1111: 22FF: FE33: 5555”. The stateless address of the communication device 3 is “2002: 1 :: 1111: 22FF: FE33: 7777”.

  The router 2 provides the prefixes “2003: 1 :: / 64” and “2004: 1 :: / 64”. “2003: 1 :: / 64” is provided to the communication device 3, and “2004: 1 :: / 64” is provided to the communication device 4.

  Therefore, the stateless address of the communication device 3 is “2002: 1 :: 1111: 22FF: FE33: 7777” and “2003: 1 :: 1111: 22FF: FE33: 7777”. Further, the stateless address of the communication device 4 is “2004: 1 :: 1111: 22FF: FE33: 2222”.

  Unlike the IPv4 address, these stateless addresses have a lifetime, and the address expires when the lifetime expires. Specifically, two types of lifetimes, preferred lifetime and valid lifetime, are set in the prefix distributed by the router.

  If the preferred lifetime expires, it is not recommended to use for new communications, and if the valid lifetime expires, the address will expire. As a result, the valid lifetime of the valid lifetime may expire during communication and sudden communication becomes impossible.

  Next, the software module configuration of the communication device will be described with reference to FIG. FIG. 2 shows an application 10, a network control unit 11, and an OS 12. The network control unit 11 includes a user setting holding table 13, a user option determination unit 14, a network setting control unit 15, and a network information monitoring unit 16. The OS 12 includes a network protocol 17 and a network communication driver 18.

  The application 10 is used by the user for setting. The user uses this application 10 to make settings described later. The user setting holding table 13 holds user settings related to operations during communication. The user option determination unit 14 determines an operation during communication based on the content held in the user setting holding table 13. The network setting control unit 15 controls the operation during communication based on the determination of the user option determination unit 14.

  For example, when the user sets a notification to be notified when the preferred lifetime expires, the network setting control unit 15 displays information from the OS at the time when the preferred lifetime expires to the user. The network information monitoring unit 16 monitors information transmitted from a router or the like.

  The communication program including the application 10, the network control unit 11, and the OS 12 is read into a communication device from a detachable recording medium or held in a recording device such as a ROM and executed by the CPU using a RAM or the like. Is done.

  The user setting holding table 13 described above corresponds to user setting holding means. The user option determination unit 14 corresponds to a determination unit. The network setting control unit 15 corresponds to setting control means.

  Next, processing related to setting will be described using the flowchart of FIG. Step S101 is a determination of whether to use the IPv6 automatic setting function. If the user does not use the IPv6 automatic setting function, the process ends. In this case, the RA from the router is not received, only the link local address is generated, and communication beyond the router is not possible.

  When the IPv6 automatic setting function is used, the IPv6 automatic setting function is validated in step S102. The next step S103 is a determination as to whether to select a security mode. If no security mode is selected, the process ends.

  If it is determined that the security mode is arbitrary by the user, it is determined whether or not the lifetime length of the stateless address is designated in step S108 through step S104. If not specified by the user, a default value is specified in step S109. In the case of designating, the user arbitrarily designates the lifetime length in step S110.

  In the next step S111, it is determined whether or not to set the RA distribution destination router address. This setting is a setting for generating an address only by RA transmitted from the set RA distribution destination router address. If not, all routers that are default values are set in step S112. When setting, in step S113, the user arbitrarily sets the RA distribution destination router address.

  In the next step S114, it is determined whether or not to automatically set a default gateway address. In the case of setting, automatic setting is enabled in step S115. If not set, the automatic setting is invalidated in step S116, and the process proceeds to step S121.

  In the next step S117, it is determined whether or not an address of a router that can be a default gateway is designated. If not specified, all routers that are default values are specified in step S118. If so, in step S119, the user arbitrarily designates a router.

  Returning to the description of step S103. In step S103, in addition to selecting the user as described above, it is possible to select security mode high, medium, and low in steps S105, 106, and 107.

  The security mode high, medium and low is a value in which the above items are automatically set in advance according to the security level. For example, when “high security mode” is selected, “limit of lifetime length of stateless address” and “limit of RA distribution destination router” are set.

  In the next step S121, it is determined whether or not to display a warning. If not, the warning display in step S123 is invalidated and the process ends. If so, security display is enabled in step S122, and it is determined in step S124 whether or not to set a warning display priority. When the warning display priority is set, a default value is set in step S125, and the process ends. If the warning display priority is not set, the user arbitrarily sets it in step S126, and the process ends.

  This warning display setting process will be described with reference to the flowchart of FIG. Step S201 is to determine whether or not to issue a warning regarding the valid time of the stateless address. If no warning is given, the process proceeds to step S211. When warning is performed, in step S202, it is determined whether to set a preferred lifetime or a valid lifetime.

  In the case of the preferred lifetime, the preferred lifetime is set to expire in step S203. In the case of valid lifetime, the valid lifetime is set at the expiration in step S204.

  In the next step S205, it is determined whether to issue a warning before expiration. If a warning is to be issued, validity is set in step S206. If no warning is given, invalidity is set in step S207.

  In step S208, it is determined whether or not to issue a warning at the time of expiration. When warning is performed, “valid” is set in step S209. If no warning is given, invalidity is set in step S210.

  In the next step S211, it is determined whether or not to issue a warning when an RA is received from an unregistered router. If a warning is to be issued, validity is set in step S212. If no warning is given, invalidity is set in step S213.

  In the next step S214, it is determined whether or not to issue a warning when addresses overlap. In the case of performing warning, it is set in which address to perform warning in steps S215 to 220, and the process proceeds to step S221. The addresses shown in steps S215 to 220 are various addresses in IPv6. If no warning is given, invalidity is set in step S213, and the process proceeds to step S221.

  In step S221, it is determined whether to issue a warning when the default gateway is changed. If a warning is to be issued, validity is set in step S222. If no warning is given, invalidity is set in step S223.

  In the next step S224, a setting for warning output for the lifetime time of RA is determined. The warning about the lifetime time of RA is a warning generated when an RA having a lifetime shorter than a predetermined time is received. If the length of time for outputting the warning is not set, the predetermined time is set as a default value in step S225. When setting the length of time, the predetermined time is set by the user in step S226.

  In the above-described processing, in the warning of the expiration date of the stateless address, it is possible to select whether or not to notify the user of a warning message when the preferred lifetime and valid lifetime expire, respectively. As a result, the user can grasp the time during which the stateless address used by the user cannot be used.

  If RA reception from an unregistered router is valid, the user is notified when an RA from an unregistered router is received. This makes it possible to grasp that a router has been added to the network to which the user belongs, or that a device impersonating the router and sending the RA illegally exists on the network to which the user belongs. it can.

  The operation when changing the default gateway will be described. Although there is only one default gateway set in the communication device, in IPv6, a router that can be the default gateway is held in the default router list. When the reachability of the currently set default gateway cannot be confirmed, the default gateway currently set in the OS is selected from the default router list and set. In other words, changing the default gateway is considered to be an abnormality in the router and network configuration of the own network. By notifying the user of the above state, the user can grasp the state of the own network.

  In the warning output based on the RA lifetime time, a warning is displayed if the RA length received from the router is less than a certain time. Thereby, it is possible to prevent an address having a short lifetime from being generated due to impersonation or the like.

  3 and 4 is held in the user setting holding table 13 in the user setting holding stage performed in the flowchart. Based on the content held in the user setting holding table 13, a setting control step for controlling the operation at the time of communication is executed based on the determination at the time of the communication through the determination step for determining the operation at the time of communication. .

  The warnings described above are displayed on the operation panel of the communication device. FIG. 5 shows an operation panel display example.

  Display example 20 is a warning display screen before expiration of preferred lifetime. The date and time when the preferred lifetime expires and its address are displayed.

  The display example 21 is a warning display screen when a preferred lifetime expires. The date and time when the preferred lifetime expires and its address are displayed.

  Display example 22 is a warning display screen before expiration of valid lifetime. The date and time when the valid lifetime expires and its address are displayed.

  The display example 23 is a warning display screen when the valid lifetime expires. The date and time when the valid lifetime expires and its address are displayed.

  Display example 24 is a warning display screen when addresses overlap. The duplicate address type (stateless address in the figure) and address are displayed.

  The display example 25 is a warning screen when changing the default gateway. The changed default gateway address is displayed.

  Display example 26 is an RA lifetime time warning display screen. The lifetime time, the address of the device that transmitted the RA, and the prefix are displayed.

  The above is a display example. When a plurality of warnings occur at once, the warning display is changed according to the display priority set by the user (or the display priority recommended by the device).

  Note that warning messages and past display messages that could not be displayed at one time are held inside the device, and can be referred to whenever the user wants to refer. Thereby, the user can always grasp the abnormal state that has occurred in the own device or the own network.

It is a figure which shows the structure by which the network apparatus with which communication is performed was connected. It is a figure which shows a software module structure. It is a flowchart which shows the process regarding a setting. It is a flowchart which shows the warning display setting process. It is a figure which shows the example of a display.

Explanation of symbols

1, 2 router 3, 4, 5 communication device 6 network 10 application 11 network control unit 12 OS
13 User setting holding table 14 User option determining unit 15 Network setting control unit 16 Network information monitoring unit 17 Network protocol 18 Network communication driver 20, 21, 22, 23, 24, 25, 26 Display example

Claims (25)

In a communication device that communicates with IPv6,
User setting holding means for holding user settings relating to operations during communication;
Determination means for determining an operation during communication based on the contents held in the user setting holding means;
A communication device comprising: setting control means for controlling operation during communication based on the determination by the determination means. The communication apparatus according to claim 1, wherein the setting is a lifetime length of a stateless address. The communication device according to claim 1, wherein the setting is an IP address of a router that transmits a router advertisement. The communication device according to any one of claims 1 to 3, wherein the setting is an IP address of a default gateway. The communication apparatus according to claim 1, wherein the setting is an IP address of a router that can be a default gateway. 6. The communication apparatus according to claim 1, wherein the setting is a warning display setting as to whether or not the setting control unit displays a warning regarding communication to a user. The communication device according to claim 6, wherein the warning display setting is a setting for warning that an IP address becomes invalid. The communication device according to claim 6 or 7, wherein the warning display setting is a setting for warning that an IP address has expired. The communication device according to any one of claims 6 to 8, wherein the warning display setting is a setting for warning that a router advertisement has been received from a router that is not registered by a user. The communication device according to any one of claims 6 to 9, wherein the warning display setting is a setting for warning that an IP address is duplicated. The communication device according to any one of claims 6 to 10, wherein the warning display setting is a setting for warning that a default gateway has been changed. The communication device according to any one of claims 6 to 11, wherein the warning display setting is a setting for warning that the lifetime length provided by the router advertisement is shorter than a predetermined value. A communication method in a communication device that performs communication using IPv6,
A setting stage in which the user performs settings related to the operation during communication;
A user setting holding step for holding the contents set in the setting step;
A determination step of determining an operation during communication based on the content held in the user setting holding step;
And a setting control step for controlling operation during communication based on the determination in the determination step. The communication method according to claim 13, wherein the setting is a lifetime length of a stateless address. 15. The communication method according to claim 13, wherein the setting is an IP address of a router that transmits a router advertisement. The communication method according to any one of claims 13 to 15, wherein the setting is an IP address of a default gateway. The communication method according to claim 13, wherein the setting is an IP address of a router that can be a default gateway. The communication method according to any one of claims 13 to 17, wherein the setting is a warning display setting as to whether or not the setting control stage displays a warning regarding communication to a user. The communication method according to claim 18, wherein the warning display setting is a setting for warning that an IP address becomes invalid. The communication method according to claim 18 or 19, wherein the warning display setting is a setting for warning that an IP address has expired. 21. The communication method according to claim 18, wherein the warning display setting is a setting for warning that a router advertisement has been received from a router not registered by a user. The communication method according to any one of claims 18 to 21, wherein the warning display setting is a setting for warning that an IP address is duplicated. 23. The communication method according to claim 18, wherein the warning display setting is a setting for warning that a default gateway has been changed. The communication method according to any one of claims 18 to 23, wherein the warning display setting is a setting for warning that the lifetime length provided by the router advertisement is shorter than a predetermined value. A communication program for causing a computer to execute the communication method according to any one of claims 13 to 24.

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