JP3997826B2 - IP address generation method and radio base station apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an IP address generation method and a radio base station apparatus in a network using the Internet protocol (IP) as a communication procedure.
[0002]
[Prior art]
As an Internet protocol, Internet Protocol Version 6 (IPv6) can be cited as an address protocol whose address space has been expanded and packet route control efficiency has been improved.
[0003]
In IPv6, a network device newly connected to the network generates a link local IP address that is valid only in the link local network from an ID unique to the device, and communicates with a router in the network using the link local IP address. By performing the above, an ID (subnet prefix) unique to the link local network can be obtained. Furthermore, a global IP address effective for the entire large-scale network can be generated from the subnet prefix and the device-specific ID.
[0004]
[Problems to be solved by the invention]
In IPv6 as described above, it is indispensable to ensure the uniqueness of link local and global IP addresses automatically generated by a network device. For this reason, in the network device newly connected to the network, automatically generated link local and global IP address duplication check packets are sent to the network, and when there is a duplicate IP address, a reply packet to the investigation packet is received. To detect duplicates.
[0005]
In addition, if a reply packet is not received within a certain time after sending a duplicate check packet, the IP address is not duplicated and the uniqueness of the automatically generated IP address is ensured.
[0006]
However, in the above method, there is a problem that a network device newly connected to the network cannot perform communication for a certain period of time for connection after the connection.
[0007]
An object of the present invention is to reduce the communication interruption time due to the IP address duplication check time when a network device is connected to a new network.
[0008]
[Means for Solving the Problems]
In order to solve this problem, the present invention, when receiving an IP address duplication check packet from a network device newly connected to the network in a network device that manages and controls an IP network such as a router, A duplicate inspection result is sent to the duplicate inspection packet transmission source, and in a network device newly connected to the network, an IP address duplication inspection result packet is received from a network device such as a router. The duplication check result of the generated IP address can be determined without waiting.
[0009]
Furthermore, in a network device using radio, it is necessary to establish a radio path in the media access control unit before establishing a communication path using the Internet protocol (IP). Therefore, during this wireless path establishment process, the duplication check process in the network device can be omitted by notifying the duplication check result of the IP address of the network device newly connected to the network.
[0010]
Thereby, in the network device using IPv6, it is possible to reduce the occurrence of communication interruption time due to the IP address duplication check when the device is newly connected to the network.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
  The invention according to claim 1 of the present invention is a method for generating an IP address of a network device that uses the Internet Protocol (IP) as a communication procedure.When the network device is connected to the network,A message that automatically generates an IP address and requests duplicate inspection of the automatically generated IP addressIP address management deviceSend out,The connected network device isIn response to the message, a duplicate check result message indicating that there is no duplication of the IP address is received. The IP address is automatically generated, and the generated IP address is checked for duplication. Thus, the uniqueness of the generated IP address can be ensured.
[0012]
  According to a second aspect of the present invention, in the IP address generation method according to the first aspect, the IP address management device includes a control station that manages a network address, an IP address duplication check network device that performs an IP address duplication check, Either a home agent that manages the relationship between the global IP address of the mobile terminal and the home address, or a wireless base station that provides access to the IP network of the wireless mobile terminal 1 Thus, it is possible to shorten the time for ensuring the uniqueness of the generated IP address.
  Claim3The invention described in claim 1 is the IP address generation method according to claim 1, whereinFrom the IP address management deviceThe duplicate check result message is characterized in that the duplicate IP address of another network device registered in the address database is checked to indicate that the requested IP address is not duplicated. The time for ensuring the uniqueness of the address can be shortened.
[0013]
  Claim4In the method for generating an IP address of a network device that uses the Internet Protocol (IP) as a communication procedure,SaidWhen the network device is connected to the network, it automatically generates an IP address, sends a message requesting duplicate inspection of the automatically generated IP address, receives the IP address from the network device as a response to the message, Check whether the received IP address is the same as the IP address of another network device registered in the address database, output the result as a duplicate check result message, and output the duplicate check result message A duplicate check result message indicating that there is no duplication of the IP address is received from an IP address duplication check network device having a function of transmitting to the network device, and the unique IP address generated thereby is unique. The time to secure safety Door can be.
[0014]
  Claim5In the IP address generation device for a network device that uses the Internet Protocol (IP) as a communication procedure,SaidAn address generation unit that automatically generates an effective IP address in the network when the network device is connected to the network;SaidA message requesting duplicate inspection of automatically generated IP address as a packetIP address management deviceAn IP address generated by the packet generation unit to be transmitted and a communication processing unit that receives a duplicate check result message indicating that there is no IP address duplication as a response to the message; It is possible to shorten the time for ensuring uniqueness.
[0015]
  Claim6The invention described in claim 15In the IP address generation device described in 1), the IP address is a link local IP address effective in a local link or a global IP address effective in the entire large-scale network.
[0016]
  Claim7The communication processing for receiving an IP address duplication check request message from a network device connected to the network in a network IP address duplication check network device that uses the Internet Protocol (IP) as a communication procedure. And an address database in which IP addresses of all network devices connected to the network are registered, and the IP address received by the communication processing unit overlaps with IP addresses of other network devices registered in the address database. And an address checking unit that outputs a duplicate check result indicating that there is no duplication of the IP address as a duplicate check result message, and the communication processing unit outputs from the address check unit The duplicate inspection result And characterized in transmitting the message to the network device, it is possible to shorten the time for the uniqueness ensuring the generated IP address thereby.
[0017]
  Claim8When the mobile terminal acquires a valid global IP address (care-of address) in the foreign network of the destination, the acquired care-of address and the global IP address (home address) of the mobile terminal in the home network The home agent that requests the home agent to register the relationship of the network, and the home agent that has received the registration request records the home address of the network device including the mobile terminal whose home address is connected to the home network. By referring to the mobile terminal, a duplicate check result indicating that there is no duplication of the home address requested for registration is transmitted to the mobile terminal, and the time for ensuring the uniqueness of the home address is shortened. can do.
[0023]
  Claim9In the mobile terminal connected to the network using the Internet protocol (IP) as a communication procedure by connecting to the radio base station by radio, the IP address duplication in the frame is made to the radio base station. Means for sending a connection registration request message including a unique ID for performing inspection, and means for receiving from the wireless base station a duplicate inspection result message indicating that there is no duplication of IP addresses generated from the unique ID. This makes it possible to shorten the time for ensuring the uniqueness of the IP address of the mobile terminal.
[0024]
  Claim10In the wireless base station that provides a connection to a network that uses the Internet Protocol (IP) as a communication procedure for a registered wireless network device, an IP address in a frame is received from the new wireless network device. Means for receiving a connection registration request message including a unique ID for performing duplication check of the IP address, means for performing duplication check of an IP address generated from the unique ID of the new wireless network device, and the new wireless network device. Means for notifying the duplication check result message indicating that there is no duplication of the IP address, and the means for carrying out the duplication check is an IP address of all network devices in the connected network regardless of wired or wireless. By referring to the address database recorded. And characterized in that to perform the duplication checker IP address of the network device, which makes it possible to shorten the time for the uniqueness ensuring IP address of the wireless network device.
[0028]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0029]
(Embodiment 1)
FIG. 1 is an example of a communication network system of a link local network and a plurality of network devices connected thereto in Embodiment 1 of the present invention.
[0030]
In FIG. 1, a control station 110 that performs network address management and the like, a plurality of fixed terminals 130 and 140, and a plurality of mobile terminals 150 and 160 are connected in a link local network 100 of the same segment. It shows that. When the network device 120 is newly connected to the link local network 100 or when the network device 130-160 is initialized by activation or reset, the new network device 120 uses the link local network 100. It is necessary to set an IP address for communication via the IP address, the IP address is automatically generated, and the IP address duplication check is performed.
[0031]
FIG. 2 shows a functional block diagram of the network device according to the first embodiment of the present invention.
[0032]
In FIG. 2, 100 is a link local network that is the same segment to which the network device is connected, 110 is an IP address duplication check network device that performs an IP address duplication check, and 111 is an IP packet transmitted on the link local network 100. Address checking unit for checking the address, 112 is a network device existing on the link local network 100 and an address database for recording addresses in the home network of a mobile terminal having the link local network as a home network, 113 is a link local in the network device 110 A communication processing unit 114 that transmits a packet to the network 100 and processes a communication procedure for receiving the packet, and 114 is a parameter for determining the type of the received packet. 110 is a packet generator that generates a packet to be transmitted, 120 is an IP address automatic generation network device that automatically generates an IP address, 121 is an address generator that automatically generates an IP address, and 122 is an IP packet A packet generator 123 for determining the type of packet received from the network, and 124 for transmitting a packet to the link local network 100 and processing a communication procedure for receiving the packet. A communication processing unit 125 for setting a timer indicates a timer processing unit for notifying a timeout of the set timer.
[0033]
Operations of the IP address automatic generation network device 120 and the IP address duplication check network device 110 configured as described above will be described.
[0034]
First, the operation of the IP address automatic generation network device 120 shown in FIG. 2 will be described using the flowchart of FIG.
[0035]
The device 120 connected to the link local network 100 using the Internet protocol (IP) as a communication procedure starts processing from S31 in FIG. 3 to determine the IP address of the device after connecting to the new network. First, an appropriate IP address is generated in S32 in FIG. In the present invention, the IP address generation method in S32 in FIG. 3 is not particularly defined, but a method of generating using EUI-64 using a link layer ID, a method of generating based on random numbers, etc. Can be considered.
[0036]
After the generation of the IP address of the S32 process, the presence / absence of reception of a packet from the link local network 100 is confirmed in S33 in FIG. 3, and if a packet is received, the packet is received in S34 in FIG. If not, the process proceeds to S36 in FIG.
[0037]
In S34 in FIG. 3, it is determined whether or not the received packet is a packet indicating that there is a duplicate IP address, and if it is a packet indicating that there is a duplicate, the process returns to S32 in FIG. If the received packet is not a packet indicating that there is a duplicate IP address, the process proceeds to S35 in FIG.
[0038]
In S35 in FIG. 3, it is determined whether or not the received packet is a packet indicating that there is no duplication of the IP address. If the packet indicates that there is no duplication, the process proceeds to S39 in FIG. 3 to determine the IP address. The process ends. If the received packet is a packet indicating that the IP address is duplicated, the process proceeds to S36 in FIG.
[0039]
In S36 in FIG. 3, it is determined whether a packet for requesting duplicate inspection has been transmitted. If not transmitted, the process proceeds to S37 in FIG. 3, and if transmitted, the process proceeds to S38 in FIG. .
[0040]
In S37 in FIG. 3, a packet for requesting duplicate inspection is sent to the link local network 100, a timer is set, and the process proceeds to S33 in FIG.
[0041]
In S38 in FIG. 3, it is determined whether the timer set in S37 has expired and timed out. If timed out, the process proceeds to S39 in FIG. 3, the IP address is determined, and the process is terminated. If not timed out, the process proceeds to S33 in FIG.
[0042]
As described above, the IP address automatic generation network device 120 can automatically generate an IP address ensuring uniqueness.
[0043]
In FIG. 3, after it is determined in step S33 that a packet has been received, it is determined whether the received packet is a packet notifying that there is duplication, and then determining whether it is a packet notifying that there is no duplication. However, the same effect can be obtained even if this determination order is changed.
[0044]
In FIG. 3, after it is determined in step S33 that there is a packet received, it is determined whether the received packet is a packet notifying that there is duplication, and then determining whether it is a packet notifying that there is no duplication. However, it is determined whether the received packet is a packet notifying that there is duplication, a packet notifying that there is no duplication, or any of them. In each case, the processing transition destination is shown in FIG. The same effect can be obtained by performing S32, S39 and S36.
[0045]
In FIG. 3, after generating an IP address in S32 processing, it is determined whether or not a duplicate check request packet has been transmitted after determining whether or not a packet has been received. Similar effects can be obtained.
[0046]
Next, the operation of the IP address duplication check network device 110 shown in FIG. 2 will be described.
[0047]
After starting or connecting to the new link local network 100, the IP address duplication check network device 110 checks the address of the network device existing on the connected link local network 100 and stores it in the address database 112.
[0048]
FIG. 9 shows an example of the data format of the address database 112. In FIG. 9, 900 is an address database, 911 is an ID unique to the interface of the network device 120, 912 is a link local address valid only within the link local network 100 of the network device 120, and 913 is the entire wide area network of the network device 120. A valid global address 914 indicates a care-of address in the destination network when the network device 120 is a mobile terminal.
[0049]
In the example of FIG. 9, IPv6 is used as the IP address system, but a similar address database can be created with IPv4. In the example of FIG. 9, the care-of address and the like are stored as additional information in the address database 112, but it is not necessary to store an address that is not used for the duplication address investigation.
[0050]
In the present invention, a method for investigating the address of the network device 120 existing on the link local network 100 is not defined, but a method using Neighbor Solicitation is conceivable.
[0051]
It is also conceivable that the address check is always updated not only immediately after starting but also at regular intervals. It is also possible to add the source address of the packet received by the communication processing unit 113 to the address database 112 if it is not recorded in the address database 112 as a result of referring to the address database 112 in the address examining unit 111. It is done.
[0052]
The processing when the communication processing unit 113 of the IP address duplication check network device 110 receives a packet from the link local network 100 will be described with reference to the flowchart of FIG.
[0053]
The communication processing unit 113 receives the packet and starts processing from S41. In S42, it is determined whether the received packet is a packet for requesting a duplicate check. If it is a packet for requesting duplicate inspection, the process proceeds to S43, and if not, the process proceeds to S47.
[0054]
In S43 in FIG. 4, the IP address duplication check is performed by extracting the inspection target IP address from the duplication check request packet and referring to the address database 112. If the IP address to be inspected is a link local address, the column of the link local address 912 in FIG. 9 is examined. If the IP address to be inspected is a global address, the column of the global address 913 in FIG.
[0055]
As a result of the investigation, if there is an IP address duplication, the process proceeds to S44, and if there is no duplication, the process proceeds to S45.
[0056]
In S44 in FIG. 4, a packet notifying that there is duplication addressed to the network device 120 that transmitted the duplication check request packet is generated, and the process proceeds to S46.
[0057]
In S45 in FIG. 4, a packet notifying duplication addressed to the network device 120 that transmitted the duplication check request packet is generated, and the process proceeds to S46.
[0058]
In S46 in FIG. 4, the packet generated in S44 or S45 processing is transmitted to the link local network 100, the process proceeds to S51, and the processing ends.
[0059]
In S47 in FIG. 4, the source IP address is extracted from the received packet, and the process proceeds to S48.
[0060]
In S48 in FIG. 4, it is determined from the source IP address extracted in S47 whether the network device 120 that transmitted the packet is a device connected to the link local network 100. If there is, the process proceeds to S49. If the device is not connected to the link local network 100, the process proceeds to S51 and the process is terminated.
[0061]
In S49 processing in FIG. 4, it is investigated whether the IP address extracted in S49 processing has been registered in the address database 112 by searching the address database 112. If it has been registered, the processing proceeds to S51 and processing is performed. finish. If not registered, the process proceeds to S40.
[0062]
In the S40 process in FIG. 4, the IP address extracted in the S47 process is registered in the address database 112, the process proceeds to S51 and the process ends.
[0063]
As described above, the IP address duplication check network device 110 can promptly notify the IP address duplication check result in response to the IP address duplication check request packet.
[0064]
(Embodiment 2)
FIG. 5 shows an example of a communication network system of a home agent (HA) and a mobile terminal (MN) that supports the movement of the mobile terminal in Embodiment 2 of the present invention.
[0065]
In FIG. 5, 200 is a wide area network (WAN) connecting a plurality of local area networks (LAN), 201 is a home network to which an HA and a non-moving MN are connected, 202 is a MN away from the home network 201 A foreign network connected at the destination, 203 a home agent that supports the movement of the mobile terminal, and 204 a mobile terminal.
[0066]
In the above configuration, when the mobile terminal 204 is activated in a state where it is connected to the foreign network 202, or is activated in a state where it is not connected to any network and then connected to the foreign network 202, the mobile terminal 204 is A valid global IP address (care-of address) is acquired in the foreign network 202.
[0067]
Next, the home agent 203 is requested to register the relationship between the acquired care-of address and the global IP address (home address) in the home network of the mobile terminal 204. Upon receiving the registration request, the home agent 203 receives the address of the network device whose home address included in the registration request is connected to the home network 201 and the home address of the mobile terminal 204 other than the mobile terminal 204 managed by the home agent 203. If there is no duplication, a reply indicating acceptance of the registration request is sent to the mobile terminal 204. If there is a duplication, a reply indicating rejection of registration training is transmitted to the mobile terminal 204.
[0068]
In the present invention, home address duplication check in the home agent 203 is prepared in advance in the home agent 203, the address of the network device connected to the home network 201, and the mobile terminal 204 managed by the home agent 203. This is performed by referring to a list of home addresses, and the time required for the home address duplication check is shortened.
[0069]
According to the present embodiment described above, it is possible to reduce the processing time of the care-of address registration that ensures the uniqueness of the home address in the IP network that enables movement of the mobile terminal.
[0070]
(Embodiment 3)
FIG. 6 is an example of a radio communication network system of radio base stations and radio mobile terminals in Embodiment 3 of the present invention.
[0071]
In the figure, a wireless base station 301 is connected to an IP network 350 and provides access to the IP network 350 for the wireless mobile terminal 300. In the figure, the IP network 350 to which the radio base station 301 is connected is a wide area network, but it may be connected to a local area network (LAN).
[0072]
Hereinafter, a procedure for registering radio mobile terminal 300 in radio base station 301 in Embodiment 3 will be described with reference to FIG.
[0073]
In FIG. 7, 300 is a wireless mobile terminal, 301 is a wireless base station, 302 is an IP communication processing unit in the wireless mobile terminal 300, 303 is a media access control (MAC) processing unit in the wireless mobile terminal 300, and 304 is a wireless base station 301. MAC processing unit 305, IP communication processing unit 305 in the wireless base station, 310 to 314 messages for performing IP address registration processing between the processing units, and 315 an IP session after the registration processing is completed.
[0074]
When the wireless mobile terminal 300 confirms the presence of the wireless base station by a beacon frame not shown in the figure, a signal from the control channel, or the like, the wireless mobile terminal 300 performs an IP address registration process for performing communication through the wireless base station 301. Do.
[0075]
The wireless mobile terminal 300 first transmits a registration request message 310 from the MAC processing unit 303. An example of the registration request message 310 is shown in FIG. FIG. 8 shows an example of a management frame in the IEEE 802.11 standard. FrameControl 801 indicates a frame type, in this case, a registration request. Duration 802 indicates a frame transmission period, DestinationAddress 803 indicates a unique ID of a frame destination device, SourceAddress 804 indicates a unique ID of a frame transmission source device, and BSSID 805 indicates an identification ID of a wireless LAN group. SequenceControl 806 indicates the sequence number of the frame to be transmitted. FrameBody 807 indicates the data body included in the frame. CRC 808 indicates a cyclic code for error detection.
[0076]
In the wireless base station 301, the MAC processing unit 304 of the wireless base station 301 receives the registration request message 310, and extracts the SourceAddress 804 that is the unique ID of the transmission source device from the received registration request message 310. The extracted SourceAddress 804 is notified to the IP communication processing unit 305 as a duplication check request message 311.
[0077]
The IP communication processing unit 305 generates the IP address of the wireless mobile terminal 300 according to IPv6 Stateless Address Autoconfiguration (IETF RFC2462) from the SourceAddress 804 that is the unique ID of the wireless mobile terminal 300 notified by the duplication check request message 311 and generates the generated IP Check for duplicate addresses.
[0078]
The duplicate check result is sent to the MAC processing unit 304 as a duplicate check result message 312. The MAC processing unit 304 sends out a registration permission message 313 including the IP address duplication check result notified by the duplication check result message 312. As an example of the registration permission message 313, a frame in which FrameControl 801 is set to a frame type indicating registration permission in the management frame of the IEEE802.11 standard shown in FIG. 8 and the duplicate inspection result is stored in FrameBody 807 can be considered.
[0079]
When the registration permission message 313 is received and the registration permission message 313 includes a duplicate check result, the MAC processing unit 303 of the wireless mobile terminal 300 transmits a MAC registration process completion message 314 including the duplicate check result to the wireless mobile terminal. The IP communication processing unit 302 is notified. In the IP communication processing unit 302, when the MAC registration processing completion message 314 notifies the test result that there is no IP address duplication, the IP address is determined from the unique ID of the wireless mobile terminal 300 according to IPv6 Stateless Address Autoconfiguration (IETF RFC2462). Generate and start IP session 315 without performing duplicate checking.
[0080]
According to the present embodiment described above, the wireless mobile terminal 300 can promptly start communication in which the uniqueness of the IP address is ensured after the wireless link registration processing is completed.
[0081]
In this embodiment, the case where IEEE802.11 is used as a wireless link has been described. However, the same applies to any wireless system that uses a terminal unique ID when registering the wireless mobile terminal 300 in the wireless base station 301. The effect of can be obtained.
[0082]
In this embodiment, the method described in IETF RFC2462 has been described as a method for generating an IP address from a unique ID of a wireless mobile terminal, but the IP address generation method in the wireless mobile terminal and the wireless base station is the same. The same effect can be obtained even if an IP address generation method other than IETF RFC2462 is used.
[0083]
【The invention's effect】
As described above, the effect of the present invention is that when a terminal is connected to a network, an IP address is automatically generated, and the time required to ensure the uniqueness of the generated IP address can be shortened. This has the effect that can be started immediately.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a communication network system according to a first embodiment of the present invention.
FIG. 2 is a functional block diagram of a network device according to the first embodiment of the present invention.
FIG. 3 is a flowchart of the operation of the IP address automatic generation network device according to the first embodiment of the present invention.
FIG. 4 is a flowchart of the operation of the IP address duplication check network device according to the first embodiment of the present invention.
FIG. 5 is a configuration diagram of a communication network system according to a second embodiment of the present invention.
FIG. 6 is a configuration diagram of a wireless communication network system of a home agent and a mobile terminal that supports terminal movement in Embodiment 3 of the present invention.
FIG. 7 is a sequence diagram of a procedure for registering a radio mobile terminal with a radio base station.
FIG. 8 is a diagram showing an example of an IEEE 802.11 management frame
FIG. 9 is a diagram showing an example of the data format of the address database
[Explanation of symbols]
100 link local network
110 IP address duplication check network device
111 Address Search Department
112 address database
113 Communication processing unit
114 Packet type determination unit
115 packet generator
120 Network equipment
130 Fixed terminal 1
140 Fixed terminal 2
150 Mobile terminal 1
160 Mobile terminal 2
200 Wide Area Network (WAN)
201 home network
202 Foreign Network
203 Home Agent (HA)
204 Mobile terminal (MN)
300 Wireless mobile terminal
301 wireless base station
302 IP communication processing unit of wireless mobile terminal
303 MAC processing unit of wireless mobile terminal
304 MAC processing unit of wireless base station
305 IP communication processing unit of wireless base station
350 Wide area network

Claims (10)

In a method for generating an IP address of a network device that uses the Internet Protocol (IP) as a communication procedure,
When the network device is connected to the network, an IP address is automatically generated,
Sends a message requesting the duplication examination of IP addresses that the automatically generated IP address management device,
The IP address generation method, wherein the connected network device receives a duplicate check result message indicating that there is no duplication of the IP address as a response to the message. The IP address management device includes a control station that manages network addresses, an IP address duplication check network device that performs duplication checking of IP addresses, a home agent that manages a relationship between a global IP address of a mobile terminal and a home address, and a wireless mobile terminal Any of the wireless base stations that provide access to the IP network 1 Claims including 1 The IP address generation method described. The duplication check result message from the IP address management device is checked for duplication with IP addresses of other network devices registered in the address database, and indicates that the requested IP address is not duplicated. Item 2. The IP address generation method according to Item 1. In a method for generating an IP address of a network device that uses the Internet Protocol (IP) as a communication procedure,
When the network device is connected to the network, an IP address is automatically generated,
Send a message requesting duplicate inspection of automatically generated IP address,
In response to the message, an IP address is received from the network device, and it is checked whether the received IP address is the same as the IP address of another network device registered in the address database, and the result is duplicated. Receiving a duplicate inspection result message indicating that there is no duplication of the IP address from an IP address duplication inspection network device having a function of outputting as an inspection result message and transmitting the output duplicate inspection result message to the network device; An IP address generation method characterized by the above. In an IP address generation device of a network device that uses the Internet Protocol (IP) as a communication procedure,
When the network device is connected to a network, an address generation unit that automatically generates an IP address that is valid in the network; and
A packet generating unit to be transmitted to the IP address management apparatus a message as a packet for requesting a duplicate test of the IP address that the automatically generated,
An IP address generation apparatus comprising: a communication processing unit that receives a duplicate check result message indicating that there is no IP address duplication as a response to the message. 6. The IP address generation apparatus according to claim 5 , wherein the IP address is a link local IP address effective in a local link or a global IP address effective in the entire large-scale network. In an IP address duplication check network device for a network that uses the Internet Protocol (IP) as a communication procedure,
A communication processing unit that receives a message requesting a duplicate check of an IP address from a network device connected to the network;
An address database in which IP addresses of all network devices connected to the network are registered;
Investigating whether the IP address received by the communication processing unit is not duplicated with the IP address of another network device registered in the address database, a duplicate inspection result indicating that there is no duplication of the IP address An address checking unit that outputs as a duplicate check result message,
The IP address duplication check network device, wherein the communication processing unit transmits the duplication check result message output from the address check unit to the network device. When the mobile terminal acquires a valid global IP address (care-of address) in the destination foreign network, registration of the relationship between the acquired care-of address and the global IP address (home address) in the home network of the mobile terminal Ask the agent,
The home agent that has received the registration request refers to an address database in which the home address included in the registration request records the home address of the network device including the mobile terminal connected to the home network. An IP address duplication check method, wherein a duplication check result indicating no duplication is transmitted to the mobile terminal. In a mobile terminal connected to a network that uses the Internet Protocol (IP) as a communication procedure by connecting to a wireless base station by radio,
Means for sending a connection registration request message including a unique ID for performing a duplicate check of an IP address in a frame to the radio base station;
And a means for receiving a duplication check result message indicating that there is no duplication of IP addresses generated from the unique ID from the radio base station. In a wireless base station that provides a connection to a network that uses the Internet Protocol (IP) as a communication procedure for registered wireless network devices,
Means for receiving, from a new wireless network device, a connection registration request message including a unique ID for performing an IP address duplication check in a frame;
Means for performing an IP address duplication check generated from the unique ID of the new wireless network device;
Means for notifying the new wireless network device of a duplicate inspection result message indicating that there is no duplication of the IP address;
The means for performing duplication inspection performs duplication inspection of the IP address of the wireless network device by referring to an address database that records IP addresses of all network devices in a network connected regardless of wired or wireless. A radio base station apparatus characterized by the above.

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