JP2008109379A - IP terminal equipment - Google Patents

Abstract

Communication can be continued without interrupting a session even if duplicate IP address settings occur.
A first partner-side MAC address storage unit for storing a first partner-side MAC address received from the partner at the start of a session with the partner, and an ARP packet addressed to the partner IP address are transmitted. An ARP communication unit 23 that receives an ARP packet or an ARP response addressed to the IP address on the side, a second partner MAC address storage unit 25 that stores a second partner MAC address mounted in the ARP response received from the partner, When the first partner MAC address is different from the second partner MAC address, the IP address duplication setting judgment unit 26 judges that the IP address duplication setting has occurred, and if it is judged that the IP address duplication setting has occurred, the first A packet sorting unit 12 that discards packets originating from a MAC address other than the counterpart MAC address.
[Selection] Figure 1

Description

  The present invention relates to an IP terminal device that is an IP network device such as an IP phone, an IP videophone, and an IP door phone device that establishes a session with a counterpart terminal using, for example, a MAC address and an IP address on an IP network.

  Conventionally, as an IP network device of such an IP terminal device, an IP address is individually set on the IP network, and a session with a counterpart terminal is established using this IP address. When the same IP address duplication setting as that of the own terminal occurs due to an incorrect IP address setting operation in the other IP terminal device above, assuming that the IP network device is applied to an IP telephone for voice communication, for example, dialing is not possible, call voice Deterioration of the phone, forced disconnection of the call, etc. occur, and various normal operations are hindered.

  Therefore, in order to cope with such a situation, in an IP telephone that realizes voice communication on an IP network, an IP address collision detection function that quickly detects the occurrence of an operation abnormality due to an IP address collision (duplication), and this When a collision (duplication) of an IP address is detected through an IP address collision detection function, there is known one having a collision notification function for notifying a user of this IP address collision (see, for example, Patent Document 1).

  If the IP phone of Patent Document 1 transmits an ARP packet addressed to its own IP address to the IP network through the IP address collision detection function and does not receive an ARP response to this ARP packet, the IP address duplication setting When it is determined that no IP address has occurred and an ARP response to the ARP packet is received, the occurrence of an IP address duplication setting is detected, and an IP address collision (occurrence of an IP address duplication setting) is displayed through the collision notification function. Display output.

Therefore, according to the IP telephone of Patent Document 1, when the occurrence of IP address duplication setting is detected through the IP address collision detection function, it is displayed on the display unit of its own terminal in order to notify the occurrence of this IP address duplication. Therefore, the user on the IP telephone (own terminal) side can recognize the occurrence of the IP address duplication setting of the own terminal by viewing the display content on the display unit.
JP 2003-78526 A (see abstract and FIG. 2)

  However, according to the IP terminal device such as the IP telephone set disclosed in Patent Document 1, when the occurrence of the duplicate IP address setting is detected through the IP address collision detection function, the display unit of the terminal itself is notified to notify the occurrence of the duplicate setting. The IP terminal manager or user manually changed the IP address of the terminal to a new IP address to eliminate the duplicate IP address setting based on the display content of the display unit. Setting work is required.

  Further, according to the IP terminal device of Patent Document 1, for example, when the occurrence of an IP address duplication setting is detected during a call with a counterpart terminal (during a session), the IP address of the own terminal is manually changed to call voice. However, when changing the IP address of the terminal itself, the call must be interrupted and the continuity of the call cannot be maintained. In addition, during the call (during a session), even if the occurrence of duplicate IP address settings is detected, it may be possible not to manually change the IP address of the terminal itself. The user cannot continue the call normally due to the forced disconnection of the call.

  The present invention has been made in view of the above points, and an object of the present invention is to perform communication without interrupting a session without requiring an IP address setting change operation even when duplicate IP address settings occur. It is to provide an IP terminal device capable of continuing.

  In order to achieve the above object, the IP terminal device of the present invention transmits its own MAC address to the partner terminal at the start of a session with the partner terminal on the IP network, and from the partner terminal to the partner terminal side. MAC address communication means for receiving the MAC address of the other party, receiving the MAC address of the counterpart terminal through the MAC address communication means, first counterpart MAC address storage means for storing the MAC address of the counterpart terminal, When repeatedly transmitting an ARP packet addressed to the IP address of the counterpart terminal, and receiving an ARP packet from the counterpart terminal through the ARP communication means, an ARP communication means receiving the ARP packet or ARP response addressed to its own IP address, The ARP packet is loaded with its own MAC address and the ARP An ARP response means for returning an ARP response to the packet, a second counterpart MAC address storage means for storing an installed MAC address in the received ARP response when the ARP response is received through the ARP communication means, and the first counterpart When the MAC address stored in the MAC address storage means is compared with the MAC address stored in the second counterpart MAC address storage means, if these MAC addresses are different, the same as the counterpart terminal on the IP network An IP address duplication determination unit that determines that an IP address is set to be duplicated, and an IP address duplication judgment unit that determines that the same IP address as that of the counterpart terminal is duplicated. 1 MAC address other than the MAC address stored in the MAC address storage means Even packet was received in signal source, and to have a discarding packet sorting unit of the same packet.

  According to the IP terminal apparatus of the present invention configured as described above, the MAC address of the counterpart terminal received at the start of the session stored in the first counterpart MAC address storage means, and the second counterpart MAC address storage means Are compared with the MAC addresses obtained at the time of receiving the ARP response stored in the network, and if these MAC addresses are different, it is determined that the same IP address as that of the counterpart terminal is set on the IP network. 1 Even if a packet with a MAC address other than the MAC address stored in the other party's MAC address storage means is received, the packet is discarded. That is, the MAC address received at the start of the session is used as the source. So that only IP packets that have been received will be received. Without requiring the setting change operation for less, it is possible to continue communication without interrupting the session.

  The IP terminal device according to claim 1 transmits a MAC address of its own side to the counterpart terminal at the start of a session with the counterpart terminal on the IP network, and the MAC address of the counterpart terminal side from the counterpart terminal MAC address communication means for receiving the MAC address of the counterpart terminal through the MAC address communication means, a first counterpart MAC address storage means for storing the MAC address of the counterpart terminal, and the counterpart terminal When the ARP packet addressed to the IP address is repeatedly transmitted, the ARP communication means for receiving the ARP packet addressed to the own IP address or the ARP response, and the ARP packet is received from the counterpart terminal through the ARP communication means, the ARP packet With its own MAC address and ARP response means for sending back an ARP response, and when receiving the ARP response through the ARP communication means, the second counterpart MAC address storage means for storing the MAC address mounted in the received ARP response, and the first counterpart side When the MAC address stored in the MAC address storage means and the MAC address stored in the second counterpart MAC address storage means are compared, and these MAC addresses are different, the same IP address as the counterpart terminal on the IP network If the IP address duplication determination unit determines that the address is set to be duplicated, and the IP address duplication determination unit determines that the same IP address as the counterpart terminal is duplicated, the first address MAC address other than the MAC address stored in the other party's MAC address storage means Even when receiving the packet, and to have a discarding packet sorting unit of the same packet.

  Therefore, according to the IP terminal device according to claim 1 of the present application, the MAC address of the counterpart terminal received at the start of the session stored in the first counterpart MAC address storage means and the second counterpart MAC address storage means are stored. The MAC address obtained when the ARP response is received, and if these MAC addresses are different, it is determined that the same IP address as that of the counterpart terminal is set on the IP network, and the first counterpart Even if a packet with a MAC address other than the MAC address stored in the MAC address storage means is received, the packet is discarded, that is, a packet with the MAC address received at the start of the session as the source Even if the IP address duplication setting occurs on the partner terminal side, Without requiring the setting change operation of the IP address is the own terminal and the mating terminal, communication can be continued without interrupting the session.

  Further, the IP terminal device according to claim 2 of the present application transmits a MAC address of its own side to the partner terminal at the start of a session with the partner terminal on the IP network, and at the partner terminal side from the partner terminal A MAC address communication means for receiving the MAC address; a first counterpart MAC address storage means for storing the MAC address of the counterpart terminal when receiving the MAC address of the counterpart terminal through the MAC address communication means; and the counterpart When the ARP packet addressed to the IP address of the terminal is repeatedly transmitted, the ARP communication means for receiving the ARP packet addressed to the local IP address or the ARP response, and the ARP packet from the partner terminal through the ARP communication means, The ARP packet is loaded with its own MAC address. An ARP response means for returning an ARP response to the second ARP response means, a second counterpart MAC address storage means for storing an installed MAC address in the received ARP response when the ARP response is received through the ARP communication means, and the first counterpart side When the MAC address stored in the MAC address storage means and the MAC address stored in the second counterpart MAC address storage means are compared, and these MAC addresses are different, the same IP address as the counterpart terminal on the IP network When the IP address duplication determination unit determines that the address is set to be duplicated, and the IP address duplication determination unit determines that the same IP address as that of the counterpart terminal is duplicated, the second Receive a packet with the MAC address stored in the MAC address storage means Even were to have a discarding packet sorting unit of the same packet.

  Therefore, according to the IP terminal device according to claim 2 of the present application, the MAC address of the counterpart terminal received at the start of the session stored in the first counterpart MAC address storage means and the second counterpart MAC address storage means are stored. The MAC addresses obtained at the time of receiving the ARP response, and if these MAC addresses are different, it is determined that the same IP address as that of the counterpart terminal is set on the IP network, and the second counterpart Even if a packet whose source is the MAC address stored in the MAC address storage means is received, the packet is discarded, that is, from another device in which the same IP address as that of the partner terminal is duplicated. Since the packet is not received, even if the duplicate setting of the IP address occurs on the partner terminal side, On the side, without requiring the setting change operation of the IP address, communication can be continued without interrupting the session.

  In addition, the IP terminal device according to claim 3 of the present application includes a self-terminal MAC address storage means for storing a MAC address of the self-side for establishing a session with the counterpart terminal on the IP network, and a self-addressed IP address. The ARP packet is repeatedly transmitted, and the ARP communication means for receiving the ARP packet addressed to the own IP address or the ARP response, and the ARP packet is received through the ARP communication means, the MAC address of the own side is mounted on the ARP packet. Then, when receiving an ARP response through the ARP communication means, an ARP response means for returning an ARP response to the ARP packet, a reception response MAC address storage means for storing a built-in MAC address in the received ARP response, and this reception MAC address currently stored in response MAC address storage means and previous IP address duplication determination in which the MAC address stored in the own terminal MAC address storage means is compared, and if these MAC addresses are different, it is judged that the same IP address as that of the own terminal is set on the IP network. And the IP address duplication determination means, if it is determined that the same IP address as that of the own terminal is duplicated, the IP address duplication mounting the MAC address stored in the reception response MAC address storage means IP address duplication notification means for notifying the partner terminal of the notification, IP address duplication reception means for receiving the IP address duplication notification through the IP address duplication notification means on the counterpart terminal side, and the partner terminal side through the IP address duplication reception means When the IP address duplication notification is received, the IP address duplication notification is Even when receiving a packet in which the MAC address to the originating and to have a discarding packet sorting unit of the same packet.

  Therefore, according to the IP terminal device of claim 3 of the present application, the MAC address of the own side is stored in the own terminal MAC address storage means, and the ARP packet addressed to the IP address of the own side is transmitted on the IP network, When the ARP response to the ARP packet is received, the MAC address mounted in the received ARP response is stored in the reception response MAC address storage means, and the MAC address stored in the own terminal MAC address storage means and the reception response MAC address storage means If these MAC addresses are different, it is determined that the same IP address as that of the own terminal is set on the IP network and stored in the reception response MAC address storage means. In addition to notifying the other terminal of the IP address duplication notification equipped with the MAC address inside When the IP address duplication notification is received from the IP address duplication notification means on the partner terminal side, the packet is discarded even if a packet with the MAC address installed in the IP address duplication notification is received, that is, Packets from other devices with the same IP address as the counterpart terminal are not received, so even if the same IP address is duplicated on the own terminal side, the own terminal and the counterpart terminal side Communication can be continued without interrupting the session without requiring an IP address setting change operation.

  In addition, the IP terminal device according to claim 4 of the present application includes a self-terminal MAC address storage unit that stores a MAC address on its own side for establishing a session with the counterpart terminal on the IP network, and a session with the counterpart terminal. MAC address communication means for transmitting the MAC address of the partner terminal side to the partner terminal and receiving the MAC address of the partner terminal side from the partner terminal, and the MAC address of the partner terminal side through the MAC address communication means , Repeatedly transmits the ARP packet addressed to its own IP address and the ARP packet or ARP response addressed to its own IP address. ARP communication means to receive and receive ARP packets through this ARP communication means Then, when receiving the ARP response through the ARP communication means, the ARP response means for mounting the own MAC address in the ARP packet and returning the ARP response to the ARP packet, the MAC mounted in the received ARP response is received. When the MAC address stored in the reception response MAC address storage unit is compared with the MAC address stored in the reception response MAC address storage unit and the MAC address stored in the own terminal MAC address storage unit, and these MAC addresses are different An IP address duplication determination unit that determines that the same IP address as that of the own terminal is set on the IP network, and the same IP address as that of the own terminal is set by the IP address duplication determination unit. IP address duplication notification to the partner terminal IP address duplication notification means for receiving, IP address duplication reception means for receiving IP address duplication notification through the IP address duplication notification means on the counterpart terminal side, and IP address duplication notification on the counterpart terminal side through the IP address duplication reception means When receiving a packet having a MAC address other than the MAC address stored in the counterpart MAC address storing means, the packet selecting means for discarding the packet is provided.

  Therefore, according to the IP terminal device according to claim 4, the MAC address of the own terminal is stored in the own terminal MAC address storage means, and the MAC address of the counterpart terminal received at the start of the session is stored in the counterpart MAC address. When the ARP packet addressed to its own IP address is transmitted to the IP network and the ARP response to the ARP packet is received, the MAC address installed in the received ARP response is stored in the reception response MAC address storage unit. The MAC address stored in the own terminal MAC address storage means and the MAC address stored in the reception response MAC address storage means are compared, and if these MAC addresses are different, the same as the own terminal on the IP network Judge that IP address is duplicated, and send IP address duplicate notification When notifying the hand terminal and receiving the IP address duplication notification through the IP address duplication notification means on the counterpart terminal side, a packet originating from a MAC address other than the MAC address stored in the counterpart MAC address storage means is sent. Even if it is received, the same packet is discarded, that is, only the packet that originates from the MAC address of the partner terminal received at the start of the session is received. Even if it occurs, it is possible to continue the communication without interrupting the session without requiring an IP address setting change operation on the own terminal and the partner terminal side.

  Hereinafter, an IP network system showing an embodiment related to an IP terminal device of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of the entire IP network system according to the first embodiment.

  An IP network system 1A shown in FIG. 1 has a configuration in which a plurality of IP terminals 3 are communicatively connected through an IP network 2, and each IP terminal 3 has a network interface unit (hereinafter simply referred to as a network) that controls a communication interface with the IP network 2. (Referred to as IF section) 11, packet sorting section 12 for transmitting / receiving packets such as voice packets to / from other IP terminals 3 via IP network 2, handset 13 for realizing voice call, and voice call through handset 13. Alternatively, a voice processing unit 14 that controls processing for decoding voice packets, an operation unit 15 that inputs various commands such as a call operation and a call operation, and a voice call in response to a call control command input from the operation unit 15 Communication control related to the IP network 2 and the call control unit 16 that controls the function call control That a network control unit 17, and an address setting processing unit 18A for controlling operation according to the first address setting process to be described later. Each IP terminal 3 is, for example, an IP network device such as an entrance slave unit arranged outside the entrance of a general house or an indoor master unit arranged indoors and connected to the entrance slave unit. For example, in addition to IP telephones and IP video telephones, there are IP network devices that do not have a voice call function such as network games that operate on a PC.

  The address setting processing unit 18A is a processing unit for detecting the duplicate setting of the IP address assigned to each IP terminal 3 on the IP network 2 and eliminating the influence of the duplicate IP address setting. When starting a session (call) between the IP terminals 3 (the local terminal 3A and the counterpart terminal 3B), the MAC address of the local side is transmitted to the counterpart terminal 3B, and the counterpart terminal 3B A MAC address communication unit 21 that receives a MAC address, and a first MAC address that stores the MAC address on the partner terminal 3B side as a first partner MAC address when the MAC address on the partner terminal 3B side is received through the MAC address communication unit 21 The other party's MAC address storage unit 22 and A addressed to the IP address of the other terminal 3B with respect to the IP network 2 When the P packet is repeatedly broadcast and sent, the ARP communication unit 23 receiving the ARP packet or ARP response addressed to the own IP address, and the ARP packet addressed to the own IP address through the ARP communication unit 23, When the ARP response is received through the ARP communication unit 23, and the ARP response unit 24 that returns the ARP response to the ARP packet to the source of the ARP packet by mounting the MAC address of the own side in the ARP packet, the received ARP response The second partner MAC address storage unit 25 that stores the MAC address mounted on the second partner MAC address as the second partner MAC address, and the first partner MAC address and the second partner side stored in the first partner MAC address storage unit 22 Compared with the second partner MAC address stored in the MAC address storage unit 25 If these MAC addresses are different, an IP address duplication setting judgment unit that judges that the same IP address as that of the counterpart terminal 3B on the IP network 2 is duplicated in the other IP terminal 3 (other terminal 3C). 26. Of the IP terminals 3, it is assumed that the own terminal 3A and the partner terminal 3B have a voice call function (peer-to-peer real-time communication function), but the other terminals 3C of the IP terminal 3 have a voice call function. Of course, it is not necessary to have this.

  For example, if the IP address duplication setting determination unit 26 determines that the same IP address as that of the counterpart terminal 3B is duplicated, the packet selection unit 12 on the own terminal 3A side first MAC address storage unit Even if a packet having a MAC address other than the first counterpart MAC address stored in 22 is received, the packet selection content is updated to discard the packet.

  The IP terminal device according to claim 1 is an IP terminal 3 (own terminal 3A, a partner terminal 3B and another terminal 3C), an IP network is an IP network 2, a partner terminal is a partner terminal 3B, and a MAC address communication means is a MAC address. The communication unit 21, the first counterpart MAC address storage means is the first counterpart MAC address storage section 22, the ARP communication means is the ARP communication section 23, the ARP response means is the ARP response section 24, and the second counterpart MAC address storage means is The second counterpart MAC address storage unit 25, the IP address duplication determination unit corresponds to the IP address duplication setting determination unit 26, and the packet selection unit corresponds to the packet selection unit 12.

  Next, the operation of the IP network system 1A showing the first embodiment will be described. FIG. 2 is a flowchart showing the processing operation related to the first address setting process inside the terminal 3A.

  The first address setting process shown in FIG. 2 eliminates the influence of the IP address duplication setting on the own terminal 3A side even if the IP address duplication setting occurs on the counterpart terminal 3B side during the session (call) with the counterpart terminal 3B. However, this is a process for setting and updating the packet selection content of the packet selection unit 12 on the own terminal 3A side in order to continue the call with the counterpart terminal 3B.

  In FIG. 2, the own terminal 3A determines whether or not a session (call) with the partner terminal 3B is started via the IP network 2 (step S11).

  When it is determined that the session with the partner terminal 3B is started, the MAC address communication unit 21 on the terminal 3A side transmits the MAC address of the host terminal 3B to the partner terminal 3B via the IP network 2, and the partner terminal The MAC address on the partner terminal 3B side is received from 3B (step S12).

  When the MAC address communication unit 21 on the own terminal 3A side receives the MAC address on the partner terminal 3B side, the MAC address communication unit 21 stores the MAC address in the first partner MAC address storage unit 22 as the first partner MAC address (step S13). .

  The ARP communication unit 23 on the own terminal 3A side broadcasts the ARP packet addressed to the IP address of the partner terminal 3B to the IP network 2 (step S14). When receiving the ARP packet addressed to its own IP address via the IP network 2, the ARP response unit 24 on the partner terminal 3B side mounts its own MAC address on the ARP packet within a predetermined time. An ARP response is returned to the source of the ARP packet.

  The ARP communication unit 23 on the own terminal 3A side determines whether or not an ARP response to the ARP packet has been received within a predetermined time after the ARP packet is broadcast (step S15).

  When it is determined that the ARP communication unit 23 on the own terminal 3A side has received the ARP response through the IP network 2, the second partner MAC address is stored as the second partner MAC address in the ARP response. The data is stored in the unit 25 (step S16).

  The IP address duplication setting determining unit 26 on the own terminal 3A side stores the first partner MAC address stored in the first partner MAC address storage unit 22 and the second partner stored in the second partner MAC address storage unit 25. The side MAC addresses are compared (step S17), and it is determined whether these MAC addresses are different (step S18).

  If it is determined that the MAC address is different, the IP address duplication setting determination unit 26 on the own terminal 3A side sets the same IP address as that of the counterpart terminal 3B on the IP network 2, that is, the IP address duplication setting is performed. It is determined that it has occurred (step S19).

  When the IP address duplication setting judgment unit 26 determines that the IP address duplication has occurred, the packet sorting unit 12 on the own terminal 3A side, except for the first counterpart MAC address stored in the first counterpart MAC address storage unit 22 The packet selection content is set and updated so as to discard the packet having the source MAC address as the source (step S20).

  As a result, the packet sorting unit 12 discards the packet even if it receives a packet originating from a MAC address other than the first counterpart MAC address based on the updated packet sort contents, and sets the first counterpart MAC Only packets with the address as the source will be received.

  Further, when the terminal 3A sets and updates the packet selection content in step S20, it determines whether or not the call with the partner terminal 3B is terminated (step S21).

  When it is determined that the call with the counterpart terminal 3B has ended, the own terminal 3A ends the processing operation related to the first address setting process.

  In addition, if the terminal 3A does not start a session (call) with the counterpart terminal 3B in step S11, the terminal 3A similarly ends this processing operation.

  Further, if the ARP communication unit 23 on the own terminal 3A side does not receive the ARP response within the predetermined time in step S15, the ARP communication unit 23 proceeds to step S21 to monitor whether or not the call with the partner terminal 3B is terminated. Transition.

  Also, the IP address duplication setting determination unit 26 on the own terminal 3A side determines that there is no IP address duplication setting when the first counterpart MAC address and the second counterpart MAC address are the same in step S18. Then, the process proceeds to step S21 in order to monitor whether or not the call with the partner terminal 3B is terminated.

  If the call with the partner terminal 3B is not terminated in step S21, the terminal 3A moves to step S14 in order to broadcast the ARP packet addressed to the IP address of the partner terminal 3B.

  FIG. 3 is a sequence diagram briefly showing operations of the own terminal 3A, the partner terminal 3B, and the other terminal 3C related to the first address setting process. For convenience of explanation, the MAC address of the terminal 3A is MAC-A, the MAC address of the partner terminal 3B is MAC-B, the MAC address of the other terminal 3C is MAC-C, and the partner terminal 3B and the other terminal 3C Assume that the IP addresses are the same (Addr-B).

  After receiving the INVITE corresponding to the call command from the partner terminal 3B via the IP network 2 (Step S31), the terminal 3A returns an OK response to the call command to the partner terminal 3B and makes a session (call). It will start (step S32).

  Next, the counterpart terminal 3B notifies its own MAC address (MAC-B) to the own terminal 3A via the IP network 2 (step S33), and the own terminal 3A receives its own MAC address via the IP network 2. (MAC-A) is notified to the counterpart terminal 3B (step S34). The first partner MAC address storage unit 22 on the partner terminal 3B side stores the MAC address (MAC-A) on the own terminal 3A side as the first partner MAC address, and the first partner side on the own terminal 3A side. The MAC address storage unit 22 stores the MAC address (MAC-B) on the counterpart terminal 3B side as the first counterpart MAC address.

  Next, when the counterpart terminal 3B and the own terminal 3A store the other party's MAC address, they transmit and receive voice packets via the IP network 2 (steps S35 and S36), and the voice between the counterpart terminal 3B and the own terminal 3A. A call will be established.

  When the ARP communication unit 23 on the own terminal 3A side broadcasts the ARP packet addressed to the IP address (Addr-B) of the partner terminal 3B to the IP network 2 (step S37), the partner terminal 3B naturally Although the ARP response to the ARP packet is received, since the other terminal 3C has the same IP address (Addr-B) as the counterpart terminal 3B, the ARP response to the ARP packet is also received from the other terminal 3C. (Step S38).

  When receiving the ARP response from the other terminal 3C, the ARP communication unit 23 on the own terminal 3A side stores the second counterpart MAC address using the MAC address (MAC-C) installed in the ARP response as the second counterpart MAC address. Stored in the unit 25.

  However, the IP address duplication setting determination unit 26 on the own terminal 3 </ b> A side stores the first partner MAC address (MAC-B) stored in the first partner MAC address storage unit 22 and the second partner MAC address storage unit 25. Compared with the second counterpart MAC address (MAC-C) stored in the packet, and since these MAC addresses are different, a packet having a MAC address other than the first counterpart MAC address (MAC-B) as a source is received. Even so, the packet selection content of the packet selection unit 12 on the terminal 3A side is set and updated so that the packet is discarded.

  As a result, the packet sorting unit 12 on its own terminal 3A side, based on the packet sorting content that has been updated, sets a packet originating from the MAC address (MAC-C) of the other terminal 3C, for example, BYE corresponding to a disconnect command. Even if the packet is received, the packet is discarded (step S39), a voice packet is transmitted to the counterpart terminal 3B (step S40), and the packet with the MAC address (MAC-B) of the counterpart terminal 3B as a source, for example, A voice packet and a packet such as BYE are received (steps S41 and S42).

  Therefore, according to the first embodiment, the MAC address on the partner terminal 3B side received at the start of the session (call) with the partner terminal 3B is stored as the first partner MAC address, and addressed to the IP address of the partner terminal 3B. After the ARP packet is broadcasted, an ARP response to the ARP packet is received within a predetermined time, and the MAC address installed in the ARP response is stored as the second counterpart MAC address. 2 If the other party's MAC address is different, the packet of the packet sorting unit 12 on the own terminal 3A side is discarded so that the packet is discarded even if a packet having a MAC address other than the first party's MAC address is received. Since the selection contents are set and updated, the IP address is sent to the partner terminal 3B side on the IP network 2. Even duplicate set is generated, at its own terminal 3A and the mating terminal 3B side, without requiring the setting change operation of the IP address, communication can be continued without interruption session (call).

(Embodiment 2)
Next, an IP network system 1B showing a second embodiment will be described. FIG. 4 is a block diagram showing a schematic configuration inside the IP network system 1B according to the second embodiment. The same components as those in the IP network system 1A shown in FIG. 1 are denoted by the same reference numerals, and the description of the overlapping components and operations is omitted.

  The difference between the IP network system 1B shown in FIG. 4 and the IP network system 1A shown in FIG. 1 is that the first partner MAC address and the second partner MAC address in the IP address duplication setting determination unit 26 inside the IP terminal 3 Is different from that of the first partner MAC address, instead of discarding the packet originating from the MAC address other than the first counterpart MAC address, the terminal 3A itself discards the packet originating from the second counterpart MAC address. The address setting processing unit 18B sets and updates the packet selection content of the packet selection unit 12 on the side.

  The address setting processing unit 18B inside the IP terminal 3 shown in FIG. 4 includes a MAC address communication unit 21, a first counterpart MAC address storage unit 22, an ARP communication unit 23, an ARP response unit 24, and a second counterpart MAC address storage unit. 25 and the IP address duplication setting determination unit 26, and when the IP address duplication setting judgment unit 26 has a different MAC address from the first partner MAC address, the MAC address of the second partner is set as the source. In order to discard the packet, the packet selection content of the packet selection unit 12 is updated.

  The IP terminal device according to claim 2 is an IP terminal 3 (own terminal 3A, a partner terminal 3B and another terminal 3C), an IP network is an IP network 2, a partner terminal is a partner terminal 3B, and a MAC address communication means is a MAC address. The communication unit 21, the first counterpart MAC address storage means is the first counterpart MAC address storage section 22, the ARP communication means is the ARP communication section 23, the ARP response means is the ARP response section 24, and the second counterpart MAC address storage means is The second counterpart MAC address storage unit 25, the IP address duplication determination unit corresponds to the IP address duplication setting determination unit 26, and the packet selection unit corresponds to the packet selection unit 12.

  Next, the operation of the IP network system 1B showing the second embodiment will be described. FIG. 5 is a flowchart showing processing operations related to the second address setting process of the own terminal 3A according to the second embodiment.

  The second address setting process shown in FIG. 5 eliminates the influence of the IP address duplication setting on the own terminal 3A side even if the IP address duplication setting occurs on the counterpart terminal 3B side during the session (call) with the counterpart terminal 3B. On the other hand, in order to continue the call with the partner terminal 3B, a process for setting and updating the packet selection content of the packet selection unit 12 on the own terminal 3A side, This is a process for setting and updating the packet selection content of the packet selection unit 12 on the own terminal side so that the packet is discarded even if the packet having the source MAC address as the transmission source is received.

  In FIG. 5, the own terminal 3 </ b> A executes the processing operations of steps S <b> 11 to S <b> 19, and then the first partner MAC address and the second partner MAC address are different through the IP address duplication setting determination unit 26 in step S <b> 19. The packet selection content of the packet selection unit 12 is set and updated so as to discard the packet originating from the second counterpart MAC address (step S20A), and monitoring whether or not the call with the counterpart terminal 3B has ended. Therefore, the process proceeds to step S21.

  As a result, the packet sorting unit 12 on the own terminal 3A side discards the packet even if it receives a packet originating from the second partner MAC address based on the updated packet sorting contents, A packet whose source is a MAC address other than the MAC address is received.

  FIG. 6 is a sequence diagram briefly showing operations of the own terminal 3A, the partner terminal 3B, and the other terminal 3C related to the second address setting process. For convenience of explanation, the MAC address of the terminal 3A is MAC-A, the MAC address of the partner terminal 3B is MAC-B, the MAC address of the other terminal 3C is MAC-C, and the partner terminal 3B and the other terminal 3C Assume that the IP addresses are the same (Addr-B).

  When the own terminal 3A, the partner terminal 3B, and the other terminal 3C shown in FIG. 6 execute the processing operations of steps S31 to S38, the IP address duplication setting determination unit 26 on the own terminal 3A side The first counterpart MAC address (MAC-B) stored in the storage unit 22 is compared with the second counterpart MAC address (MAC-C) stored in the second counterpart MAC address storage unit 25, and these MACs are compared. Since the addresses are different, the packet selection content of the packet selection unit 12 on the own terminal 3A side is set and updated so that the packet originating from the second counterpart MAC address (MAC-C) is discarded.

  As a result, even if the packet sorting unit 12 on the own terminal 3A side receives a packet originating from the MAC address (MAC-C) of the other terminal 3C, for example, BYE corresponding to the disconnection command, in step S39, discards it. Then, while transmitting a voice packet to the counterpart terminal 3B in step S40, in steps S41 and 42, packets originating from the MAC address (MAC-B) of the counterpart terminal 3B, such as voice packets and BYE A packet will be received.

  Therefore, according to the second embodiment, the MAC address on the partner terminal 3B side received at the start of the session (call) with the partner terminal 3B is stored as the first partner MAC address, and addressed to the IP address of the partner terminal 3B. After the ARP packet is broadcasted, an ARP response to the ARP packet is received within a predetermined time, and the MAC address installed in the ARP response is stored as the second counterpart MAC address. 2 If the other party's MAC address is different, the packet selection content of the packet selection unit 12 on the own terminal 3A side is set so that the packet is discarded even if the packet having the second party's MAC address as the source is received. Since it was updated, IP address duplication setting occurred on the partner terminal 3B side on the IP network 2 Even if, in its own terminal 3A and the mating terminal 3B side, without requiring the setting change operation of the IP address, communication can be continued without interruption session (call).

(Embodiment 3)
Next, an IP network system 1C showing a third embodiment will be described. FIG. 7 is a block diagram showing a schematic configuration inside the IP network system 1C showing the third embodiment. The same components as those in the IP network system 1A shown in FIG. 1 are denoted by the same reference numerals, and the description of the overlapping components and operations is omitted.

  The IP network system 1C shown in FIG. 7 differs from the IP network system 1A shown in FIG. 1 in that its own terminal MAC address is stored in its own terminal 3A, and a session (call) with the other terminal 3B is stored. At the time of start, an ARP packet addressed to the IP address of the own side (own terminal 3A) is broadcasted, an ARP response corresponding to the ARP packet is received within a predetermined time, and the MAC address mounted on the ARP response and the own terminal MAC When the address is different, the IP address duplication notification including the MAC address mounted in the ARP response is notified to the partner terminal 3B, and when the partner terminal 3B receives the IP address duplication notification, the IP address duplication notification is received. Even if a packet with the included MAC address is received, the packet is discarded. In the address setting processing unit 18C for setting update packet sorting contents of the counterpart terminal 3B side of the packet sorting unit 12.

  The address setting processing unit 18C inside the IP terminal 3 shown in FIG. 7 stores its own MAC address for establishing a session (call) with the counterpart terminal 3B on the IP network 2 as the own terminal MAC address. A MAC address storage unit 31; and an ARP communication unit 32 that repeatedly broadcasts an ARP packet addressed to its own IP address to the IP network 2 and receives an ARP packet addressed to its own IP address and an ARP response; When an ARP packet is received through the ARP communication unit 32, an ARP response unit 33 that carries the ARP packet with its own MAC address and returns the ARP response to the source of the ARP packet, and an ARP response through the ARP communication unit 32. Is received, the installed MAC address is added to the received ARP response. , As a reception response MAC address, a reception response MAC address storage unit 34, a reception response MAC address stored in the reception response MAC address storage unit 34, and a local terminal MAC address stored in the local terminal MAC address storage unit 31 If these MAC addresses are different from each other, it is determined that the same IP address as that of its own terminal 3A on the IP network 2 is duplicated in the other IP terminal 3 (other terminal 3C). If the determination unit 35 and the IP address duplication setting determination unit 35 determine that the same IP address as that of the own terminal 3A is set in duplicate, the MAC address stored in the reception response MAC address storage unit 34 is mounted. The IP address duplication notification unit 36 for notifying the counterpart terminal 3B of the IP address duplication notification, and the counterpart terminal 3B side I The IP address duplication receiving unit 37 that receives the IP address duplication notification through the address duplication notification unit 36, and the IP address duplication receiving unit 37 receives the IP address duplication notification, the duplication of the MAC address installed in the IP address duplication notification is performed. It has a duplicate MAC address storage unit 38 that stores it as a MAC address.

  Further, even if the packet sorting unit 12 on the partner terminal 3B side receives a packet originating from the duplicate MAC address stored in the duplicate MAC address storage unit 38, the packet sorter 12 determines the packet selection content to discard the packet. The setting is updated.

  The IP terminal device according to claim 3 is the IP terminal 3 (own terminal 3A, partner terminal 3B and other terminal 3C), the IP network is IP network 2, the partner terminal is partner terminal 3B, and the host terminal MAC address storage means is The own terminal MAC address storage unit 31, the ARP communication unit is the ARP communication unit 32, the ARP response unit is the ARP response unit 33, the reception response MAC address storage unit is the reception response MAC address storage unit 34, and the IP address duplication determination unit is IP address duplication The setting determination unit 35, the IP address duplication notification unit corresponds to the IP address duplication notification unit 36, the IP address duplication reception unit corresponds to the IP address duplication reception unit 37 and the duplication MAC address storage unit 38, and the packet sorting unit corresponds to the packet sorting unit 12. It is.

  Next, the operation of the IP network system 1C showing the third embodiment will be described. FIG. 8 is a flowchart showing a processing operation related to the first address duplication notification process inside the terminal 3A.

  The first address duplication notification process shown in FIG. 8 includes a duplicate setting MAC address (reception response MAC address) when an IP address duplication setting occurs on the own terminal 3A side during a session (call) with the counterpart terminal 3B. This is a process for notifying the other terminal 3B side of the IP address duplication notification.

  In FIG. 8, the own terminal 3A determines whether or not a session (call) with the partner terminal 3B is started via the IP network 2 (step S51).

  When it is determined that the ARP communication unit 32 on the own terminal 3A side has started a session with the counterpart terminal 3B, the ARP packet addressed to the own IP address is broadcast to the IP network 2 (step S52). Then, it is determined whether or not an ARP response to the ARP packet has been received within a predetermined time (step S53).

  When it is determined that the ARP communication unit 32 on the own terminal 3A side has received the ARP response to the ARP packet within a predetermined time, the MAC address installed in the ARP response is used as the reception response MAC address in the reception response MAC address storage unit 34. Store (step S54).

  When the IP address duplication setting determination unit 35 on the own terminal 3A side stores the reception response MAC address in the reception response MAC address storage unit 34, the reception response MAC address stored in the reception response MAC address storage unit 34 and the own terminal MAC address The own terminal MAC address stored in the storage unit 31 is compared (step S55), and it is determined whether or not these MAC addresses are different (step S56).

  If it is determined that the MAC address is different, the IP address duplication setting determination unit 35 on the own terminal 3A side sets the same IP address as that of the own terminal 3A on the IP network 2, that is, the IP address duplication setting is performed. It is determined that it has occurred (step S57), and an IP address duplication notification loaded with the reception response MAC address stored in the reception response MAC address storage unit 34 is notified to the partner terminal 3B through the IP address duplication notification unit 36 (step S58). ), It is determined whether or not the call with the partner terminal 3B is terminated (step S59).

  The own terminal 3A ends this processing operation if the call with the counterpart terminal 3B is ended.

  Also, if the terminal 3A itself has not started a call with the partner terminal 3B in step S51, this processing operation is terminated.

  If the ARP communication unit 32 on the own terminal 3A side does not receive an ARP response within a predetermined time in step S53, the ARP communication unit 32 proceeds to step S59 to monitor whether or not the call with the partner terminal 3B is terminated. Transition.

  The IP address duplication setting determination unit 35 on the own terminal 3A side determines that communication is normally performed when it is determined in step S56 that the reception response MAC address is not different from the own terminal MAC address. Then, the process proceeds to step S59 in order to monitor whether or not the call with the partner terminal 3B is terminated. Further, the ARP communication unit 32 on the own terminal 3A side proceeds to step S52 in order to broadcast the ARP packet addressed to its own IP address unless the call with the partner terminal 3B is terminated in step S59. .

  According to the first address duplication notification process shown in FIG. 8, at the start of a session (call) with the counterpart terminal 3B, an ARP packet addressed to its own IP address is broadcasted to the IP network 2, and then within a predetermined time. When the ARP response to the ARP packet is received and the MAC address installed in the ARP response is stored as the reception response MAC address, and the received terminal MAC address and the reception response MAC address are different, Since the reception response MAC address is mounted on the IP address duplication notification indicating that the same IP address as that of the own terminal 3A is set to be duplicated, the other terminal 3B side notifies the own terminal. Based on the IP address duplication notification from 3A, the IP address duplication setting has occurred on its own terminal 3A side. It can be recognized.

  Next, the processing operation on the partner terminal 3B side that has received the IP address duplication notification from its own terminal 3A in the first address duplication notification process shown in FIG. 8 will be described. FIG. 9 is a flowchart showing a processing operation related to the third address setting process on the counterpart terminal 3B side.

  When the third address setting process shown in FIG. 9 receives the IP address duplication notification from its own terminal 3A, it discards the packet even if it receives a packet originating from the MAC address installed in the IP address duplication notification. In this manner, the packet selection content of the packet selection unit 12 on the partner terminal 3B side is set and updated.

  In FIG. 9, the partner terminal 3B determines whether or not a session (call) with the partner terminal 3A is started (step S61).

  When it is determined that the IP address duplication receiving unit 36 on the partner terminal 3B side has started a session (call) with the partner terminal 3A, the IP address 2 receives IP from the partner terminal 3A via the IP network 2. It is determined whether an address duplication notification has been received (step S62).

  When it is determined that the IP address duplication receiving unit 36 on the partner terminal 3B side has received the IP address duplication notification from the partner terminal 3A, the IP address duplication notification is used as the duplicate MAC address. It stores in the duplicate MAC address storage unit 37 (step S63).

  The packet sorting unit 12 on the partner terminal 3B side sets and updates the contents of the packet sorting so that the packet is discarded even if a packet having the duplicate MAC address stored in the duplicate MAC address storage unit 37 as a source is received. (Step S64).

  The partner terminal 3B determines whether or not the call with the partner terminal 3A is terminated (step S65). The partner terminal 3B ends this processing operation if the call with the partner terminal 3A is terminated. Further, the partner terminal 3B ends this processing operation unless the telephone conversation is started in step S61.

  If the IP address duplication receiving unit 37 on the partner terminal 3B side does not receive the IP address duplication notification from the partner terminal 3A in step S62, the call with the partner terminal 3A ends. In order to monitor whether or not the process has been performed, the process proceeds to step S65.

  In addition, unless the partner terminal 3B ends the call with the partner terminal 3A in step S65, the partner terminal 3B should monitor whether or not the IP address duplication notification is received from the partner terminal 3A. The process proceeds to step S62.

  According to the third address setting process shown in FIG. 9, for example, when the IP address duplication receiving unit 37 on the partner terminal 3B side receives the IP address duplication notification through the IP address duplication notification unit 36 on the own terminal 3A side, this IP address duplication The packet selection content of the packet selection unit 12 on the partner terminal 3B side is stored in the duplicate MAC address storage unit 38 as the duplicate MAC address as the duplicate MAC address and discarded from the packet with the duplicate MAC address as the source. Therefore, even if the IP address duplication setting occurs on the own terminal 3A side, the call with the own terminal 3A is continued without being affected by the IP address duplication setting on the partner terminal 3B side. be able to.

  FIG. 10 is a sequence diagram briefly showing operations of the own terminal 3A, the partner terminal 3B, and the other terminal 3C related to the first address duplication notification process and the third address setting process. For convenience of explanation, the MAC address of the own terminal 3A is MAC-A, the MAC address of the partner terminal 3B is MAC-B, the MAC address of the other terminal 3C is MAC-C, and the own terminal 3A and the other terminal 3C Assume that the IP addresses are the same (Addr-A).

  After transmitting INVITE corresponding to the call command via the IP network 2 (Step S71) and receiving an OK response to INVITE from the partner terminal 3B (Step S72), the own terminal 3A starts a session (call). become.

  Next, the local terminal 3A and the partner terminal 3B transmit and receive voice packets via the IP network 2 (steps S73 and S74), thereby establishing a voice call between the partner terminal 3B and the host terminal 3A.

  Further, when the ARP communication unit 32 on the own terminal 3A side broadcasts the ARP packet addressed to the own IP address to the IP network 2 (step S75), the other terminal 3C and the own terminal 3A are the same. Since it is an IP address (Addr-A), an ARP response to the ARP packet is received from the other terminal 3C (step S76).

  When receiving the ARP response from the other terminal 3C, the ARP communication unit 32 on the own terminal 3A side stores the MAC address (MAC-C) installed in the ARP response in the reception response MAC address storage unit 34 as the reception response MAC address. To do.

  However, the IP address duplication setting determination unit 35 on the own terminal 3A side receives the own terminal MAC address (MAC-A) stored in the own terminal MAC address storage unit 31 and the reception response stored in the reception response MAC address storage unit 34. Compared with the MAC address (MAC-C) and these MAC addresses are different, the IP address duplication notification equipped with the same reception response MAC address (MAC-C) is notified to the counterpart terminal 3B through the IP address duplication notification unit 36. (Step S77).

  Upon receiving the IP address duplication notification from its own terminal 3A, the IP address duplication receiving unit 37 on the partner terminal 3B side stores the MAC address installed in the IP address duplication notification in the duplication MAC address storage unit 38 as a duplication MAC address, Even if a packet with the duplicate MAC address being stored as the transmission source is received, the packet selection content of the packet selection unit 12 on the partner terminal 3B side is set and updated so that the packet is discarded.

  As a result, in the packet sorting unit 12 on the partner terminal 3B side, based on the updated packet sorting content, the MAC address (MAC-C) of the other terminal 3C, that is, a packet originating from the duplicate MAC address, for example, BYE Even if the packet is received, the packet is discarded (step S78), the voice packet is transmitted to the own terminal 3A (step S79), and the packet having the MAC address (MAC-A) of the own terminal 3A as a source, for example, A voice packet and a packet such as BYE are received (steps S80 and 81).

  Therefore, according to the third embodiment, the local MAC address is stored as the local MAC address, the ARP packet addressed to the local IP address is broadcast to the IP network 2, and the ARP When an ARP response corresponding to a packet is received within a predetermined time, and the reception response MAC address installed in the ARP response is different from the own terminal MAC address, an IP address duplication notification indicating the occurrence of an IP address duplication setting on the own terminal 3A side In the same ARP response, the mounted MAC address is mounted and notified to the partner terminal 3B, and when the partner terminal 3B receives the IP address duplication notification, the IP address duplication notification is duplicated as the duplicate MAC address. Stored in the MAC address storage unit 38, and the duplicate MAC address being stored is the source Since the packet selection contents of the packet selection unit 12 on the partner terminal 3B side are set and updated so that the packet is discarded even if the packet is received, the IP address duplication setting is set on the own terminal 3A side on the IP network 2 Even if this occurs, the local terminal 3A and the partner terminal 3B can continue communication without interrupting the session (call) without requiring an IP address setting change operation.

  In the third embodiment, it is determined in step S53 shown in FIG. 8 whether or not an ARP response to the ARP packet addressed to its own IP address is received within a predetermined time, and the ARP response is received. If it is determined, the MAC address installed in the ARP response is stored as a reception response MAC address, the reception response MAC address is compared with the own terminal MAC address, and the IP address is duplicated only when these MAC addresses are different. The notification is sent to the counterpart terminal 3B. For example, after the own terminal 3A transmits an ARP packet addressed to its own IP address, it does not return an ARP response to the ARP packet transmitted by the own terminal. In this case, when an ARP response to the local ARP packet is received within a predetermined time in step S53, the IP address It is determined that the duplicate set is generated, it goes without saying that similar effects be reported in IP address duplicate notification to the partner terminal 3B side is obtained.

(Embodiment 4)
Next, an IP network system 1D showing a fourth embodiment will be described. FIG. 11 is a block diagram showing a schematic configuration inside the IP network system 1D showing the fourth embodiment. The same components as those in the IP network system 1A shown in FIG. 1 are denoted by the same reference numerals, and the description of the overlapping components and operations is omitted.

  The IP network system 1D shown in FIG. 11 differs from the IP network system 1A shown in FIG. 1 in that the IP terminal 3 (own terminal 3A) stores its own terminal MAC address and communicates with the partner terminal 3B. The other party's MAC address received at the start of the session (call) is stored as the other party's MAC address, and the ARP packet addressed to the own IP address is broadcast to the IP network 2, and the ARP corresponding to the ARP packet is transmitted. When the response is received within a predetermined time, and the reception response MAC address mounted in the ARP response is different from the own terminal MAC address, an IP address duplication notification is notified to the partner terminal 3B, and the partner terminal 3B side receives a response from the partner. When an IP address duplication notification is received, a MAC address other than the partner MAC address is issued. As also discard the packet as a packet was received in the original, in the address setting processing section 18D for setting update packet sorting contents of the counterpart terminal 3B side of the packet sorting unit 12.

  The address setting processing unit 18D inside the IP terminal 3 shown in FIG. 11 stores the own terminal MAC address for establishing a session (call) with the counterpart terminal 3B on the IP network 2 as the own terminal MAC address. When a session (call) between the MAC address storage unit 41 and the partner terminal 3B is started, the MAC address of the host terminal is transmitted to the partner terminal 3B, and the MAC address of the partner terminal 3B is received from the partner terminal 3B. The MAC address communication unit 42 that receives the MAC address on the partner terminal 3B side through the MAC address communication unit 42, the partner MAC address storage unit 43 that stores the MAC address of the partner terminal 3B as the partner MAC address, Repeatedly send ARP packet addressed to its own IP address to network 2 ARP communication unit 44 that receives the ARP packet or ARP response addressed to its own IP address and receives the ARP packet through this ARP communication unit 44, and carries the MAC address of its own side in this ARP packet When the ARP response is received through the ARP response unit 45 that returns an ARP response to the ARP packet and the ARP communication unit 44, the received response MAC address that stores the MAC address mounted in the received ARP response as the received response MAC address. The storage unit 46 compares the reception response MAC address stored in the reception response MAC address storage unit 46 with the own terminal MAC address stored in the own terminal MAC address storage unit 41, and if these MAC addresses are different, the IP address Same IP address as own terminal 3A on network 2 IP address duplication setting determination unit 47 that determines that the IP address is duplicated in the other IP terminal 3, and this IP address duplication setting determination unit 47 determines that the same IP address is duplicated. Then, the IP address duplication notification unit 48 for notifying the counterpart terminal 3B of the IP address duplication notification and the IP address duplication reception unit 49 for receiving the IP address duplication notification through the IP address duplication notification unit 48 on the counterpart terminal 3B side are provided. is doing.

  Further, when receiving the IP address duplication notification from the counterpart through the IP address duplication receiving unit 49, the packet sorting unit 12 uses a MAC address other than the counterpart MAC address stored in the counterpart MAC address storage unit 43 as the source. Even if a received packet is received, the packet selection content is updated so that the packet is discarded.

  The IP terminal device according to claim 4 is the IP terminal 3 (own terminal 3A, partner terminal 3B and other terminal 3C), the IP network is the IP network 2, the partner terminal is the partner terminal 3B, and the host terminal MAC address storage means is The own terminal MAC address storage unit 41, the MAC address communication unit is the MAC address communication unit 42, the counterpart MAC address storage unit is the counterpart MAC address storage unit 43, the ARP communication unit is the ARP communication unit 44, and the ARP response unit is the ARP response unit. 45, the reception response MAC address storage means is the reception response MAC address storage section 46, the IP address duplication determination means is the IP address duplication setting judgment section 47, the IP address duplication notification means is the IP address duplication notification section 48, and the IP address duplication reception means is IP address duplication receiving section 49, packet sorting means is equivalent to packet sorting section 12 Is shall.

  Next, the operation of the IP network system 1D showing the fourth embodiment will be described. FIG. 12 is a flowchart showing the processing operation related to the second address duplication notification process inside the terminal 3A.

  The second address duplication notification process shown in FIG. 12 is for notifying the other terminal 3B of the IP address duplication notification when the IP address duplication setting occurs on the own terminal 3A side during the session (call) with the other terminal 3B. It is processing of.

  In FIG. 12, the own terminal 3A determines whether or not a session (call) with the counterpart terminal 3B is started via the IP network 2 (step S91).

  When it is determined that the MAC address communication unit 42 on the own terminal 3A side has started a session with the counterpart terminal 3B, the MAC address communication unit 42 transmits the MAC address on the own side to the counterpart terminal 3B via the IP network 2 and The MAC address on the partner terminal 3B side is received from the terminal 3B (step S92).

  When the MAC address communication unit 42 on the own terminal 3A side receives the MAC address on the partner terminal 3B side, the MAC address communication unit 42 stores this MAC address in the partner MAC address storage unit 43 as the partner MAC address (step S93).

  After storing the counterpart MAC address in the counterpart MAC address storage unit 43, the ARP communication unit 44 on the own terminal 3A side broadcasts an ARP packet addressed to the IP address of the own side to the IP network 2 (step S94). ), It is determined whether an ARP response to the ARP packet has been received within a predetermined time (step S95).

  If it is determined that the ARP communication unit 44 on the own terminal 3A side has received an ARP response to the ARP packet within a predetermined time, the MAC address installed in the ARP response is used as the reception response MAC address in the reception response MAC address storage unit 46. Store (step S96).

  When the IP address duplication setting determination unit 47 on the own terminal 3A side stores the reception response MAC address in the reception response MAC address storage unit 46, the reception response MAC address stored in the reception response MAC address storage unit 46 and the own terminal MAC address The own terminal MAC address stored in the storage unit 41 is compared (step S97), and it is determined whether or not these MAC addresses are different (step S98).

  If it is determined that the MAC address is different, the IP address duplication setting determination unit 47 on the own terminal 3A side sets the same IP address as that of the own terminal 3A on the IP network 2, that is, the IP address duplication setting is performed. It is determined that it has occurred (step S99), and an IP address duplication notification is sent to the counterpart terminal 3B through the IP address duplication notification section 48 (step S100), and it is judged whether or not the call with the counterpart terminal 3B has ended (step S100). Step S101).

  The own terminal 3A ends this processing operation if the call with the counterpart terminal 3B is ended. In addition, if the terminal 3A has not started a call with the partner terminal 3B in step S91, the processing ends.

  In addition, if the ARP communication unit 44 on the own terminal 3A side does not receive the ARP response within the predetermined time in step S95, the ARP communication unit 44 proceeds to step S101 to monitor whether or not the call with the partner terminal 3B is terminated. Transition.

  The IP address duplication setting determination unit 47 on the own terminal 3A side determines that the communication is normally performed when it is determined in step S98 that the reception response MAC address is not different from the own terminal MAC address. Then, the process proceeds to step S101 in order to monitor whether or not the call with the counterpart terminal 3B is terminated.

  Further, the ARP communication unit 44 on the own terminal 3A side should broadcast the ARP packet addressed to its own IP address to the IP network 2 unless the call with the counterpart terminal 3B is terminated in step S101. The process proceeds to step S94.

  According to the second address duplication notification process shown in FIG. 12, at the start of a session (call) with the counterpart terminal 3B, a predetermined time has elapsed after the ARP packet addressed to the IP address on the local side is broadcasted to the IP network 2. When the ARP response to the ARP packet is received and the MAC address installed in the ARP response is stored as the reception response MAC address, and the local terminal MAC address being stored and the reception response MAC address are different, the IP network 2 Since the IP address duplication notification indicating that the same IP address as that of the own terminal 3A is set to be duplicated is sent to the counterpart terminal 3B side, the IP address duplication notification from the own terminal 3A is sent to the counterpart terminal 3B side. Based on the above, it can be recognized that the IP address duplication setting has occurred on the terminal 3A side.

  Next, the processing operation on the partner terminal 3B side that has received the IP address duplication notification from its own terminal 3A in the second address duplication notification processing shown in FIG. 12 will be described. FIG. 13 is a flowchart showing a processing operation related to the fourth address setting process on the counterpart terminal 3B side.

  In the fourth address setting process shown in FIG. 13, when the IP address duplication notification is received from the own terminal 3A, the packet having the source MAC address other than the counterpart MAC address stored in the counterpart MAC address storage unit 43 is transmitted. This is a process for setting and updating the packet selection content of the packet selection unit 12 on the partner terminal 3B side so that the packet is discarded even if it is received.

  In FIG. 13, the counterpart terminal 3B determines whether or not a session (call) with the counterpart terminal 3A has started (step S111).

  The MAC address communication unit 42 on the partner terminal 3B side transmits its own MAC address to the partner, and receives the partner's MAC address from the partner (step S112). When the previous MAC address is received, the received MAC address is stored in the counterpart MAC address storage unit 43 as the counterpart MAC address (step S113).

  The IP address duplication receiving unit 49 on the partner terminal 3B side receives the IP address duplication notification from its own terminal 3A via the IP network 2 when the partner MAC address is stored in the partner MAC address storage unit 43. Whether or not (step 114).

  When it is determined that the packet sorting unit 12 on the partner terminal 3B side has received the IP address duplication notification from the partner terminal 3A, a packet other than the partner MAC address stored in the partner MAC address storage unit 43 is received. Even if a packet having a MAC address as a transmission source is received, the packet selection content is set and updated so that the packet is discarded (step S115).

  The partner terminal 3B determines whether or not the call with the partner terminal 3A is terminated (step S116). The partner terminal 3B ends this processing operation if the call with the partner terminal 3A is terminated. Further, the partner terminal 3B ends this processing operation unless the telephone call is started in step S111.

  If the IP address duplication receiving unit 49 on the partner terminal 3B side does not receive the IP address duplication notification from the partner terminal 3A in step S114, the call with the partner terminal 3A ends. In order to monitor whether or not the process has been performed, the process proceeds to step S116.

  In addition, unless the partner terminal 3B ends the call with the partner terminal 3A in step S116, the partner terminal 3B should monitor whether or not the IP address duplication notification is received from the partner terminal 3A. The process proceeds to step S114.

  According to the fourth address setting process shown in FIG. 13, when the session (call) is started, the MAC address of the own side is mutually transmitted / received to / from the other party, and the other party MAC address is stored as the other party MAC address. When the IP address duplication notification is received through the other party's IP address duplication notification unit 48, a packet having a source MAC address other than the other party MAC address stored in the other party MAC address storage unit 43 is received. Even if the packet is received, the packet selection content of the packet selector 12 on the own side is updated so that the packet is discarded. Therefore, the IP address duplication setting has occurred on the own terminal 3A side on the partner terminal 3B side. However, it is possible to continue the call with the own terminal 3A without being affected by the duplicate IP address setting.

  FIG. 14 is a sequence diagram briefly showing the operations of the own terminal 3A, the partner terminal 3B, and the other terminal 3C related to the second address duplication notification process and the fourth address setting process. For convenience of explanation, the MAC address of the own terminal 3A is MAC-A, the MAC address of the partner terminal 3B is MAC-B, the MAC address of the other terminal 3C is MAC-C, and the own terminal 3A and the other terminal 3C Assume that the IP addresses are the same (Addr-A).

  After transmitting INVITE corresponding to the call command via the IP network 2 (step S121) and receiving an OK response to INVITE from the counterpart terminal 3B (step S122), the own terminal 3A starts a session (call). become.

  Next, the own terminal 3A notifies the other party terminal 3B of its own MAC address (MAC-A) via the IP network 2 (step S123), and the other party terminal 3B sends its own MAC address via the IP network 2. (MAC-B) is notified to its own terminal 3A (step S124). The counterpart MAC address storage unit 43 on the counterpart terminal 3B side stores the MAC address (MAC-A) on the self terminal 3A side as the counterpart MAC address, and the counterpart MAC address storage unit 43 on the self terminal 3A side The counterpart terminal 3B side MAC address (MAC-B) is stored as the counterpart side MAC address.

  When the own terminal 3A and the partner terminal 3B store the partner MAC address, they transmit and receive voice packets via the IP network 2 (steps S125 and 126), thereby establishing a voice call between the partner terminal 3B and the host terminal 3A. It will be.

  When the ARP communication unit 44 on the own terminal 3A side broadcasts the ARP packet addressed to the own IP address to the IP network 2 (step S127), the other terminal 3C and the own terminal 3A are the same. Since it is an IP address (Addr-A), an ARP response to the ARP packet is received from the other terminal 3C (step S128).

  When receiving the ARP response from the other terminal 3C, the ARP communication unit 44 on the own terminal 3A side stores the MAC address (MAC-C) installed in the ARP response in the reception response MAC address storage unit 46 as the reception response MAC address. To do.

  However, the IP address duplication setting determination unit 47 on the own terminal 3 A side receives the own terminal MAC address (MAC-A) stored in the own terminal MAC address storage unit 41 and the reception response stored in the reception response MAC address storage unit 46. The MAC address (MAC-C) is compared, and since these MAC addresses are different, an IP address duplication notification is notified to the counterpart terminal 3B through the IP address duplication notification unit 48 (step S129).

  Upon receiving the IP address duplication notification from its own terminal 3A, the IP address duplication receiving unit 49 on the counterpart terminal 3B side sends a packet that uses a MAC address other than the counterpart MAC address stored in the counterpart MAC address storage unit 43 as the source. Even if the packet is received, the packet selection content of the packet selection unit 12 on the counterpart terminal 3B side is set and updated so that the packet is discarded.

  As a result, the packet sorting unit 12 on the partner terminal 3B side uses the MAC address (MAC-C) of the other terminal 3C, that is, a MAC address other than the partner MAC address as the source based on the updated packet sort contents. Even if a packet, for example, BYE is received, the packet is discarded (step S130), and a voice packet is transmitted to the terminal 3A (step S131), and the MAC address (MAC-A) of the terminal 3A is transmitted The received packets, for example, voice packets and BYE packets are received (steps S132 and 133).

  Therefore, according to the fourth embodiment, the local terminal MAC address of the local side is stored, and the MAC address of the counterpart terminal 3B received at the start of the session (call) with the counterpart terminal 3B is used as the counterpart MAC address. ARP packet addressed to its own IP address is broadcasted to the IP network 2, an ARP response corresponding to the ARP packet is received within a predetermined time, and a reception response MAC address mounted in the ARP response When the IP address duplication notification is sent to the other terminal side 3B and the other party terminal 3B receives the IP address duplication notice, the MAC address other than the other party MAC address is set as the source. Even if a packet is received, the packet selection content on its own terminal 3A side is set so that the packet is discarded. Since the IP address is duplicated on the own terminal 3A side on the IP network 2, the own terminal 3A and the other terminal 3B side do not need to change the IP address setting operation. Communication can be continued without interruption.

  In the fourth embodiment, it is determined in step S95 shown in FIG. 12 whether or not an ARP response to the ARP packet addressed to its own IP address is received within a predetermined time, and the ARP response is received. If it is determined, the MAC address installed in the ARP response is stored as a reception response MAC address, the reception response MAC address is compared with the own terminal MAC address, and the IP address is duplicated only when these MAC addresses are different. The notification is sent to the counterpart terminal 3B. For example, after the own terminal 3A transmits an ARP packet addressed to its own IP address, it does not return an ARP response to the ARP packet transmitted by the own terminal. In this case, when an ARP response to the local ARP packet is received within a predetermined time in step S95, the IP address is Determines that scan duplicate set is generated, it goes without saying that similar effects be reported in IP address duplicate notification to the partner terminal 3B side is obtained.

  According to the IP terminal device of the present invention, the MAC address of the counterpart terminal received at the start of the session stored in the first counterpart MAC address storage means, and the ARP response received in the second counterpart MAC address storage means When the MAC addresses obtained are compared, and the MAC addresses are different, it is determined that the same IP address as that of the counterpart terminal is set on the IP network, and the first counterpart MAC address storage means Even if a packet whose source is a MAC address other than the MAC address stored in is received, the packet is discarded, that is, only a packet whose source is the MAC address received at the start of the session is received. Therefore, even if duplicate IP address settings occur, change the IP address settings. Without, since it is possible to continue communication without interrupting the session, for example, is useful for IP network system that accommodates a plurality of IP network devices with a call voice capabilities.

The block diagram which shows schematic structure inside the IP network system which shows 1st Embodiment in connection with the IP terminal device of this invention The flowchart which shows the processing operation in connection with the 1st address setting process inside the own terminal in connection with 1st Embodiment. Sequence diagram briefly showing operation of own terminal, partner terminal and other terminals involved in first address setting process The block diagram which shows schematic structure inside the IP network system which shows 2nd Embodiment. The flowchart which shows the processing operation in connection with the 2nd address setting process in the own terminal in connection with 2nd Embodiment. Sequence diagram briefly showing operation of own terminal, partner terminal and other terminals involved in second address setting process The block diagram which shows schematic structure inside the IP network system which shows 3rd Embodiment. The flowchart which shows the processing operation in connection with the 1st address duplication notification processing inside the own terminal in connection with 3rd Embodiment. The flowchart which shows the processing operation in connection with the 3rd address setting process in the other party terminal concerning 3rd Embodiment. Sequence diagram briefly showing the operation of the own terminal, partner terminal and other terminals involved in the first address duplication notification process and the third address setting process The block diagram which shows schematic structure inside the IP network system which shows 4th Embodiment The flowchart which shows the processing operation in connection with the 2nd address duplication notification process inside the own terminal in connection with 4th Embodiment. The flowchart which shows the processing operation in connection with the 4th address setting process inside the other party terminal concerning 4th Embodiment. Sequence diagram briefly showing the operation of the own terminal, partner terminal and other terminals involved in the second address duplication notification process and the fourth address setting process

Explanation of symbols

2 IP network 3 IP terminal (IP terminal device)
12 Packet sorting unit (packet sorting means)
21, 42 MAC address communication unit (MAC address communication means)
22 First counterpart MAC address storage (first counterpart MAC address storage means)
23, 32, 44 ARP communication unit (ARP communication means)
24, 33, 45 ARP response unit (ARP response means)
25 Second partner MAC address storage (second partner MAC address storage means)
26, 35, 47 IP address duplication setting judgment unit (IP address duplication setting judgment means)
31, 41 Own terminal MAC address storage unit (own terminal MAC address storage means)
34, 46 Reception response MAC address storage (reception response MAC address storage means)
36, 48 IP address duplication notification section (IP address duplication notification means)
37, 49 IP address duplicate receiver (IP address duplicate receiver)
38 Duplicate MAC address storage (IP address duplicate receiving means)
43 Counterpart MAC address storage (partner MAC address storage means)

Claims (4)

A MAC address communication means for transmitting a MAC address of its own side to the counterpart terminal at the start of a session with the counterpart terminal on the IP network, and receiving a MAC address of the counterpart terminal from the counterpart terminal;
When receiving the MAC address of the counterpart terminal side through the MAC address communication means, a first counterpart MAC address storage means for storing the MAC address of the counterpart terminal side;
ARP communication means for repeatedly transmitting an ARP packet addressed to the IP address of the counterpart terminal and receiving an ARP packet addressed to its own IP address or an ARP response;
When receiving an ARP packet from the counterpart terminal through the ARP communication means, an ARP response means for mounting the MAC address of the own side in the ARP packet and returning an ARP response to the ARP packet;
When receiving an ARP response through the ARP communication means, second counterpart MAC address storage means for storing the MAC address installed in the received ARP response;
The MAC address stored in the first counterpart MAC address storage means is compared with the MAC address stored in the second counterpart MAC address storage means, and if these MAC addresses are different, the counterpart on the IP network IP address duplication determination means for judging that the same IP address as that of the terminal is set to be duplicated;
If it is determined by the IP address duplication determination means that the same IP address as that of the counterpart terminal is duplicated, a MAC address other than the MAC address stored in the first counterpart MAC address storage means is transmitted. An IP terminal apparatus comprising: a packet selection unit that discards a packet even if the original packet is received. A MAC address communication means for transmitting a MAC address of its own side to the counterpart terminal at the start of a session with the counterpart terminal on the IP network, and receiving a MAC address of the counterpart terminal from the counterpart terminal;
When receiving the MAC address of the counterpart terminal side through the MAC address communication means, a first counterpart MAC address storage means for storing the MAC address of the counterpart terminal side;
ARP communication means for repeatedly transmitting an ARP packet addressed to the IP address of the counterpart terminal and receiving an ARP packet addressed to its own IP address or an ARP response;
When receiving an ARP packet from the counterpart terminal through the ARP communication means, an ARP response means for mounting the MAC address of the own side in the ARP packet and returning an ARP response to the ARP packet;
When receiving an ARP response through the ARP communication means, second counterpart MAC address storage means for storing the MAC address installed in the received ARP response;
The MAC address stored in the first counterpart MAC address storage means is compared with the MAC address stored in the second counterpart MAC address storage means, and if these MAC addresses are different, the counterpart on the IP network IP address duplication determination means for judging that the same IP address as that of the terminal is set to be duplicated;
When it is determined by the IP address duplication determination means that the same IP address as that of the counterpart terminal is duplicated, a packet whose source is the MAC address stored in the second counterpart MAC address storage means An IP terminal apparatus comprising: a packet selection unit that discards the packet even if the packet is received. A self-terminal MAC address storage means for storing a MAC address of the self-side for establishing a session with the counterpart terminal on the IP network;
ARP communication means for repeatedly transmitting an ARP packet addressed to its own IP address and receiving an ARP packet addressed to its own IP address or an ARP response;
When receiving an ARP packet through the ARP communication means, an ARP response means for mounting the MAC address of the own side in the ARP packet and returning an ARP response to the ARP packet;
When receiving an ARP response through the ARP communication means, a reception response MAC address storage means for storing a MAC address mounted in the received ARP response;
The MAC address stored in the reception response MAC address storage means is compared with the MAC address stored in the own terminal MAC address storage means. If these MAC addresses are different, the same IP address as the own terminal on the IP network IP address duplication determination means for determining that the address is set to be duplicated;
If it is determined by the IP address duplication determination means that the same IP address as that of the own terminal is duplicated, an IP address duplication notification loaded with the MAC address stored in the reception response MAC address storage means is sent to the other party. IP address duplication notification means for notifying the terminal;
IP address duplication receiving means for receiving an IP address duplication notification through the IP address duplication notification means on the counterpart terminal side;
When receiving the IP address duplication notification on the counterpart terminal side through this IP address duplication receiving means, even if a packet with the MAC address installed in the IP address duplication notification is received as a source, packet selection means for discarding the packet An IP terminal device comprising: A self-terminal MAC address storage means for storing a MAC address of the self-side for establishing a session with the counterpart terminal on the IP network;
MAC address communication means for transmitting the MAC address of the own side to the counterpart terminal at the start of a session with the counterpart terminal, and receiving the MAC address of the counterpart terminal from the counterpart terminal;
When receiving the MAC address of the counterpart terminal through the MAC address communication means, the counterpart MAC address storage means for storing the MAC address of the counterpart terminal;
ARP communication means for repeatedly transmitting an ARP packet addressed to its own IP address and receiving an ARP packet addressed to its own IP address or an ARP response;
When receiving an ARP packet through the ARP communication means, an ARP response means for mounting the MAC address of the own side in the ARP packet and returning an ARP response to the ARP packet;
When receiving an ARP response through the ARP communication means, a reception response MAC address storage means for storing a MAC address mounted in the received ARP response;
The MAC address stored in the reception response MAC address storage means is compared with the MAC address stored in the own terminal MAC address storage means. If these MAC addresses are different, the same IP address as the own terminal on the IP network IP address duplication determination means for determining that the address is set to be duplicated;
If it is determined by the IP address duplication determination means that the same IP address as that of the own terminal is duplicated, an IP address duplication notification means for notifying the counterpart terminal of an IP address duplication notification;
IP address duplication receiving means for receiving an IP address duplication notification through the IP address duplication notification means on the counterpart terminal side;
When receiving the IP address duplication notification on the counterpart terminal side through the IP address duplication receiving means, even if a packet having a MAC address other than the MAC address stored in the counterpart MAC address storage means is received, An IP terminal apparatus comprising: a packet selection unit that discards a packet.

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