WO2001063854A1 - Terminal, dispositif relais, procede de communication et programme de communication a cet effet - Google Patents

Terminal, dispositif relais, procede de communication et programme de communication a cet effet Download PDF

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Publication number
WO2001063854A1
WO2001063854A1 PCT/JP2001/001284 JP0101284W WO0163854A1 WO 2001063854 A1 WO2001063854 A1 WO 2001063854A1 JP 0101284 W JP0101284 W JP 0101284W WO 0163854 A1 WO0163854 A1 WO 0163854A1
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WO
WIPO (PCT)
Prior art keywords
network
address
service identifier
terminal device
entry
Prior art date
Application number
PCT/JP2001/001284
Other languages
English (en)
Japanese (ja)
Inventor
Kenji Takeda
Kazuhiro Okanoue
Masahiro Ono
Koichi Ebata
Shuichi Shibata
Masahiko Tsukue
Original Assignee
Nec Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Corporation filed Critical Nec Corporation
Priority to AU2001234115A priority Critical patent/AU2001234115A1/en
Publication of WO2001063854A1 publication Critical patent/WO2001063854A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/618—Details of network addresses
    • H04L2101/663—Transport layer addresses, e.g. aspects of transmission control protocol [TCP] or user datagram protocol [UDP] ports

Definitions

  • Terminal device Terminal device, relay device, communication method and communication program therefor
  • the present invention relates to a terminal device, a relay device, a communication method, and a communication program thereof, and more particularly, to data communication between a plurality of networks configured by different address systems.
  • IP address assigned to a terminal device that communicates on the Internet must be unique on the Internet. For this reason, with the spread of the Internet and the accompanying increase in the number of terminal devices, the shortage of addresses assigned to terminal devices has become a problem.
  • IP address assignment It is managed globally by (Internet As Signe d Numbers Au- tority), and users cannot basically assign and use it without permission.
  • these technologies convert addresses between one connected network and the other network between two connected networks having different address systems, and transfer an IP address as a global address.
  • the private address is defined in RFC 1918, "Address Allocate on for Private Internet,” and is used irrespective of the above-mentioned IANA management in the United States.
  • the second condition uses an addressing system based on the fact that each of the network Na and the network Nb assigns an identifier uniquely identifiable in the network to the connected terminal device as an address. That is.
  • the third condition is as follows for any terminal device connected to the network Na.
  • One partial condition 3-1 is that “the value A of the address of the terminal device T does not make sense as an identifier representing an address in the address system of the network Nb (eg, is not used as an identifier representing an address)”.
  • the other part of condition 3-2 is that “the value A of this address is meaningful as an identifier that represents an address in the address system of network Nb (used as an identifier that represents an address), but the value A of this address is used in network Nb. Is not assigned to the terminal device connected to the network Na. "
  • the Internet 1010 includes a meta network in which a first network 1011, a second network 1012, a third network 1013, and a fourth network 1014 are connected.
  • the address system of each network shown in the figure is as follows. That is, the Internet 1010 uses a global address excluding this number in operation so that “133.xx.x.x” can be used in the first network 1011.
  • the first network 1011 uses the global address “133.X.X.x”.
  • the second network 1012 uses the private address “10.X.X.x”.
  • the third network 1013 uses the private address “10.0-254.X.x”.
  • the fourth network 1014 uses the private address “10.255.X.x”.
  • the third network 1013 and the fourth network 1014 are configured such that “10.0.X.X x: L 0.254.X.X” of one private address “10.XXx” The remaining “10. 255. ⁇ . ⁇ ” is It is a subnet of 4 networks 104.
  • any two networks in FIG. 1 satisfy the partial condition 1 and the partial condition 2 among the above conditions.
  • Both the global address system and the private address system use a part of the value in the 32-bit space as the address value.However, the global address system does not use the address value used in the private address system. I'm sorry. Therefore, the network using the global address system and the network using the private address system satisfy the above partial condition 3_1, and the above condition is satisfied. Therefore, the address system is different. That is, the address system for the Internet 110 and the first network 101 is composed of the second network 1102, the third network 101, and the fourth network 101. 4 The address system for each is different.
  • the addressing system is not different.
  • the second network 1 0 1 2 has the address system since the condition 3-1 does not hold but the condition 3-2 holds with respect to the third network 1 0 1 3 and the fourth network 1 0 1 4.
  • the address systems do not differ between the third network 101 and the fourth network 104 because Condition 3 does not hold.
  • a conventional communication system to which the NAPT technology is applied includes a terminal device 111, a NAPT relay device 112, a server device 113, and a private network 111. It consists of 40, and a global network of 1,150.
  • the terminal device 110 is accessed from the terminal device 110 via the NAPT relay device 112.
  • the terminal device 1 1 1 0 and the NAPT relay device 1 1 2 0 are connected via a private network 1 1 4 0.
  • the NAPT relay device 1120 and the server device 1130 are connected via a global network 1150.
  • Different address systems are applied to the global network 1150 and the private network 1140, respectively. Terminal devices connected to the global network 1 150 are assigned a global address, and The terminal connected to the work 1140 is assigned a private address.
  • the server device 1130 also includes communication means using TCPZIP, and uses this communication means to wait for a connection from the client program of the terminal device 1110 and to provide information processing equipment equipped with a server program that communicates with the connected client program to the global.
  • One global address (referred to as Ag-s) of one val network 1150 is assigned.
  • the super program is waiting for a connection from the client program at the port identified by the port number "P-s".
  • the client program needs to know the port number "P-s" of this port, and when connecting to the server program, the communication means uses this port number "P_s" as the port number of the destination port. specify.
  • the client program can connect to the server program and start a communication session with the server program.
  • the N APT relay apparatus 1120 includes packet receiving means 1121 and 1123, packet transmitting means 1122 and 1124, address converting means 1125 and 1126, and storage means 1127.
  • the NAPT relay device 1120 is a router having an IP bucket relay function.
  • One private address “Ap-r” is assigned to the private network 1140 and one global address is assigned to the global network 1150. Ag—r ”each is assigned.
  • the illustrated correspondence management table 271 includes an entry identifier field, a first socket field, a second socket field, and a third socket field.
  • Has an entry consisting of The entry identifier field stores the value of the entry identifier that uniquely identifies each entry in the correspondence management table in the NAPT relay device 112.
  • the first socket field is composed of a pair of an address and a port number of the private network 1140
  • the second socket field and the third socket field are each a global network. It consists of a pair of an IP address of 1501 and a port number.
  • the bucket receiving means 1 1 2 1 receives an IP packet addressed to the global network 1 1 3 0 sent from the private network 1 1 1 0, and converts the received IP packet into address conversion means 1 1 1 2 pass to 5.
  • the packet transmitting means 1 122 sends the IP bucket passed from the address converting means 1 125 to the global network 115.
  • the address conversion means 1 125 comprises a correspondence search means 1 131, a bucket conversion means 1 132 and a registration means 113.
  • the correspondence search means 1 1 3 1 receives the IP bucket passed from the packet receiving means 1 1 2 1 to the address conversion means 1 1 2 5.
  • the value of the first socket field is transmitted from the correspondence management table of the storage means 112 127 to the transmission of this IP bucket.
  • the registration means 1 1 3 3 Upon receiving the IP bucket, the registration means 1 1 3 3 generates an unused entry identifier and selects one of the unused port numbers. Then, the registration means' 1 1 3 3 uses this entry identifier as the value of the entry identifier field, and registers each of the set of the source address and the source port number and the set of the destination address and the destination port number of this IP bucket. Take the values of the first socket field and the second socket field. Next, the registration means 1 1 3 3 sets the set of the IP address of the global network 1 150 in the NAPT relay apparatus 1 1 20 and the selected port number as the value of the third socket field. An entry is created, and this entry is stored in the correspondence management table 272 of the storage means 1 127. And the registration means 1 1 3 3 3
  • the address conversion means 1 126 comprises a correspondence search means 1 141 and a bucket conversion means 1 142.
  • the correspondence search means 1 141 When receiving the IP bucket from the bucket receiving means 1 123, the correspondence search means 1 141, based on the correspondence management table of the storage means 112, stores the value of the second socket field of this IP bucket. Search for an entry that is equal to the source address and source port number pair and that the value of the third socket field is equal to the destination address and destination port number pair of this IP bucket. If the corresponding entry is detected by this search, the corresponding search means 1141 passes this IP bucket and the entry identifier stored in the entry identifier field of this entry to the bucket conversion means 1142 . If the corresponding entry is not detected by this search, the corresponding search means 1 141 discards this IP packet because the destination of this IP packet is not known.
  • the terminal device 110 starts a communication session between the port “P_t” of the terminal device 110 and the port “P-s” of the server device 110. Therefore, the first IP bucket (referred to as IP bucket A) between the port “Pt” of the terminal device 110 and the port “Ps” of the server device 110 must be private. The operation when the packet is transmitted to the network 104 will be described.
  • the IP bucket A has a destination address of the IP address “Ag—s” of the server device 113 and a source address of the IP address “Ap_t” of the terminal device 110. Yes, and the destination port number in the transport layer protocol header included in IP bucket A is "P-s", and the source port number is "F_t”. Also, it is assumed that no entry is registered as an initial state in the correspondence management table of the storage means 1 127.
  • the corresponding search means 1 13 1 passes the IP packet A to the registration means 1 13 3 because the above-mentioned entry was not detected in the above search.
  • the registration means 1 1 3 3 When the IP packet A is passed, the registration means 1 1 3 3 generates an unused entry identifier, and generates a port number which is not used in the NAPT repeater 1 1 In this case, select one “F_r”. Then, the registering means 1 1 3 3 uses the entry identifier as the value of the entry identifier field, sets the pair “Apt—Pt” of the source address and the source port number of the IP bucket A, and the destination address. And the pair of destination port numbers “Ag-s, P-s” are the respective values of the first socket field and the second socket field. Also, the registration means 113 is a set “Ag-r, P-r” of the IP address of the global network 1150 of the NAPT relay device 112 and this selected port number. Is created as a value of the third socket field, and this entry is stored in the correspondence management table of the storage means 1 127. Then, the registering means 113 transfers this IP packet A and the entry identifier to the packet converting
  • the bucket converting means 1 1 3 2 converts each of the source address “Apt” and the source port number “Pt” of this IP bucket A into a packet.
  • the IP address "Ag-r" and the port number "P-r” shown in the third socket field in the entry of the correspondence management table identified from this entry identifier are rewritten to the respective values.
  • the packet (called IP packet B) is passed to the packet transmitting means 102.
  • the IP bucket B sent from the NAPT relay device 112 is received by the server device 110 via the global network 115.
  • the server apparatus 1 0 3 based on the contents of the source address, the source port number, the destination address, and the destination port number included in the IP bucket B, transmits the IP packet B with the IP address “Ag—r”.
  • the destination address “A g—r”, the destination port number “P—r”, the source address “A g—s”, and the source port number “F—s” for this IP packet.
  • the NAPT relay apparatus 1120 when receiving the IP bucket (referred to as IP bucket C) of this communication session from the private network 1140, the NAPT relay apparatus 1120 performs the same processing as the above-described processing of the IP bucket A. It works, but the corresponding search means 1 1 3 1 In this case, the correspondence search means 1 1 3 1 reads the value of the first socket field from the correspondence management table of the storage means 1 1 27 into the set “A” of the source address and the source port number of this IP bucket C. p—t, P—t ”and the value of the second socket field has a value equal to the destination address and destination port number pair“ A g—s, P—s ”of this IP bucket C. Detect entry. Next, the correspondence search means 1 13 1 passes the IP bucket C and the entry identifier of the detected entry directly to the bucket conversion means 1 13 2 without passing through the registration means 1 13 3.
  • Subsequent processing in the bucket converting means 1 1 3 2 is performed in the same manner as in the case of the above-mentioned IP bucket A, and this IP bucket C has the same source address “Ag-r” as the above-mentioned IP bucket B and the source port. It is converted into an IP bucket having the number “Pr” (called IP bucket D), and the converted IP bucket D is sent to the super-user device 1 130 via the global network 1 150. Sent.
  • IP bucket E the IP packet (referred to as IP bucket E) of this communication session transmitted from the server apparatus 1130 after processing the above-mentioned IP bucket A and IP bucket B has the destination address “A g— r ", destination port number” P-r “, source address” Ag_s ", and source port number” P_s "are set.
  • the packet is received by the bucket receiving means 1 123 of the NAPT relay apparatus 112 via The bucket receiving means 1 1 2 3 passes this IP packet E to the address converting means 1 1 2 6.
  • the IP bucket E passed to the address translating means 1 126 is received by the corresponding searching means 1 141.
  • the correspondence search means 1 141 reads the value of the second socket field of this packet E from the correspondence management table of the storage means 1 127.
  • the source address and port number pair “g_s, P—s” is equal, and the value of the third socket field is the destination address and destination port number pair “Ag” of this IP bucket E. — Search for entries equal to "r, P_r".
  • the correspondence management table there is an entry registered when processing the above-mentioned IP bucket A, and since this entry corresponds to the above-mentioned entry to be searched, the correspondence search means 1 141 1 E and the entry identifier of this entry are passed to the packet conversion means 1 1 4 2.
  • the packet conversion means 1 1 4 2 passes the above-mentioned IP packet E and the above-mentioned entry identifier. Then, the destination address “Ag—r” and the destination port number “P_r” of the IP bucket E are respectively assigned to the IF address “Ap” of the first socket in the entry of the correspondence management table identified from this entry identifier. —T ”and the port number“ P—t ”, and pass the rewritten IP bucket (called IP bucket F) to the bucket transmitting means 1 1 2 4.
  • the bucket transmitting means 1 124 Upon receiving the IP bucket F, the bucket transmitting means 1 124 sends out the IP packet F to the private network 114.
  • the IP packet F sent from the N APT relay device 1 120 is received by the terminal device 1 1 1 10 via the private network 1 1 40.
  • a socket composed of a set of a private address and a port number by the NAPT relay device 111 and a global address and a port number are used.
  • One communication session identified by a pair with a socket composed of a set is associated with one set of a global address and a port number, and a private network is used for relaying.
  • IP communication between a device connected to the base network 1140 and a device connected to the global network 1150 is enabled.
  • the server device needs to know the IP address of the terminal device from the name of the terminal device, but the address cannot be resolved at this time.
  • the communication system when communication is performed between a super network device connected to the global network and a terminal device connected to the private network, the communication system is connected to the private network. Although it is possible to start communication from a terminal device to a super-device connected to the global network, communication cannot be started from a server device, which is not preferable.
  • an object of the present invention is to provide a terminal device, a relay device, a communication method, and a communication program that can start data communication. Disclosure of the invention
  • data communication can be started between terminal devices connected to a plurality of networks configured by different address systems regardless of a global network and a private network. It concerns communication methods.
  • the first network and the second network having a different address system from the first network are connected via a relay device, and the relay device is connected to the first network.
  • At least one first entry including the address of the first terminal device connected to the first terminal device and the service identifier of the service provided by the first terminal device is stored in the first management table. .
  • the relay device receives the bucket, and receives the bucket from the first management table. Searches for the first entry with the same service identifier as the destination service identifier contained in the packet and finds the destination address of that bucket. The address of the first terminal device in the first entry is rewritten, and the bucket is transmitted to the first terminal device.
  • FIG. 3 is a block diagram showing an example of a partial configuration of FIG. 2,
  • FIG. 5 is a system configuration diagram showing a first embodiment of the present invention by blocks
  • FIG. 6 is a block diagram showing one form of one address conversion means in FIG. 5,
  • FIG. 7 is a block diagram showing one form of the other address conversion means in FIG. 5,
  • FIG. 8 is a diagram showing a configuration of a table in the storage means of FIG. 5
  • FIG. 9A is a diagram showing a configuration of a data IP bucket used in FIG. 5, and
  • FIG. The figure shows one configuration of the IP bucket for the address resolution inquiry message used in FIG.
  • FIG. 9C is a diagram showing one configuration of an IP bucket for an address resolution response message used in FIG. 5,
  • FIG. 9D is a diagram showing a configuration of a bucket in the network 4 used in FIG. 5,
  • FIG. 10 is a sequence diagram showing one procedure of a main operation in FIG. 5, and FIG. 11 is a block diagram showing one mode of a network configuration in the present invention.
  • FIG. 12 is a block diagram showing a second embodiment of the present invention.
  • FIG. 13 is a sequence diagram showing one procedure of the main operation in FIG. 12, and
  • FIG. FIG. 12 is a sequence diagram showing one procedure of a main operation different from FIG. 13 in FIG. 12;
  • FIG. 15 is a block diagram showing a third embodiment of the present invention
  • FIG. 16 shows another form of the other address conversion means in FIG. 15 in FIG. It is a block diagram
  • FIG. 17 is a diagram showing one configuration of a table in the storage means of FIG. 15, and FIG. 18 is a sequence diagram showing one procedure of main operation in FIG.
  • FIG. 14 is a block diagram showing a fourth embodiment of the present invention.
  • FIG. 20 is a block diagram showing one form of one address conversion means in FIG.
  • FIG. 21 is a block diagram showing one form of the other address conversion means in FIG.
  • FIG. 22 is a diagram showing one configuration of the storage means in FIG. 19;
  • FIG. 25 is a block diagram showing the configuration of a second embodiment according to the present invention.
  • FIG. 26 is a diagram showing one configuration of a table of storage means used in the embodiment of FIG. It is. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 5 is a system configuration diagram showing a first embodiment of a terminal device, a relay device, and a communication method thereof according to the present invention.
  • the illustrated communication system includes a plurality of terminal devices 1 _ 1 to 1, a relay device 2, a terminal device 3, a private network 4, and a global network 5. ing.
  • the illustrated private network 4 and global network 5 are networks to which different address systems are applied. Therefore, for comparison with the above-described conventional technology, the private network 4 and the global network 5 are defined as follows.
  • the private network 4 is a network that provides a data transfer service, such as an IP network, an ISDN network, and a mobile communication network, assuming a network composed of IP or other technologies.
  • a local network bucket carrying user data and control information between the terminal device 1_x and the relay device 2 (hereinafter referred to as a local bucket) is transferred.
  • the global network 5 is assumed to be an IP network using global addresses. In the global network 5, an IP packet carrying an address resolution inquiry message for performing an inquiry for address resolution between the relay device 2 and the terminal device 3, and an address resolution response message responding to the address resolution inquiry.
  • the IP bucket carrying the IP packet and the IP bucket carrying other control information or user data are transferred.
  • the terminal device 11X has a communication function that can be used in the private network 4, and is an information processing device equipped with a communication program that communicates with the communication program of the terminal device 3 using this communication function. is there.
  • Each of the terminal devices 11-X is assigned a terminal device name and one address of the private network 4, for example, Al-x.
  • the terminal device name is composed of the information of the network to which this terminal device is connected, such as the FQDN (Fu1 1 y Qualified Domain Name) format, and an identifier that can be uniquely identified within this network.
  • Other terminal devices It is used by the device or other terminal programs or users to identify this terminal.
  • the relay device 2 includes packet receiving means 21 and 23, packet transmitting means 22 and 24, address conversion means 25 and 26, storage means 27, and address inquiry response means 28.
  • One address “for example, Al-r” of the private network 4 and one IP address “for example, A2-2” of the global network 5 are assigned to the relay device 2. I have.
  • the terminal device 3 is a terminal device used on the existing Internet, has a communication function using TCP / IP, and has a communication program for communicating with the communication program of the terminal device 11X using the communication function. Information processing equipment.
  • the terminal device 3 is assigned a terminal device name and one address of the global network 5 “for example, A2-1”.
  • the terminal device name like terminal device 1-X, is composed of information on the network to which this terminal device is connected, such as FQDN format, and an identifier that can be uniquely identified within this network.
  • the terminal, or other terminal program or user, is used to identify this terminal.
  • the terminal device 3 has an address resolving means.
  • the address resolving means starts communication with another terminal device, the terminal device 3 obtains the IP address of this terminal device (or this terminal device To the IP address of the device that is the destination of the IP bucket to be sent to.
  • This address resolution method is realized by the DNS (Doma in Name System) technology described in "D ⁇ MAIN NAME S one IMPLEMENTAT I ON AND S PEC IF ⁇ CAT I ON" in RFC 1035. I have.
  • the bucket receiving means 21 receives a packet addressed to the global network 5 sent from the private network 4 and passes the received packet to the address translating means 25.
  • the packet transmitting means 22 transmits the IP bucket passed from the address converting means 25 to the global network 5.
  • the bucket receiving means 23 receives the IP bucket addressed to the private network 4 sent from the global network 5 and passes the received IP bucket to the address conversion means 26.
  • the bucket transmitting means 24 sends out the local bucket passed from the address conversion means 26 to the private network 4.
  • the address conversion means 25 includes correspondence search means 251, packet conversion means 252, and registration means 253.
  • the address conversion means 26 is composed of a correspondence search means 261, a packet conversion means 262, a registration search means 263, and a registration means 264.
  • the storage means 27 has a processing terminal registration table 271, and a corresponding management table 272 as shown in FIG.
  • each of the processing terminal registration table 271 and the correspondence management table 271 will be described prior to the description of the respective means shown in FIGS. 6 and 7.
  • the processing terminal registration table 27 1 has an entry identifier field for storing a value of a first entry identifier for uniquely identifying an entry of the processing terminal registration table 27 1 in the relay device 2. It has a set of an address field for storing the address of the private network 4 and a port number field for storing a port number.
  • the bucket converting means 25 52 converts the local bucket into an IP bucket.
  • the bucket conversion means 25 52 identifies the source address and source port number of this IP bucket in the corresponding socket entry in the correspondence management table 272 identified by the corresponding second entry identifier.
  • the IP address and the port number shown in the field are rewritten to the values, and the rewritten IP bucket is passed to the bucket transmitting means 22.
  • the registration means 253 generates an unused second entry identifier when the local bucket is passed, and selects one unused port number.
  • the power operation monitoring means 11 detects the operation of turning on the power, and Notify the registration request transmitting means 12 of ON.
  • the registration request transmitting means 12 refers to the service list provided in the storage means 15 and compares the port number list including all the port numbers set in the provided service list with the address of the terminal device 1a. A registration request message including the registration request message is created in the local bucket, and transmitted to the relay device 2a via the private network 4 (step S12).
  • the relay device 2a starts accepting data communication from the terminal device 3 addressed to the registered port number of the terminal device 1a, and becomes capable of relaying.
  • the operation confirmation request message is received by the operation confirmation response unit 14 of the terminal device 1a, and the operation confirmation response unit 14 converts the operation confirmation response message, which is a response to the operation confirmation request message, into a low-power packet. It is created and transmitted to the relay device 2a via the private network 4 (step S15).
  • the operation confirmation request means 293 stops transmitting the operation confirmation request message to the terminal device 1a, which has been performed periodically, and the terminal device The checking operation for the device 1a is completed (step S19).
  • the operation confirmation requesting means 293 may expire (step S34) without receiving the operation confirmation response message which is a response to the operation confirmation request message.
  • the operation confirmation requesting means 293 detects that the operation of the terminal device 1a has stopped (step S35), and the value of the address field is determined from the processing terminal registration table of the storage means 27. All entries equal to the address of the terminal device 1a are deleted, and the confirmation operation to the terminal device 1a ends (step S36).
  • the relay device 2a When receiving the data IP bucket from the global network 5, the relay device 2a operates in the same manner as in the first embodiment described above.
  • the provided service list set in the terminal device 1a is registered in the relay device 2a when the terminal device 1a is started, and the relay device 2a is registered when the terminal device 1a ends. Since it is deleted from a, the information depending on the setting of the terminal device 1a can be automatically registered in the relay device 2a, and when the terminal device 1a operates, the data for the data from the global network 5 is used. Although the IP packet is relayed to the terminal device 1a, it becomes possible not to relay the overnight IP packet from the global network 5 to the terminal device 1a when the terminal device 1a is not operating.
  • terminal device A connected to the ith non-global network 1 2 i (where “i” is one of “1, 2,..., N”)
  • the operation of the i-th relay device 11 i with respect to the j-th relay device 11 j and its terminal device B This is because the operation becomes the same as the operation for the terminal device 3 in the first embodiment.
  • the address system of the transit network 110 is the i-th non-global network 12 i address system and the j-th non-global network It must be different from any of the 12 j addressing schemes.
  • the terminal device 1b is configured by adding the capability information to the configuration of the terminal device 1a in the second embodiment shown in FIG.
  • the relay device 2b further includes transmission means 16 and the relay device 2b further includes a capability information receiving device 2994 in addition to the configuration of the relay device 2a in the second embodiment shown in FIG. It has.
  • a processing capability information field is added to the entry of the processing terminal registration table 27 1 b stored in the storage means 27 b of the relay device 2 b.
  • the storage device 15b of the terminal device 1b stores the processing capability information of the terminal device 1b
  • the processing capability information of the terminal device 1b stored in the storage device 15b stores the processing capability information of the terminal device 1b.
  • This information includes, for example, information relating to the processing capability of the CPU and the processing / display capability of various media such as text, audio, and images.
  • the capability information receiving unit 294 of the relay device 2b receives the capability notification message transmitted from the terminal device 1b, and receives the address field from the processing terminal registration table 271b of the storage unit 27b. An entry whose value is equal to the terminal device 1b included in the capability notification message is searched, and the correspondence of the processing capability information included in the capability notification message is stored in the processing capability information field of this entry.
  • the destination selecting means 2 65 of the address conversion means 26 b receives the one or more first entry identifiers and one IP bucket from the registration / search means 26 3, and stores the information in the storage means 2.
  • the entry identified by the notified one or a plurality of first entry identifiers is read from the processing terminal registration table 2 7 1b of 7b.
  • the destination selection means 265 further reads the processing capability information of each terminal device from the read entry, compares the read processing capability information, and selects one optimal terminal device.
  • the destination selection means 265 notifies the registration means 264 of the selected pair of the address and the port number and the IP bucket.
  • the power operation monitoring means 11 is turned on by the power supply monitoring unit 11 in the same manner as the operation in the above-described second embodiment.
  • the ON information is notified to the registration request transmitting means 12, and the registration request transmitting means 12 sends a registration request message including the address of the terminal device 1 b and a list of port numbers corresponding to the services provided by the terminal device 1 b.
  • a registration request is made by transmitting a packet to the relay device 2b (step S42).
  • the registration request receiving means 291 of the relay device 2b receives the registration request message, and stores the port number list and the address contained in the registration request message in the storage means 27b. Create entry 1b.
  • the registration request receiving means 29 1 stores the created entry in the processing terminal registration table 27 1 b and starts the operation check of the terminal device 1 b by the operation check requesting means 29 3 (step S 4 3 ) Then, the operation check procedure from step S14 to step S16 in FIG. 13 is executed.
  • the power operation monitoring means 11 also notifies the power information ON means 16 of the power ON information.
  • the capability information transmitting means 16 reads the processing capability information of the terminal device 1b stored in the storage means 15b, and reads the processing capability information and the address of the terminal device 1b. Then, a capability notification message including the message is created, and the capability information is notified by transmitting a packet of the capability notification message to the relay device 2b (step S44).
  • the capability notification message transmitted to the relay device 2b is received by the capability information receiving unit 294.
  • the capability information receiving means 294 searches the processing terminal registration table 271b of the storage means 27b for an entry whose address field value is equal to that of the terminal device 1b included in the capability notification message.
  • the processing capacity information included in the capacity notification message is stored in the processing capacity information field of this entry.
  • the relay device 2b receives the IP packet for data from the global network 5
  • the IP bucket is received by the bucket receiving means 23, and the bucket receiving means 23 transmits the IP packet to the first packet.
  • this IP packet is passed to the correspondence search means 261, and the correspondence search means 2661 also receives the second socket from the correspondence management table of the storage means 27b in the same manner as described above.
  • the search is made for an entry in which the value of the source field and the value of the third socket field are equal to the pair of the source address and the source port number and the pair of the destination address and the destination port number of this IP bucket, respectively.
  • the correspondence search means 2661 performs processing in the same manner as in the above-described first embodiment, regardless of whether this entry is detected by this search or not. In particular, when this entry is detected, the subsequent processing is the same as the operation in the above-described first embodiment, and a description thereof will not be repeated.
  • the registration search means 2 63 reads from the processing terminal registration table 27 1 b of the storage means 27 b. Searches for entries where the value of the port number field is equal to the destination port number of this IF bucket.In this case, if one or more of the search results is found, this detected All first The entry identifier and this IP packet are passed to the destination selection means 265.
  • the destination selection means 265 reads out the entry identified by the passed first entry identifier from the processing terminal registration table 271b of the storage means 27b.
  • the destination selection unit 2665 further reads the processing capability information of each terminal device from the read entry, compares the read processing capability information, and selects one optimal terminal device.
  • the communication from the global network 5 is performed. It is possible to avoid relaying an IP bucket, which starts data communication upon reception of the packet to the terminal device 1b that cannot communicate.
  • the port number system in the private network 4 and the port number system in the global network 5 are the same.
  • the first port number field for storing the port number of the private network 4 in the storage means 27 c of the relay device 2 c and the global A port table 273c having an entry consisting of a second port number field for storing the port number of the global network 5 is provided, and the same service is provided by this port table 273c.
  • the relay device 2 manages the correspondence between the corresponding port numbers of the private network 4 and the port numbers of the global network 5.
  • Means refer to the first port number field as the port number on the private network 4 side, and refer to the second port number field as the port number on the global network 5 side. It is characterized by: As a result, even when the private network 4 and the global network 5 have different port numbering systems, communication between the terminal device 11X and the terminal device 3 becomes possible.
  • the processing terminal registration table 2 71 c and the correspondence management table 2 72 2 c are different from each other in the configuration, use, and method of use in the processing terminal registration table 2 71 in the first embodiment. It is equal to 7 1 and the correspondence management table 2 7 2.
  • the port number in the private network 4 is stored in the port number field of the processing terminal registration table 27 1 c. Also, the port number in the private network 4 is stored in the port number indicated in the first socket field of the correspondence management table 272c. Further, the port number of the global network 5 is stored in the port number shown in the second socket field and the port number shown in the third socket field.
  • the port table 2 73 c added in the fourth embodiment includes a first port number field for storing a port number of the private network 4 and a port number field of the global network 5. It has an entry consisting of a second port number field to be stored, and the correspondence between the port number of the private network 4 and the port number of the global network 5 corresponding to the same service is stored in advance. For example, assuming that the port number corresponding to the FTP service has a value of “10” in the private network 4 and a value of “20” in the global network 5, as shown in FIG. These correspondences are stored.
  • the correspondence search means 25 1 c receives the personal bucket passed from the bucket receiving means 21 to the address conversion means 25 c.
  • the local bucket is passed from the bucket receiving means 21 to the corresponding search means 25 1 c, first, the value of the first port number field is read from the port table 27 3 c of the storage means 27 c. Search for an entry equal to the value of the bucket destination port number.
  • the correspondence search means 25 1 c discards this local packet and ends the processing.
  • the correspondence search means 25 1 c reads the value of the first socket field from the correspondence management table 2 73 c of the storage means 27 c, and Equal to the set of source address and source port number, and The value of the second socket field is the destination address of this packet and the second port number in the entry in the port table 27.3c detected in the search of the port table 27.3c. Search for an entry with a value equal to the value pair with the field.
  • the packet conversion unit 25 2 c When the packet conversion unit 25 2 c receives the verbal packet and the second entry identifier, it converts the local bucket into an IP packet, and transmits a source address and a source port of the IP packet.
  • a correspondence management table 272 that identifies the number and the second entry identifier, respectively. Rewrite to the IP address and port number values shown in the third socket field in the entry.
  • the bucket converting means 25 2 c further rewrites the destination address and the destination port number of this IP bucket to the IP address and port number indicated in the second socket field of this entry, and The IP bucket is passed to the bucket transmitting means 22.
  • the registration means 25 3 c searches the port table 2 73 c for an entry having the destination port number of this mouth packet as the value of the first port number field, and searches for the entry. Read the corresponding second port number and generate an unused second entry identifier. The registration means 25 3 c selects one unused port number in the global network 5. Then, the registering means 253 c sets the generated second entry identifier as the value of the entry identifier field, and uses the pair of the source address and the source port number of the local packet as the first socket field. And the value pair of the destination address of the parentheses in the local bucket and the second port number field entered in the port table 273c detected by this search as the value of the second socket field. I do.
  • the registration means 25 3 c creates an entry in which the pair of the IP address of the global network 5 of the relay device 2 c and the selected port number is set as the value of the third socket field. , This entry is stored in the correspondence management table 2 7 2 c of the storage means 27 c To memorize. Further, the registering means 253 c sets the source port number of the local bucket as the value of the first port number field, and uses the selected port number as the value of the second port number field. An entry of the port table 273c to be created is created, and this entry is registered in the port table 273c. Then, the registration means 2553c passes the local bucket and the second entry identifier to the bucket conversion means 2525c.
  • FIG. 21 shows the configuration of the address conversion means 26c in the fourth embodiment.
  • the address conversion means 26c is composed of a correspondence search means 261c, a bucket conversion means 2626c, a registration search means 2663c, and a registration means 2664c.
  • the elements having the same names as those constituting the address conversion means 26 in the first embodiment are denoted by the same reference numerals, and “c” is added to each number code.
  • the connection of the components is also the same as in the first embodiment.
  • the bucket converting means 2626c converts the IP bucket into a local bucket of the private network 4, and stores the destination address and the destination port number of the private bucket in the second entry identifier, respectively. Is rewritten to the value of the IP address and port number of the first socket in the entry of the correspondence management table 272c, which is identified from.
  • the packet conversion means 262c further rewrites the source port number of this packet to the value of the first port number field in the entry of the port table 273c read out above, The local bucket is passed to the bucket transmitting means 24.
  • the registration search means 263c discards this IP packet and ends the processing.
  • the registration search means 2 63 c further refers to the processing terminal registration table 27 1 c and sets the value of the port number field as a value. The entry having the value of the first port number field in the entry of the detected port table 273c is searched.
  • the registration search means 263c discards the IP bucket and ends the processing.
  • the registration search means 26 3 c uses the value of the first entry identifier stored in the entry identifier field of this entry and this IP Pass the bucket and the registration means to 264c.
  • the registration means 2664c Upon receiving the first entry identifier and the IP bucket, the registration means 2664c receives the first entry identifier and the IP bucket, and the entry in the processing terminal registration table 2711c of the storage means 27c identified by the first entry identifier. And reads the address stored in the address field and the port number stored in the port number field, and generates an unused second entry identifier.
  • the registration means 264c sets the generated second entry identifier as a value of an entry identifier field, sets a pair of this address and this port number as a value of a first socket field, and Create an entry that uses the pair of the source address and source port number of the IP bucket as the second socket field, and the pair of the destination address and destination port number of this IP bucket as the value of the third socket field. I do.
  • the registration means 264c stores the created entry in the correspondence management table 272c of the storage means 27c.
  • the registration means 264c selects one of the unused port numbers of the network 4, sets the selected port number as the value of the first port number field, and sets the value of the IP packet in parentheses. Create a port table entry with the source port number as the value of the second port number field. The registration means 264c registers the entry of the created port table in the port table 273c. Then, the registering means 264c passes the IP bucket and the second entry identifier to the bucket converting means 262c.
  • the terminal device 11X transmits the first local bucket (called local packet A) to use the above service.
  • the destination address is ⁇ 2—1 ”
  • the destination port number is“ P4 ”
  • the source address is“ A1x ”
  • the source port number is“ P1 ”.
  • the local bucket A sent from the terminal device 1 -X is received by the bucket receiving means 21 of the relay device 2 c via the private network 4.
  • the packet receiving means 21 passes the local bucket A to the address translating means 25c.
  • the low-power packet A passed to the address conversion means 25c is received by the correspondence search means 251c.
  • the corresponding search means 25 1 c Upon receiving the above-mentioned local bucket A, the corresponding search means 25 1 c firstly reads the value of the first port number field from the port table 27 3 c of the storage means 27 c into this local bucket. Search for an entry that is equal to the destination port number value "P 4" of the server. In this case, since this entry exists in the port table 273c, this entry is detected by this search.
  • the correspondence search means 25 1 c passes this local bucket A to the registration means 25 3 c.
  • the destination port number “P 4” of the local bucket A is set to the value of the first port number field from the port table 2 73 c. It searches for the entry that has it, generates an unused second entry identifier, and selects one unused global network 5 port number (let the selected port number be “P 5”).
  • the registration means 25 3 c sets the source port number “P 1” of this packet A as the value of the first port number field, and uses the selected port number “P 5” as the second port number. Create an entry for the port table 273c as the value of the field and register it in the port table 273c. Then, the registering means 2553c passes the raw bucket A and the second entry identifier to the bucket converting means 2525c.
  • the destination address of IP bucket B is ⁇ 2—1 ”, the destination port number is“ P 2 ”, the source address is“ A 2-2 ”, and the source port number is“ P 5 ” Therefore, in the terminal device 3, this communication session is a communication session between the port “P5” of the terminal device having the address “A2-2” and the port “P2” of the own terminal device. Will be interpreted. Therefore, the IP packet transmitted from the terminal device 3 relating to this communication session has the destination address “A2-2”, the destination port number “P5”, and the source address ⁇ 2—. 1 ”and the source port number is“ P 2 ”.
  • the central device 2c receives the personal packet (referred to as local bucket C) of this communication session from the private network 4, it operates in the same manner as the processing of the personal packet A described above. However, in the process of searching the correspondence management table of the correspondence search means 25 1 c, this time is different.
  • this local bucket C has the same source address ⁇ 2-2 ”, source port number“ P 5 ”and destination address ⁇ 2-1” as the above IP bucket B, and the destination port number “
  • the packet is converted into an IP packet having “P 2” (the converted IF packet is called IP packet D), and the converted IP packet D is sent to the terminal device 3 via the global network 5.
  • the local bucket A and the IP bucket (referred to as IP bucket E) of this communication session transmitted from the terminal device 3 after processing the IP bucket B have a destination address of ⁇ 2 —2 ”, the destination port number is“ P5 ”, the source address is“ A2-1 ”, and the source port number is“ P2 ”.
  • This IP bucket E is received by the bucket receiving means 23 of the relay device 2c via the global network 5, and the packet receiving means 23 passes this IP bucket E to the seven-dress conversion means 26c.
  • the IP bucket E passed to the address conversion means 26c is received by the correspondence search means 261c.
  • Correspondence search means 2611c determines from the correspondence management table 272c of storage means 27c that the value of the second socket field indicates the source address and source port number of this IP bucket E. Search for an entry that is equal to the pair [A 2-1, P 2] and the value of the third socket field is equal to the pair [A 2-1, P 5] of the destination address and destination port number of this IP packet I do.
  • the correspondence search means 2 6 1 c passes this IP bucket E and the entry identifier of this entry to the bucket conversion means 26 2 c.
  • the bucket converting means 262 c stores the port table 273 of the storage means 27c. Search for an entry having the source port number “P 2” of this IP bucket in the second port number field, and find the first port number in the entry of the detected port table 273 c. Read the value “P 4” in the field. Then, bucket conversion means 262. Converts the IP packet E into a private packet of the private network 4, and stores the destination address and the destination port number of the local bucket respectively in the correspondence management table 27 identified by the second entry identifier.
  • the bucket transmitting means 24 sends the bucket F to the private network 4, and the local bucket F is received by the terminal device X.
  • the port number at is “F 1” and the port number at global network 5 is “F 5”. Also, in order to indicate this correspondence, the value of the first port number field is “P 1” in the port table 273 c and the value of the second port number field is “P 1 5 ”is registered. It is also assumed that the correspondence between the address “A 1 ⁇ x” and the port number “P 1” is stored in the processing terminal registration table 27 1 c. Further, it is assumed that the terminal device 3 uses the port having the port number “P 2”.
  • the terminal device 3 Before transmitting the first IP bucket (referred to as IP bucket A) to use the service, the terminal device 3 first transmits the terminal device 11X in the same manner as the operation in the first embodiment described above. It resolves the address from the name and finds that the destination IP address of the IP bucket addressed to the terminal device 1-X is “A2-2”. The details have already been described, and the description is omitted.
  • the terminal device 3 sends out the IP bucket A.
  • the destination address is “A2-2”
  • the destination port number is “P5”
  • the source address is “A2-1”
  • the source port number is “ P 2 ”.
  • the IP bucket A passed to the address conversion means 26c is received by the correspondence search means 261c.
  • the correspondence search means 26 1 c receives the values of the second socket field and the third socket field from the correspondence management table 27 2 c of the storage means 27 c.
  • Each is a pair [A 2-1, P 2] of the source address and the source port number of this IP packet A, and a pair [D-2] of the destination address and the destination port number of this IP packet A [ A2—2, P5].
  • the corresponding search means 2631c passes this IP bucket A to the registration search means 2663c.
  • the registration search means 2663c Upon receiving the above IP bucket A, the registration search means 2663c sets the destination port number "P5" of this IP bucket A to the value of the second port number field from the port table 273c. Search for an entry.
  • the registration search means 263c further refers to the processing terminal registration table 271c to find this entry as the value of the port number field.
  • a search is made for an entry having the value “P 1” in the first port number field in the entry of the created port table 2 7.3 c.
  • the correspondence between the address “A 1 — x” and the port number “P 1” is stored in the processing terminal registration table 27 1 c, and this entry is detected.
  • the registration search means 2 63 c reads the value of the first entry identifier stored in the entry identifier field of this entry and this IP Pass the bucket A to the registration means 264c.
  • the registration means 264c Upon receiving the first entry identifier and the IP packet A, the registration means 264c registers the processing terminal registration table of the storage means 27c identified by the first entry identifier. —Read the address “A 1—x” stored in the address field and the port number “P 1” stored in the port number field in the entry of the entry 2 Generate an entry identifier for
  • the registration means 264c uses the generated second entry identifier as the value of the entry identifier field, and sets the pair [A l_x, P 1] of this address and this port number in the first socket field.
  • the pair [A 2-1, P 2] of the source address and source port number of this IF bucket A is the value of the second socket field, and the destination address of the parenthesized IP bucket is An entry is created using the pair [A2-2, P5] with the destination port number as the value of the third socket field, and this entry is registered in the correspondence management table of the storage means 27.
  • the illustrated correspondence management table 272c is completed.
  • the registration means 2 6 4 c selects one unused port number of the private network 4 (the selected port number is referred to as “P 4”), and selects the selected port number “F 4 J as the first port number. Creates a port table entry with the source port number "P2" of this IP bucket A as the value of the second port number field, and the entry of this port table. Is registered in port table 2 7 3 c. As a result, the illustrated port table 273c is completed. Then, the registration means 264c passes the IP bucket A and the second entry identifier to the bucket conversion means 262c.
  • the bucket conversion means 2626 c reads the source port of this IP bucket A from the port table 273 c of the storage means 27 c.
  • the entry having the number “P 2” in the second port number field is searched, and the value “P 4” of the first port number field in the entry of the detected port table 273 c is read.
  • the packet transmitting means 24 Upon receiving the packet B, the packet transmitting means 24 sends out the local bucket B to the private network 4, and the packet B is received by the terminal device 11X.
  • the destination address of mouth packet B is “A 1 -x”, the destination port number is “P 1”, the source address is ⁇ 2—1 ”, and the source port number is“ P 4 ”. Therefore, in the terminal device 1 X, this communication session is a communication session between the port “P 4” of the terminal device with the address “A 2-1” and the port “P 1” of the own terminal device. Is interpreted as Therefore, the local bucket sent from the terminal device 1-X for this communication session has the destination address “A2-1”, the destination port number “P4”, and the source address “ ⁇ ”. 1— ⁇ ”and the source port number is“ P 1 ”.
  • the relay device 2 c When receiving the IP packet (referred to as IP packet C) of this communication session from the global network 5, the relay device 2 c operates in the same manner as the processing of the IP packet A described above, but the corresponding search means It differs in the process of searching the correspondence management table in 26 1 c.
  • this IP bucket C has the same source address "A2-2-2", source port number "P4", destination address "A1-x”, and destination port number "P It is converted to a local packet with 1 ”(called local packet D).
  • the converted local packet D is sent to the terminal device 11X via the private network 4.
  • the terminal device 1 after processing the IP bucket A and the local bucket B described above.
  • the mouth packet of this communication session (called the local bucket E) transmitted from 1x has a destination address “A2-1” and a destination port number “P4”.
  • the source address is “A 1—x” and the source port number is “P 1”.
  • This oral packet E is received by the bucket receiving means 21 of the relay device 2 via the network 4.
  • the bucket receiving means 21 passes this roll packet E to the address translating means 25c.
  • the mouth packet E passed to the address conversion means 25 c is received by the correspondence search means 25 1 c.
  • the corresponding search means 25 1 c firstly reads the value of the first port number field from the port table 27 3 of the storage means 27 c to this local bucket E. Search for an entry that is equal to the destination port number value "P4" of the.
  • the entry table s registered at the time of processing the IP packet A exists in the port table 273 c, and this entry corresponds to the entry to be searched.
  • the value of the first socket field is a set of the source address and the source port number [A1—x, P 1] and the value of the second socket field is the destination address of this local bucket E and the second port of the entry in the port table found in the search for the port table. Searches for an entry whose value is equal to the pair [A 2-l, P 2] with the value of the field number field.
  • the correspondence management table 2721c contains the entry registered at the time of the IP bucket A processing, and since this entry corresponds to the entry to be searched, the correspondence search means 2511c uses this local bucket.
  • the packet E and the second entry identifier stored in the entry identifier field of this entry are passed to the bucket conversion means 255c. .
  • the bucket converting means 25 2 c converts the local bucket E into an IP bucket, and transmits the address of the source of the IF bucket. And the source port number are respectively identified by the second entry identifier.
  • the IF address ⁇ 2 — 2 J and the PO address indicated in the third socket field in the entry of the correspondence management table 272 c are identified from the second entry identifier. Rewrite the value with the default number “P 5”.
  • the bucket conversion means 2 52 2 c further includes a destination of this IP bucket. The address and the destination port number are rewritten to the IP address “A2-1” and the port number “P2” shown in the second socket field of this entry, and the rewritten IP packet (called IP packet F) To the packet transmission means 22.
  • the bucket transmitting means 22 Upon receiving the IP bucket F, the bucket transmitting means 22 sends the IP bucket F to the global network 5, and the IP bucket is received by the terminal device 3.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
  • Communication Control (AREA)

Abstract

La présente invention concerne un dispositif relais (2) qui comprend un organe convertisseur d'adresse (25, 26) et un organe de stockage (27). Les adresses de terminaux (1 à x) (x=1 à n) connectés à un réseau privé et le numéro du port correspondant à un service fourni par ces terminaux (1 à x) sont enregistrés dans cet organe de stockage (27). Lorsqu'il reçoit un paquet d'un terminal (3) connecté à un réseau mondial (5), le dispositif relais (2) recherche l'adresse d'un terminal (1 à x) pour lequel le même numéro de port sous forme de numéro de port de destination contenu dans le paquet reçu est enregistré. Il convertit l'adresse de destination du paquet reçu en l'adresse que le dispositif relais (2) recherche, et il l'envoie au réseau (4) privé.
PCT/JP2001/001284 2000-02-22 2001-02-22 Terminal, dispositif relais, procede de communication et programme de communication a cet effet WO2001063854A1 (fr)

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JP2000044691A JP3252841B2 (ja) 2000-02-22 2000-02-22 端末装置、中継装置、通信方法及びその通信プログラムを記録した記録媒体
JP2000-44691 2000-02-22

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CN1317874C (zh) * 2003-09-27 2007-05-23 财团法人资讯工业策进会 提供虚拟主机服务快速查询置换的网络地址端口转换网关器与方法

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