WO2001063854A1 - Terminal, relay device, communication method, and communication program therefor - Google Patents

Abstract

A relay device (2) comprises address converting means (25, 26) and storage means (27). In the storage means (27), the addresses of terminals (1 to x) (x=1 to n) connected to a private network and the port number corresponding to a service provided by the terminals (1 to x) are registered. Upon receiving a packet from a terminal (3) connected to a global network (5), the relay device (2) searches for the address of a terminal (1 to x) where the same port number as the destination port number contained in the received packet is registered, converts the destination address of the received packet to the address which the relay device (2) has searched for, and sends it to the private network (4).

Description

 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.

It relates to the method of address conversion when starting. Background art

 In recent years, an interface based on the Internet Protocol 4 (IPv4) technology described in “Internet Protocol—DARPA Internet Protocol Prospectocol RFC 791” has been developed. The spread of the net is remarkable. This is not only due to the expansion of existing leased lines and subscriber telephones, which were the targets of Internet diffusion, and the ISDN market, but also to the “Wi reless Appli ca ti on Protocol Architect ur al Ove rv i ew, WAP Arch itecture Ver. on. 30—Apr—1988 ”and the mobile communication market, including the emergence of systems using WAP (Wireless Application Policy). Has also been targeted. To connect a terminal device to the Internet and perform data communication, an IP address for identifying the terminal device on the Internet is required. The IP address of the Internet, which is a wide area, has a 32-bit address space as a global address, is divided into 8-bit units, displays four numbers in decimal notation, and connects them with dot marks.

The 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. Regarding 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.

 In order to solve such problems, in the long term, `` Internet Protocol, Vernetion 6 (I Pv6) Specificati on, R Pv6 (Internet Protocol) described in FC2460J 6) The application of the technology has been decided However, in the current Internet, which has become widespread with IPv4 technology, the practical problem until IPv6 becomes widespread is the solution on IPv4 technology. Is required.

 `` T he IF Ne two rk Add ress Translator '' in RF C 1631 compiled by IETE (Internet Eng eri ng Ta sk Force) as a conventional technology to solve this problem on IP Pv 4 technology (NAT;) ”described in“ N.T.work Add Ress Translator ”, or“ IP Nework Add Ress Translator (NAT) ”in RFC 2663. NAP T (Ne two rk Add ress Port Trans 1 ator) technology described in "Considi de rations".

 Basically, 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. Combined with the use of private addresses, it enables efficient use of IP addresses. Here, 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. An IP address that can be used. IP address “10.XX x”, “172. 16.X.x”, and “192.168.xx.x” as the private address (where x represents any value from “0 to 255”) ) Is assigned. Note that the IP address assigned to the private address is not used as a global address.

Also, "the address systems of the network Na and the network Nb are different" All three conditions shown below must be satisfied.

 The first condition (partial condition 1) is that each of the networks Na and Nb forms part of a certain metanetwork (a collection of networks connected directly or indirectly to each other). Network.

 The second condition (partial condition 2) 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 (partial condition 3) 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. "

 For example, as shown in FIG. 1, 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. χ. に” is It is a subnet of 4 networks 104. Here, 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.

 Also, since the condition 3 does not hold between the network 1101 and the first network 1101, 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. Are different. The address systems do not differ between the third network 101 and the fourth network 104 because Condition 3 does not hold.

 Next, a configuration of a conventional communication system to which the NAPT technology is applied will be described with reference to FIG.

As shown in the figure, 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. On the other hand, 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 terminal device 1110 is provided with the first communication means of TCFZ IP (Transmi- ssion on Control 1 Protocol / Inte rnett Protocol), and is connected to the server program of the server device 1130 using this communication means. One private address (Apt) of the private network 1140 is assigned to an information processing device equipped with a client program that communicates with the server program.

 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.

 In the server device 1130, 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. As a result, 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 storage means 1127 holds the same information as the correspondence management table shown in FIG. FIG. 8 shows an example of the configuration of the correspondence management table. The correspondence management table will be described with reference to FIG. 8 and FIG.

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, and 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 bucket receiving means 1 123 receives the IP packet addressed to the private network 110 sent from the global network 115 and passes the received IP packet to the address translating means 112. The packet transmitting means 1 124 transmits the IP bucket passed from the address converting means 1 126 to the private network 111.

 As shown in FIG. 3, 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. When the bucket is passed from the bucket receiving means 1 121 to the correspondence search means 1 131, 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. Search for an entry that is equal to the source address and source port number pair and whose value in the second socket field is the same as the destination address and destination port number pair of this IP bucket. If a corresponding entry is found by this search, the corresponding search means 1 13 1 converts this IP bucket and the entry identifier stored in the entry identifier field of this entry into bucket conversion means 1 1 3 2 Pass to. If the corresponding entry is not detected by this search, the corresponding search means 113 passes this IP bucket to the registration means 113.

When the bucket conversion means 1 1 3 2 receives the IP bucket and the entry identifier, Each of the source address and the source port number of this IP bucket is set to the value of the IP address and port number indicated in the third socket field of the entry in the correspondence management table identified from this entry identifier. Rewrite, and pass this rewritten IP bucket to the bucket transmitting means 1 1 2 2.

 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

1 Pass the P bucket and the entry identifier to the bucket conversion means 1 1 3 2.

 As shown in FIG. 4, the address conversion means 1 126 comprises a correspondence search means 1 141 and a bucket conversion means 1 142.

 Corresponding search means 1 1 4 1 starts from packet receiving means 1 1 2 3

26 Receive the IP bucket passed to 6. 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.

Upon receiving the IF bucket and the entry identifier, the bucket converting means 1 1 4 2 sets the destination address and the destination port number of the IP bucket to the first entry indicated in the entry of the correspondence management table identified from the entry identifier. Socket Rewrite the value with the IP address and the port number, and pass the rewritten IP bucket to the bucket transmitting means 1 124.

 Next, the operation of the NAPT technique will be described.

 Here, first, 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.

 At this time, 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 IP packet A addressed from the terminal device 1 1 1 0 to the server device 1 1 3 0 is transmitted by the bucket receiving means 1 1 2 1 of the NAFT relay device 1 1 2 0 via the private network 1 1 4 0. The packet is received, and the bucket receiving means 111 passes this IP bucket A to the address translating means 111.

 The IP bucket A passed to the address conversion means 1 125 is received by the correspondence search means 113. When the above-mentioned IP packet A is passed, the correspondence search means 1 1 3 1 determines from the correspondence management table of the storage means 1 127 that the value of the second socket field is the source address of this IP bucket A. The pair with the source port number is equal to “A p—t, P—t” and the value of the third socket field is the pair with the destination address and destination port number of this IP bucket A “A g— r, P-r] At this point, since the above entry does not exist in the correspondence management table, this entry is not detected by the above search.

 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.

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 means 113.

 When the above-mentioned IP bucket A and the above-mentioned entry identifier are passed, 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.

 When the IP packet B is passed, the bucket transmitting means 1 122 sends the IP packet B to the global network 115.

 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 0, 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”. To identify an IP packet between the port “Pr” of a certain device and the port “Ps” of the server device 1 1 30 itself, and to transmit an IP packet in this data communication session, , 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. Set.

Thereafter, 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.

 Further, 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. When the above-mentioned IP packet E is passed, 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".

 In this case, in 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.

 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.

 As described above, in the existing communication system to which the NAPT technology is applied, 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. By translating the IP address and port number of the network side and the IP address and port number of the global network 1150 associated with this communication session into and from each other, IP communication between a device connected to the base network 1140 and a device connected to the global network 1150 is enabled.

 This technology can also be applied to communication systems in which a single global network is connected to multiple private networks using the same private address system. By connecting each private network and the global network with the NAPT relay device, the terminal device connected to each private network and the global network were connected. Communication with the server device can be realized. For this reason, the number of IP addresses assigned to the terminal devices can be increased by increasing the number of bridge networks connected by the NAPT relay device.

In the conventional communication system between a plurality of networks described above, in a configuration in which a plurality of private networks using the same private address system are connected to one global network, To start communication from In this case, first, 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.

 Therefore, in such a 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.

 Similarly, even if a terminal device attempts to start communication with a terminal device connected to a different private network, the terminal device cannot resolve the address of the terminal device with which it communicates. Communication is not possible.

 Therefore, the present invention solves such a problem, and is not limited to a server device connected to a global network, but to a terminal device connected to each of a plurality of networks configured by different address systems. However, 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

 According to the present 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.

 Accordingly, it is assumed that 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. .

Then, when the second terminal device connected to the second network transmits a bucket addressed to a certain service, 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.

 By adopting such a configuration, when communication is performed between the server device or the second terminal device connected to the second network and the first terminal device connected to the first network, Thus, it is possible to start communication from the server device or the second terminal device, and to enable communication between terminal devices connected to networks having different address systems. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a block diagram showing an example of an existing IP network configuration, and FIG. 2 is a block diagram showing an example of an existing system configuration.

 FIG. 3 is a block diagram showing an example of a partial configuration of FIG. 2,

 FIG. 4 is a block diagram showing an example of a partial configuration different from FIG. 3 in 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, and 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. 23 is a block diagram showing the configuration of the first embodiment according to the present invention, and FIG. 24 is a diagram showing one configuration of a table of storage means used in the embodiment of FIG. Yes,

 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

 The present invention will be described in more detail with reference to the accompanying drawings.

 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 according to the first embodiment 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 terminal device l_x (x = l, n) and the relay device 2 are connected via the private network 4, and the relay device 2 and the terminal The terminal device 3 is connected via a global network 5.

 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.

 In addition, each of the private network 4 and the global network 5 is to be applied as a network simply different from each other without being limited to a private or global network. Since each of them can correspond to each other, description will be made using such names for convenience of explanation.

 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. Via the private network 4, 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. Is done. 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.

 Next, the configuration of the first embodiment of the present invention will be described with reference to FIG. 5, FIG. 6, FIG. 7, and FIG.

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.

 Further, the terminal device 3 has an address resolving means. When 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〇MAIN NAME S one IMPLEMENTAT I ON AND S PEC IF Γ CAT I ON" in RFC 1035. I have.

As shown in the figure, 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. As shown in FIG. 6, the address conversion means 25 includes correspondence search means 251, packet conversion means 252, and registration means 253.

 As shown in FIG. 7, 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.

 Here, with reference to FIG. 8, 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.

 As shown in the figure, 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.

 In the processing terminal registration table 271, the system builder determines in advance the terminal device 1-X that processes the service provided to the terminal device 3, and specifies the address of the terminal device that processes this service in the address field, A port number corresponding to this service is set in each of the port number fields, and the set entry is stored. For example, if the terminal device 1 _ 1 that provides the FTP service to the terminal device 3 is determined, the processing terminal registration table 2 71 includes the address “A 1-1” of the terminal device 1-1, A set with a port number “2 0” corresponding to the FTP service is set and stored. In addition, the correspondence management table 272 has an entry including an entry identifier field, a first socket field, a second socket field, and a third socket field. In the entry identifier field, the value of the second entry identifier for uniquely identifying each entry in the correspondence management table 271, in the relay device 2, is stored. The first socket field consists of a pair of a private network 4 address and a port number. The second socket field and the third socket field are the IP address and port number of the global network 5, respectively. Consists of ·

Returning to FIG. 6, the address conversion means 25 will be described with reference to FIG. The correspondence search means 25 1 receives the local bucket passed from the bucket receiving means 21 to the address conversion means 25. When the local bucket is passed from the bucket receiving means 21, the correspondence search means 25 1 reads the value of the first socket field from the correspondence management table 27 2 of the storage means 27 when this local bucket is passed. A search is made for an entry whose value is equal to the pair of the source address and the source port number of the packet and whose value of the second socket field is equal to the pair of the destination address and the destination port number of this portal.

 When this entry is detected by this search, the corresponding search means 25 1 converts the corresponding mouthpiece bucket and the second entry identifier stored in the entry identifier field of the entry into bucket conversion means 25 2 Pass to. If the corresponding entry is not detected by this search, the correspondence search means 25 1 passes this local bucket to the registration means 25 3.

 When the local bucket and the second entry identifier are passed, 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. Then, the registering means 253 sets the second entry identifier as the value of the entry identifier field, and sets the pair of the corresponding port—the source address and the source port number of the bucket, and the destination address and the destination port number. Each pair is the value of the first socket field and the value of the second socket field. Next, the registering means 25 3 creates an entry in which the pair of the IP address of the global network 5 in the relay device 2 and the selected port number is set as the value of the socket field of 3, and stores this entry in the storage means 2. 7 is stored in the correspondence management table 2 7 2. Then, the registration means 2553 passes the local bucket and the second entry identifier to the bucket conversion means 2552.

Referring now also to FIG. 5 to FIG. 7, _c corresponding retrieval section 2 6 1 explaining the address converting unit 2 6 passed to the address conversion unit 2 6 packet receiving means 2 3 Received IF packet. When the correspondence search means 26 1 receives the IP bucket from the packet reception means 23, the value of the second socket field is read from the correspondence management table 27 2 of the storage means 27 by this IP bucket. A search is made for an entry that is equal to the pair of the source address and the source port number of the packet and the value of the third socket field is equal to the pair of the destination address and the destination port number of this IP packet.

 If a corresponding entry is found by this search, the corresponding search means 26 1 converts the IP bucket and the second entry identifier stored in the entry identifier field of this entry into bucket conversion means 26 2 Pass to. If the corresponding entry is not detected by this search, the correspondence search means 261 passes the IP bucket to the registration search means 263.

 When the IP bucket and the second entry identifier are passed, the bucket converting means 262 converts the IP bucket to a local bucket of the private network 4. The bucket converting means 262 converts the destination address and destination port number of the local bucket to the IP address of the first socket in the entry of the correspondence management table identified from the corresponding second entry identifier. The value is rewritten to the value of the packet number, and the rewritten mouth bucket is passed to the bucket transmitting means 24. The registration search means 263 refers to the processing terminal registration table when the IP bucket is passed, and searches for an entry having the value of the destination port number of this IP bucket as the value of the port number field.

 If no corresponding entry is detected from the processing terminal registration table 271 by this search, the registration search means 263 discards the IP bucket and ends the processing.

 When the search finds a corresponding entry from the processing terminal registration table 271, the registration search means 263 determines the first entry identifier stored in the entry identifier field of this entry and this IP bucket. Hand over to the registration means 2 64.

The registration means 264, when passed the first entry identifier and the IP bucket, stores the address file entered in the processing terminal registration table 271 of the storage means 27 identified by the first entry identifier. Reads the address stored in the field and the port number stored in the port number field, and identifies the unused second entry. Create a child and use the second entry identifier in parentheses as the value of the entry identifier field.

 The registration means 264 sets the pair of the address and the port number as the value of the first socket field, and sets the pair of the source address and the source port number of the IP bucket as the second socket field. In addition, an entry is created in which the set of the destination address and the destination port number of the IP bucket is set as the value of the third socket field, and this entry is stored in the correspondence management table 272 of the storage means 27. . Then, the registration means 264 passes the IP bucket and the second entry identifier to the bucket conversion means 262.

 Also, the address inquiry response solution means 28 shown in FIG. 5 receives the IP bucket having the address resolution inquiry message sent from the global network 5 through the bucket reception means 23, and In response to the resolution inquiry message, if the name of the terminal device queried in this address resolution inquiry message is the name of the terminal device 1 1X connected via the private network 4, response to this address resolution inquiry message To create an address resolution response message having the IP address of the global network 5 assigned to the relay device 2 と し て 2—2 ”as a response message, form the created address resolution response message into an IP packet, and transmit the packet. It is sent to the source of the address resolution inquiry message via means 22.

 Here, the structures of the IP bucket and the local bucket for the oral network used in the present embodiment will be described with reference to FIGS. 9A to 9D, together with FIG. Note that the structure of each bucket shown in FIGS. 9A to 9D is schematically represented by extracting only fields related to the present invention.

First, the structure of a data IP bucket including user data and the like will be described with reference to FIG. 9A. The IP bucket used in the global network 5 includes a source address, a destination address, a source port number, a destination port number, and various control information or user data. An IF packet consists of an IP header, a transport header, and a data part. The transport header can be a TCP header; UDP headers or other transport protocol headers can be used, but which transport protocol header is used is the IP header. Da Of the protocol identifier field. In an IP packet, the source address and the destination address are included in the IP header, and the source port number and the destination port number are included in the transport header. Various control information or user data is included in the data area.

 As shown in Figures 9B and 9C, the IP bucket for the address resolution inquiry message contains the name of the querying terminal, and the IP bucket for the address resolution response message is the address to which it responds. Contains the address of the terminal with the name included in the solution inquiry message. The configuration of the IP bucket for each message when address resolution is realized by the above DNS is shown in the figure.

 Both the IP packet for the address resolution inquiry message and the IP bucket for the address resolution response message have an IP header and a transport header like the IP packet for data, but the data part in the IP bucket for data is a DNS message. Is different. The difference between the IP packet for data and the IP packet for other messages is that in the IP packet for address resolution inquiry message and the IP packet for address resolution request message, either the source port number or the destination port number is DNS. The value that represents the service is “5 3”.

 A data IP bucket is identified by a source port number and a destination port number other than the value 53. Further, the IP bucket for the address resolution inquiry message and the IP bucket for the address resolution response message are identified by the value of the query / response flag in the DNS message. For example, if the value of the inquiry / response flag is “0”, it can be set for an address resolution inquiry message, and if the value is “1”, it can be set for an address resolution response message.

 The name of the terminal device to be queried for address resolution is stored in the name field in the DNS message of the IP packet for the address resolution inquiry message, and the address of the terminal device having the queried name is the DNS message of the IP packet for the address resolution response message. It is stored in the address field in the page.

Each time the terminal device 3 creates an IP packet for an address resolution inquiry message, the terminal device 3 generates an identifier that can be uniquely identified in the terminal device 3, and the identifier in the DNS message included in the created IP packet for the address resolution inquiry message. Store the generated identifier in the field. Relay device 2 receives the address resolution inquiry message When creating an IP packet for an address resolution response message that responds to the IP packet for the message, retrieves the identifier stored in the identifier field in the DNS message of the IP packet for the address resolution inquiry message and resolves this address. This identifier is stored in the identifier field in the DNS message of the IP bucket for the response message. As a result, the terminal device 3 refers to the value of the identifier field included in the DNS message of the received IP inquiry response message IP packet, and thereby responds to the address inquiry response message IP bucket address. The IP bucket for the inquiry request message can be identified. The packet used in the private network 4 includes a source address, a destination address, a source port number, a destination port number, and various control information or user data. If the private network 4 is a network configured by IP, it can be configured as shown in FIG. 9A, similarly to the IP packet of the global network 5. The structure of the mouth packet used in the private network 4 cannot be uniquely expressed because it depends on the type of protocol technology used in the private network 4.For example, as shown in Figure 9D Can be expressed in

 Although not explicitly shown in the drawing, the terminal device 1x, the relay device 2, and the terminal device 3 each receive all the messages, and the message included in the message type field of each received message. There is provided a message distribution means for identifying the message type from the type information and passing the message type to a means for processing the corresponding message type. For example, the relay device 2 receives two types of messages from the global network 5, an IP packet for data and a packet for an address resolution inquiry message, which are included in the bucket receiving means 23 of the relay device 2. Received by the message distribution means. If the received message is an IP packet for data, the message distribution means passes the IP packet to the bucket receiving means 23, and if the received IP packet is an IP packet for an address resolution inquiry message, and if the received IP packet is an IP packet, the IP packet is used for the address resolution inquiry message. The IP bucket is passed to the address inquiry response means 28.

 Next, the operation of the first embodiment according to the present invention will be described with reference to FIG. 10 and FIG. 5 to FIG.

The data communication executed in the first embodiment of the present invention is a data communication There are two types: the case where the terminal device 11 X starts the session and the case where the terminal device 3 starts the session.

 Since the terminal device 1 -X starts a data communication session in the same manner as the existing technology, the NAPT technology, the description of the operation is omitted, and here, the terminal device 3 starts the data communication session. The operation in the case of performing will be described.

 In the private network 4, the terminal device that processes the service corresponding to the port number “P 1” is defined as the terminal device 11 -X, and the address “Α 1-χ” is set in the processing terminal registration table in the relay device. In a state where the correspondence with the port number “P1” is recorded, the terminal device 3 is connected to the port number “P1” of the terminal device 1X from the port of the port number “P2”. The case where the data communication is started will be described.

 When the terminal device 3 starts data communication with the terminal device 1-X, first, address resolution is performed from the name of the terminal device 1-X. This is started by the terminal device 3 transmitting an IP packet for an address resolution inquiry message including the name of the terminal device 1-X as a resolution target device name to the gateway network 5 (step S1). The IP address packet for the address resolution inquiry message is received by the packet receiving means 23 of the relay device 2, and is distributed to the address inquiry response means 28. Since the device inquired in the packet for the address resolution inquiry message is the terminal device 1-X, the address inquiry response means 28 receives the IP address in the global network 5 recorded in the correspondence management table 272. "2-2" is created in the address resolution response message bucket as a response to this inquiry, and is passed to the bucket transmitting means 22. This IP bucket is transmitted by the bucket transmitting means 22 to the terminal device 3 via the global network 5 (step S 2).

The IP packet for the address resolution response message is received by the terminal device 3, and the terminal device 3 determines the destination IP address of the IP bucket addressed to the terminal device 1-X from the content of the received IP packet for the address resolution response message. Address ΓΑ 2—2 ”. Next, the terminal device 3 generates a data IP bucket including data addressed to the terminal device 1-x, and transmits the data IP bucket to the global network 5 (step S3). Therefore, this data IP bucket has the destination address ΓΑ2-2 ”, the source address“ A2-1 ”, the destination port number“ P 1 ”, and the source port number“ F 2 ”. . The above data IP bucket is received by the bucket receiving means 23, and the bucket Stage 23 passes this data IP bucket to address conversion means 26.

 The IP bucket passed to the address conversion means 26 is received by the correspondence search means 26 1. When the above-mentioned IP bucket is passed, the correspondence search means 261 sets the value of the second socket field and the value of the third socket field from this correspondence management table 272 of the storage means 27 to this IP packet, respectively. With the same value as the pair [A 2-1, P 2] of the source address and source port number of this IP packet and the pair [A 2-2, P 1] of the destination address and destination port number of this IP bucket. Search for an entry.

 At this time, the data communication between the port of the terminal device 3 with the port number “P 2” and the port of the terminal device 1-x with the port number “P 1” has not been performed in the past, and the correspondence management table Since this entry does not exist in 272, this search does not find this entry.

 Since the corresponding search means 2 6 1 did not find this entry in this search,

1 Pass the P packet to the registration and retrieval means 26 3.

 When the IP bucket is passed, the registration search means 2663 receives the processing bucket registration table.

Referring to 271, search for an entry having the destination port number value "P1" of this IP bucket as the value of the port number field.

 In this case, as described above, there is an entry of the preset address “A 1−x” and the port number “P 1”, and this entry is detected by searching.

 Since the registration search means 263 detects this entry in this search, it passes the first entry identifier stored in the entry identifier field of this entry and this IP bucket to the registration means 264.

 Upon receiving the first entry identifier and the IP bucket, the registration means 264 receives the entry of the processing terminal registration table 271 in the storage means 27 identified by the first entry identifier. Read the address stored in the address field and the port number stored in the port number field, and generate an unused second entry identifier.

The registration means 264 sets this second entry identifier as the value of the entry identifier field, and sets the pair [A l-x, PI] of this address and this port number in the first socket field. And the pair [A2-1, P2] of the source address and source port number of this IP bucket as the value of the second socket field, and the value of this IP bucket An entry is created in which the pair [A 2-2, P 1] of the destination address and the destination port number is used as the value of the third socket field, and this entry is stored in the corresponding management table 27 of the storage means 27. 2 and memorize as shown. Then, the registration means 264 passes the IP bucket and the second entry identifier to the bucket conversion means 262.

 When the above-mentioned IP bucket and the above-mentioned second entry identifier are passed, the bucket converting means 2 62 converts this IP bucket into a private bucket of the private network 4 and the destination address of this local bucket. The destination port number and the value of the IP address and port number indicated in the first socket field of the entry in the correspondence management table 272 of the storage means 27 respectively identified from the second entry identifier [A l_x, PI], and passes the rewritten oral packet to the packet transmitting means 24.

 When the bucket is passed, the bucket transmitting means 24 sends the local packet to the private network 4, and the local bucket is received by the terminal device 1-X (step S4).

 Thereafter, the IP packet destined for the port number “P 1” of the terminal device 1 -X transmitted from the terminal device 3 to the global network 5 includes the destination address “A 2 _ 2” and the source address ΓΑ 2— 1 , A destination port number “P 1”, and a source port number “P 2”. This IP bucket is similarly received by the bucket receiving means 23 of the relay device 2, and this IP bucket is passed to the correspondence search means 26 1 by the bucket receiving means 23, but is stored in the correspondence management table of the storage means 27. 272 indicates that the value of the second socket field is equal to the pair [P 2-1, P 2] of the source address and the source port number of this IP bucket, and the value of the third socket field Already exists, an entry equal to the pair [P2-2, P1] of the destination address and the destination port number of this IP bucket already exists. Therefore, the correspondence search means 2661 searches the correspondence management table for this entry. Is detected, the IP packet and the second entry identifier of this entry are passed to the bucket conversion means 262, and the IP packet is transmitted by the packet conversion means 262 to the port number "P" of the terminal device 1-X. Ply addressed to "1" The packet is converted into a local packet of the private network 4, and this local bucket is transmitted to the terminal device 11 -X via the private network 4 by the bucket transmitting means 24.

+ Similarly, from step S4 onward, the port number “P1” The packet addressed to the port number “P 2” of the terminal device 3 sent to the private network 4 from the client 3 is a destination address “A 2−1”, a source address “A 1−x”, and a destination port It has a number “P 2” and a source port number “P 1”. This oral packet passes through the packet receiving means 21, the address translating means 25, and the packet transmitting means 22 in the relay device 2, and passes through the destination address ΓΑ 2-1 ”, the source address ΓΑ 2-2”, and the destination Converted to an IP packet having port number "P2" and source port number "P1". The converted IP bucket is transmitted to the terminal device 3 via the global network 5.

 As described above, when relaying an IP packet addressed to the private network from the global network, the relay device processes the port number registered in advance and the IP packet addressed to the port number in a private network. By referring to the correspondence of the addresses of the terminal devices connected to the network, the terminal device which is the destination of this IP packet is determined, and this IP packet is converted into a single packet addressed to this terminal device. By converting the bucket in this manner, communication from a global network terminal device that applies a global address system to a private network terminal device that uses a different address system becomes possible.

 In the first embodiment described above, the same is applied to the case where only one terminal device is connected to the global network and the terminal device is connected to the global network. can do.

 Also, in the first embodiment, a terminal device (terminal device 1 1 X) connected to a network different from the global network (private network 4 which is a non-global network) and a global network are connected. The communication with the terminal device (terminal device 3) was explained. However, even in a communication system in which each of a plurality of non-global networks is connected to a network having a different address system via the above-described relay device, each of the non-global networks is connected to an arbitrary non-global network. Communication between arbitrary terminal devices is also realized in the same manner.

 That is, in the communication system shown in FIG. 11, communication between any of the terminal devices 13 1 to 13 n is possible. This is the i-th non-global network 1 2 i

(Where “i” is one of “1, 2,..., N”) from the terminal device (terminal device A) to the non-global network 1 2 j ( Where "j" is "1, When a bucket for starting a communication session is transmitted to a terminal device (terminal device B) connected to any one of “2,..., N” and “j ≠ i”. This is because 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 is equal to the operation with respect to the terminal device 3 in the first embodiment. However, if the transit network 110 is a non-global network, the address system of the transit network 110 is the address system of the i-th non-global network 12 i and the address of the j-th non-global network 12 j It must be different from any of the systems.

 Further, in the first embodiment described above, a case has been described where the terminal device of the other party whose name is known when the terminal device 3 starts data communication is the terminal device 11X. The terminal device 3 may know only the name of the relay device 2 and perform address resolution by designating the name of the relay device 2.

 Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, a terminal device 1a is shown as a representative of the terminal device 11X in the first embodiment shown in FIG. The terminal device 1a includes, in addition to the configuration of the terminal device 1—, a power operation monitoring unit 11, a registration request transmission unit 12, a deletion request transmission unit 13, an operation confirmation response unit 14, and a storage unit 15. Have. Further, the relay device 2a includes a registration request receiving unit 291, a deletion request receiving unit 2992, and an operation check in addition to the configuration of the relay device 2 in the first embodiment shown in FIG. It has request means 293. Note that the configuration of the address translation unit 26 is the same as the configuration of the address translation unit 26 in the first embodiment shown in FIG.

 Also, although the terminal device 3 is not shown in FIG. 12, it is assumed that the terminal device 3 is connected to the global network 5 as shown in FIG. First, in the terminal device 1a, the provided service list is stored in the storage means 15. This provided service list is a list including port numbers corresponding to the services provided by the terminal device 1a to the terminal device 3, and is a list preset by the user of the terminal device 1a. is there.

The power supply operation monitoring means 11 monitors the power supply operation of the terminal device 1 a by the user, notifies the power-on operation to the registration request transmitting means 12 when detecting the power-on operation, and detects the operation of the power supply 0 FF. The power-off is notified to the deletion request transmission means 13. When notified of the power ON, the registration request transmitting means 12 refers to the provided service list of the storage means 15 and a port number list including all the port numbers set in the provided service list and the terminal device. A registration request message including the address of 1a is created, the registration request message is formed in a local bucket, and transmitted to the relay device 2a via the private network 4.

 When notified of the power OFF, the deletion request transmitting means 13 creates a deletion request message including the address of the terminal device 1a, forms this deletion request message in a local bucket, and sends it through the private network 4. To the relay device 2a.

 The operation confirmation response means 14 receives the operation confirmation request message transmitted from the relay device 2a by a verbal packet via the private network 4, and upon receiving the operation confirmation request message, confirms the operation for this message. A response message is created, the operation confirmation response message is formed in a local bucket, and transmitted to the relay device 2a via the private network 4.

 On the other hand, in the relay device 2a, the registration request receiving means 291 receives the registration request message transmitted from the terminal device 1a via the private network 4 in a local bucket, and receives the registration request message. Upon receipt, it generates an unused first entry identifier. The registration request receiving means 291, the value of the entry identifier field is the first entry identifier, the value of the address field is the address included in the registration request message, and the value of the port number field is the value of the registration request. An entry which is a list of port numbers included in the message is created, and this entry is stored in the processing terminal registration table of the storage means 27. The registration request receiving means 291 further notifies the operation check requesting means 293 of the activation of the terminal device corresponding to this address. The deletion request receiving means 292 receives the deletion request message transmitted from the terminal device 1a via the private network 4 in a single packet, and upon receiving the deletion request message, the storage means 27 All entries whose address field value is equal to the address included in this deletion request message are deleted from the processing terminal registration table of the processing terminal, and the terminal corresponding to this address is sent to the operation confirmation request means 2 93. Notifies the end of the device.

The operation check request means 293 creates an operation check request message, and sends the operation check request message to the terminal device 1a via the private network 4. It waits for reception of an operation confirmation response message transmitted from the terminal device 1a in response to this message. After that, if the operation confirmation response message is successfully received, the operation confirmation requesting unit 293 confirms that the terminal device 1a is operating. Further, if the operation confirmation request message fails to be received thereafter, the operation confirmation requesting means 293 considers that the terminal device 1a has stopped operating, and determines from the processing terminal registration table of the storage means 27. , Delete all entries whose address field value is equal to the address of the terminal device 1a.

 The operation check requesting means 293 starts the timer immediately after transmitting the corresponding operation check request message, and, when the timer expires, as a method of judging the reception failure of the operation check response message. For example, a method of receiving failure can be used. Further, the operation check requesting means 2 93 creates and sends the operation check request message to the terminal device 1a from the start of the terminal device 1a to the end of the terminal device 1a. Or, repeat until reception of the operation confirmation response message issued from the terminal device 1a fails.

 Next, the operation of the second embodiment according to the present invention will be described with reference to FIGS. 13 and 14 and FIG. 12.

 When the user of the terminal device 1a turns on the power of the terminal device 1a that has been stopped (step S11), 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 registration request message transmitted to the relay device 2a is received by the registration request receiving means 291. The registration request receiving means 2911 generates an unused first entry identifier, and, based on the port number list and the address included in the registration request message, sets the value of the entry identifier field to the first entry identifier. An entry whose identifier is the address, the value of the address field is this address, and the value of the port number field is this port number list, and this entry is registered in the processing terminal of the storage means 27. Store it in a table. Further, the registration request receiving means 291 notifies the operation check requesting means 293 of the activation of the terminal device 1a.

 At this point, 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.

 When notified of the activation of the terminal device 1a, the operation confirmation requesting means 293 starts a confirmation operation for the terminal device 1a (step S13). That is, the operation check requesting means 293 creates an operation check request message in a low-level packet, and transmits it to the terminal device 1a via the private network 4 (step S14).

 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 response message is received by the operation confirmation requesting means 2 93. The operation confirmation requesting means 293 confirms that the terminal device 1a is operating by receiving the operation confirmation response message (step S16).

 Thereafter, the operation check requesting unit 293 continues to check that the terminal device 1a is operating by periodically executing the above steps S14 to S16.

 Thereafter, when the user of the terminal device 1a turns off the power of the terminal device 1a (step S17), the power operation monitoring means 11 detects the operation of turning off the power, and the power supply 〇 FF To the deletion request transmission means 13.

 The deletion request transmitting means 13 creates a deletion request message including the address of the terminal device 1a, and transmits the deletion request message to the relay device 2a via the private network 4 (step S18).

 The deletion request message transmitted to the relay device 2a is received by the deletion request receiving means 292, and the deletion request receiving means 2922 reads the value of the 7 address field from the processing terminal registration table of the storage device 27. Deletes all the entries equal to the address included in the deletion request message, and notifies the operation confirmation requesting means 293 of the termination of the terminal device 1a.

When notified of the termination of the terminal device 1a, 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).

 In addition, the operation confirmation request means 293 waits for the reception of the operation confirmation response message which is a response to the operation confirmation request message immediately after the operation confirmation request message is transmitted during the execution of the confirmation operation to the terminal device 1a. When the normal operation of the terminal device 1a stops due to the malfunction or abnormal stop of the control system of the terminal device 1a, the relay device 2a detects the stop of the operation of the terminal device 1a. Used to That is, as shown in FIG. 14, in the confirmation operation by the operation confirmation request means 2 93 performed after the normal operation of the terminal device 1 a is stopped (step S 31), The operation confirmation request means 293 transmits an operation confirmation request message (step S32) and starts a timer (step S33). However, 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. In this state, 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).

 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.

 As described above, in the second embodiment, 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.

In the second embodiment, when the terminal device 1a is turned on, the relay device 2a is notified of a set of port numbers constituting the provided service list stored in the storage unit 15, and Each port number of the set of port numbers is stored in the processing terminal registration table of the storage means 27a. This is because when the terminal device 1a operates, the user provides the service list stored in the storage means 15. The contents of the service, and the service list changed at that time The relay device 2a is notified of the set of port numbers that make up the port number, and the value of the address field stored in the processing terminal registration table of the storage unit 27a, ie, the storage unit 27a, is changed to the value of the terminal device 1a. It is also possible to delete all the entries which are addresses, and to store each port number of this port number set in the processing terminal registration table of the storage means 27a.

 Further, in the second embodiment, the terminal device 1a or the terminal device 3 connected to the private network 4 and the global network 5 has been described as a single case. The same can be applied to a case where a plurality of terminal devices 1a or terminal devices 3 are connected to each network 5.

 In the second embodiment, the global network is connected to a terminal device (terminal device 1a) connected to a network different from the global network (private network 4 which is a non-global network). The communication with the connected terminal device (terminal device 3) has been described. However, even in a communication system in which a plurality of non-global networks are connected to networks having different address systems via the above-described relay device, the communication between any terminal devices connected to any non-global network is also possible. Communication is similarly realized.

 That is, in the communication system shown in FIG. 11, communication between any of the terminal devices 13 1 to 13 n is possible. This is because the terminal device (terminal device A) connected to the ith non-global network 1 2 i (where “i” is one of “1, 2,..., N”) A terminal device connected to the j-th non-global network 1 2 j (where “j” is any of “1, 2, ···· n” and “j ≠ i”) ( When transmitting a bucket for starting a communication session to the terminal device B), 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. However, if the transit network 110 is a non-global network, 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.

In the second embodiment, when the terminal device 3 starts data communication, the terminal device 3 The terminal device 1a was described as the terminal device of the other party.In this case, the terminal device 3 knows only the name of the relay device 2a, and specifies the address of the relay device 2a to address. A solution may be made.

 Next, a third embodiment of the present invention will be described with reference to FIG. 15, FIG. 16, and FIG.

 Referring to FIG. 15, in a third embodiment of the present invention, 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.

 Further, although the terminal device 3 is not shown in FIG. 15, it is assumed that the terminal device 3 is connected to the global network 5 as shown in FIG. Referring to FIG. 16, the configuration of the address translation unit 26 b includes a destination selection unit 2 65 in addition to the configuration of the address translation device 26 in the first embodiment shown in FIG. Different in that.

 Further, as shown in FIG. 17, 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. Similarly, the storage device 15b of the terminal device 1b stores the processing capability information of the terminal device 1b, and 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 is information relating to the processing capability of b. 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 processing terminal registration table 27 1 b stored in the storage means 27 b has the configuration of the fields constituting the entry according to the first embodiment and the second embodiment. In addition, a processing capability information field for storing the processing capability information of the terminal device 1b is provided. The address of the terminal device 1b, the port number corresponding to the service provided by the terminal device 1b, and the The difference is that the management of processing capacity information is managed.

When notified of the power ON from the power operation monitoring means 11, the capacity information transmitting means 16 reads the processing capacity information of the terminal device 1b stored in the storage means 15b, and performs this processing. A capability notification message including the capability information and the address of the terminal device 1b is created, and the capability notification message is transmitted to the relay device 2b.

 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.

 As a method of selecting one terminal device from the processing capability information of a plurality of terminal devices, there is a method of selecting a terminal device having the highest processing capability.

 Next, the operation of the third embodiment according to the present invention will be described with reference to FIG. 18 and FIGS. 15 to 17.

 When the user of the terminal device 1b turns on the power of the terminal device 1b which is stopped (step S41), 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.

 At the same time, in the terminal device 1b, the power operation monitoring means 11 also notifies the power information ON means 16 of the power ON information. When notified 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.

 Thereafter, when 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. Similarly to the operation in the embodiment, 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.

If this entry is not found by this search, as in the operation in the above-described first embodiment, 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.

 For example, in the contents of the processing terminal registration table shown in FIG. 17, the destination port number of this IP packet is “10000”, and the notified first entry identifier is “1”. And “2”, the CPU processing capacity “10” of the terminal device 11 corresponding to the value “1” of the entry identifier field is equal to the CPU processing capability “10” of the terminal device 12 corresponding to the value “2” of the entry identifier field. Better than CPU processing power “3”. For this reason, the destination selection means 265 selects the terminal device 111, and passes the first entry identifier "1" and this IP bucket to the registration means 264.

 After passing the above-mentioned entry identifier and the above-mentioned IP bucket to the registering means 2 64, the processing from transmitting the oral packet to the terminal device 1 b is the same as the operation in the above-described first embodiment. Since they are the same, the description of the subsequent operation is omitted.

 The entry of the terminal device 1b stored in the processing terminal registration table 27 1b of the storage means 27b is stored when the power of the terminal device 1b is turned off or for some reason, when the relay device 2b is When it becomes impossible to communicate normally with 1b, it is deleted by the deletion request receiving means 292 or the operation confirmation requesting means 293, similarly to the operation in the above-described second embodiment.

 As described above, when the relay device 2b receives an IP packet for starting data communication from the global network 5, a plurality of terminal devices providing services corresponding to a port number equal to the destination port number of this IP packet are received. Even if the terminal device is registered in the relay device 2b, the destination selecting means 265 selects one terminal device based on the processing capability information of the plurality of terminal devices, so that the request can be made in this IP bucket. The most suitable terminal device can be selected from the terminal devices that provide the required service.

Also, the processing capability information of the terminal device 1b is stored in the storage device 15b of the terminal device 1b, and the capability information transmitting device 16 is provided with the processing capability information 16 each time the power of the terminal device 1b is turned on. The information is notified to the relay device 2b, and the capability information receiving means 294 registers the processing capability information in the processing terminal registration table 271b of the storage means 27b. Also terminal device 1 When the power of b is turned off, or when normal communication with the relay device 2 b cannot be performed for some reason, the deletion request receiving means 2992 or the operation confirmation request means 2993 is registered as a processing terminal. By deleting the entry related to the terminal device 1b from the table, when the terminal device 1b is not operating, or when the relay device 2b cannot communicate with the terminal device 1b, 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.

 Also in the third embodiment, the case where only one terminal device 1b or three terminal devices 3 are connected to the private network 4 and the global network 5, respectively, has been described. The same can be applied to a case where there are a plurality of terminal devices 1b or terminal devices 3 connected to the global network 5 and the same.

 In the third embodiment, a global network is connected to a terminal device (terminal device 1 b) connected to a network different from the global network (private network 4, which is a non-global network). The communication with the connected terminal device (terminal device 3) has been described. However, even in a communication system in which each of the plurality of non-global networks is connected to a network having a different address system via the above-described relay device, any terminal device connected to any non-global network can be used. Is also realized in the same manner.

That is, in the communication system shown in FIG. 11, communication between any of the terminal devices 13 1 to 13 n is possible. This is because the terminal device (terminal device A) connected to the i-th non-global network 1 2 i (where “i” is one of “1, 2,. Terminal device (terminal device B) connected to the non-global network 1 2 j (where “j” is one of “1, 2,..., N” and “j ≠ i”) ), A packet for starting a communication session is transmitted to the i-th relay device 11 i and the operation of the terminal device B with respect to the j-th relay device 11 j. This is because the operation is the same as that for the terminal device 3 in the embodiment. However, when the transit network 110 is a non-global network, the address system of the transit network 110 is the i-th non-global network 12 i and the j-th non-global network. Network 1 2 j Must be different.

 Further, in the third embodiment, a case has been described where the terminal device 3 is the terminal device 1 b as the partner terminal device that knows the name when starting the data communication, but at this time, the terminal device 3 The address resolution may be performed by knowing only the name of the relay device 2b and specifying the name of the relay device 2b.

 Next, a fourth embodiment of the present invention will be described with reference to FIGS. 19 to 22.

 In the first embodiment described above, it is assumed that the port number system in the private network 4 and the port number system in the global network 5 are the same. On the other hand, in the fourth embodiment, 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 configuration of the fourth embodiment is the same as that of the first embodiment described above. The difference is that the storage means 27 c has a port table 273 c and uses this table. In addition, the address conversion means 25c and the address conversion means 26c have different internal structures and different functions.

 First, the configuration of the processing terminal registration table 271c, the correspondence management table 272c, and the port table 273c, which are tables provided in the storage means 27c, will be described with reference to FIG.

As shown in FIG. 22, 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. However, 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.

 FIG. 20 shows the configuration of the address conversion means 25c in the fourth embodiment. As shown in the figure, the address conversion means 25c includes a correspondence search means 251c, a bucket conversion means 252c, and a registration means 2553c. Elements having the same names as those constituting the address conversion means 25 in the first embodiment described above, and “c” codes are added to the respective number codes. The connection of the components is the same as in the first embodiment.

 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. When 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.

 If this entry is not detected by this search, the correspondence search means 25 1 c discards this local packet and ends the processing.

When this entry is detected by this search, 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.

 If this entry is found from the correspondence management table 27 2 c by this search, the correspondence search means 25 1 c uses this portal and the second entry stored in the entry identifier field of this entry. The ID and the identifier are passed to the bucket conversion means 25 2 c. If this entry is not detected by this search, the correspondence search means 25 1 c passes this packet to the registration means 25 3 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.

 When the registration packet is passed, 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.

Next, 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. As shown in the figure, 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.

 Upon receiving the IP bucket and the second entry identifier, the bucket converting means 2626c stores the source port number of this IP bucket in the port table 273c of the storage means 27c. The entry in the port number field of 2 is searched for, and the value of the first port number field in the detected entry of the port table 273c is read out.

 Then, 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.

 Upon receiving the IP packet, the registration retrieving means 263c searches the port table 273c for an entry having the destination port number of the IP bucket as the value of the second port number field.

If this entry is not detected from the port tape 2273c by this search, the registration search means 263c discards this IP packet and ends the processing. When this entry is detected from the port table 2 73 c by this search, 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.

 If this entry is not detected from the processing terminal registration table 271c by this search, the registration search means 263c discards the IP bucket and ends the processing.

 If this entry is detected from the processing terminal registration table 27 1 c by this search, 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.

 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. Further, 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.

 Further, 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.

Next, an operation in the above-described fourth embodiment will be described. There are two types of data communication executed in the fourth embodiment: a case where the terminal device 1c starts a communication session and a case where the terminal device 3 starts. In any case, the correspondence between the port number of the private network 4 and the port number of the global network 5 corresponding to the service used in the communication session to be started is registered in the port table 273c in advance. Suppose you have

 First, an operation when the terminal device 11X starts a communication session will be described. Here, first, the operation when the terminal device 11 X starts a communication session for using the service provided by the terminal device 3 in order to use the service provided by the terminal device 3 will be described. Is assumed to be “P 4”, and the port number in the global network 5 is assumed to be “P 2”. Therefore, in order to indicate this correspondence, the value of the first port number field is “P 4” in the port table 273 c and the value of the second port number field is “ P2 "is registered. It is also assumed that terminal device 1-X uses the port with port number "P1".

 The terminal device 11X transmits the first local bucket (called local packet A) to use the above service. In this oral packet A, the destination address is ΓΑ2—1 ”, the destination port number is“ P4 ”, the source address is“ A1x ”, and the source port number is“ P1 ”. Becomes

 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.

 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.

Then, the correspondence search means 25 1 c determines from the correspondence management table 27 2 c of the storage means 27 c that the value of the first socket field is the source address of this local bucket A. And the value of the second socket field equal to the pair [A 1—x, P 1] and the destination number of the local bucket A and the port detected in the port table 273 c. Search for an entry whose value in the second port number field in the entry in the entry table 2 7.3 c is equal to the pair [A 2-1, P 2].

 At this point in time, this entry does not exist in the correspondence management table 272c, so this entry is not found by this search.

 Therefore, the correspondence search means 25 1 c passes this local bucket A to the registration means 25 3 c.

 When the registration means 25 3 c is passed the packet A, 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”).

 Then, the registering means 253 c sets the generated second entry identifier as the value of the entry identifier field, and sets the pair [Al of the source address and the source port number of the oral packet A. —X, PI] is the value of the first socket field, and the pair [A 2 _] of the destination address of this low bucket A and the value of the second port number field of the port entry found by this search l, P 2] are the values of the second socket field, and the pair [A 2-2, P 5] of the IP address of the network 5 of the relay device 2 c and the selected port number is the third socket. An entry as a value of the field is created, and this entry is stored in the correspondence management table 272c of the storage means 27c. The result is shown in the figure.

Further, 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. When the above-mentioned local bucket A and the above-mentioned second entry identifier are passed, the bucket converting means 25 2 c converts this packet A into an IP bucket, and The source address and the source port number of the bucket are respectively defined as the IP address ΓΑ 2-2 shown in the third socket field in the entry of the correspondence management table 272 c identified from the second entry identifier. Rewrite with the port number "P5".

 The bucket conversion unit 25 2 c further writes the destination address and the destination port number of this IP bucket with the IP address ΓΑ 2-1 ”shown in the second socket field of this entry and the port number“ P 2 And pass the rewritten IF bucket (called IP bucket B) to the bucket transmitting means 22. At this time, the IP bucket B has a destination address “A 2-1”, a destination port number “P 2”, a source address ΓΑ2-2—and a source port number It will be “P 5”. The IP bucket B passed to the bucket transmitting means 22 is transmitted to the terminal device 3 via the global network 5. The destination address of IP bucket B is ΓΑ2—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 ΓΑ2—. 1 ”and the source port number is“ P 2 ”.

 Thereafter, when 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.

That is, the correspondence search means 25 1 c determines from the correspondence management table 27 2 c of the storage means 27 c that the value of the first socket field indicates the source address and the transmission address of this The port table that is equal to the source port number pair [A l-x, P 1] and the value of the second socket field is detected in the search of the destination address and port table of this packet C. Finds an entry that is equal to the pair [A 2-1, P 2] with the value of the second port number field in that entry. Then, the correspondence search means 25 1 c executes the identification of this portal C and the entry of this entry. The second entry identifier stored in the child field is passed directly to the bucket conversion means 252c without passing through the registration means 2553c.

 The subsequent processing is performed in the same manner as in the case of the local bucket A. That is, this local bucket C has the same source address ΓΑ 2-2 ”, source port number“ P 5 ”and destination address ΓΑ 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.

 As described above, 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 ΓΑ 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.

 At this time, as described above, since the entry registered at the time of the local packet A processing already exists in the correspondence management table 272, and this entry corresponds to the entry to be searched, 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.

When the above-mentioned IP bucket E and the second entry identifier are passed, 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. 2 Rewrite the IP address “A 1—x” and port number “P 1” of the first socket in the entry of c with the values of the source port number of the local packet and the port number “P 4 ”and pass the rewritten oral packet (referred to as oral packet F) to the packet transmitting means 24.

 When the bucket F is passed, 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.

 Next, an operation when the terminal device 3 starts a communication session will be described. Here, first, the operation when the terminal device 3 starts a communication session for using the service provided by the terminal device 1—X in order to use the service provided by the terminal device 1—X will be described. 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”.

 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.

 Next, the terminal device 3 sends out the IP bucket A. In the IP bucket A, the destination address is “A2-2”, the destination port number is “P5”, the source address is “A2-1”, and the source port number is “ P 2 ”.

The IP packet A is received by the packet receiving means 23 of the relay device 2c via the global network 5. The bucket receiving means 2 3 sends this IP bucket A Hand over to dress conversion means 2 6 c.

 The IP bucket A passed to the address conversion means 26c is received by the correspondence search means 261c. When the above-mentioned IP bucket A is passed, 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].

 At this point, since the above entry does not yet exist in the correspondence management table 272c, this entry is not detected by this search.

 Since this entry was not detected in this search, the corresponding search means 2631c passes this IP bucket A to 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.

 In this case, as described above, the entry in which the value of the first port number field is "P1" and the value of the second port number field is "P5" is registered in the port table 273c. So this entry is detected.

 As a result of this search, this entry was detected from the port table 273c, so 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.

 Also in this case, as described above, 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.

 Since this entry was found from the processing terminal registration table 27 1 c by this search, 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.

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. As a result, the illustrated correspondence management table 272c is completed.

 Further, 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.

 When the above-mentioned IP bucket A and the above-mentioned second entry identifier are passed, 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.

Then, the bucket converting means 262c converts the IP bucket A into a local bucket of the private network 4, and converts the destination address and the destination port number of the private bucket into the second bucket, respectively. Rewrite to the IP address “A 1 — x” of the first socket and the port number “P 1” in the entry of the correspondence management table 2 7 2 c identified from the entry identifier, and further transmit this local packet. Rewrite the original port number with “P4” read above, and rewrite the local bucket (Called a local packet B) to 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 ΓΑ2—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 “Α”. 1—χ ”and the source port number is“ P 1 ”.

 Thereafter, 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.

 That is, this time, the correspondence search means 26 1 c reads the value of the second socket field and the value of the third socket field from the correspondence management table of the storage means 27, respectively, in this IF bucket C. A value equal to the pair [A 2-1, P 2] of the source address and the source port number of this IP packet and the pair [A 2-2, P 5] of the destination address and the destination port number of this IP bucket C Is detected. Then, the correspondence detecting means 261c associates the IP bucket C with the second entry identifier stored in the entry identifier field of this entry by using the registered searching means 263c and the registering means 264. Pass it directly to the packet conversion means 262c without going through.

 The subsequent processing is performed in the same manner as in the case of the IP bucket A. That is, 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.

In addition, the terminal device 1 after processing the IP bucket A and the local bucket B described above. As 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”. And 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. When the local bucket E is passed, 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.

 In this case, 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. Further, from the correspondence management table 272 of the storage means 27c, 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. In this case, 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. .

When the local bucket E and the second entry identifier are passed, 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 ΓΑ 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.

 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.

 In the fourth embodiment, the case where only one terminal device 3 is connected to the global network 5 has been described, but the same applies to the case where there are a plurality of terminal devices 3 connected to the global network 5. can do.

 In the fourth embodiment, a terminal device (terminal device 11X) connected to a network different from the global network (private network 4 which is a non-global network) is connected to a global device. The communication with the terminal device (terminal device 3) connected to the network was explained. However, even in a communication system in which a plurality of non-global networks are connected to networks having different address systems via the above-described relay device, any terminal connected to any non-global network Communication between the devices is similarly realized.

 That is, in the communication system shown in FIG. 11, communication between any of the terminal devices 13 1 to 13 n is possible. This is because the terminal device (terminal device A) connected to the i-th non-global network 1 2 i (where “i” is one of “1, 2, ' Terminal device (terminal device B) connected to the non-global network 1 2 j (where “; U is one of“ 1, 2, 1, n ”and“ j ≠ i ”) ), When the bucket for starting the communication session is transmitted, 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 is the same as that of the first embodiment. This is because the operation becomes the same as that for the terminal device 3. However, if the transit network 110 is a non-global network, the address system of the transit network 110 is composed of 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 1 2 j addressing systems.

Further, in the fourth embodiment, a case has been described where the terminal device 3 is a terminal device 11X as a partner terminal device that knows the name when the terminal device 3 starts data communication. At this time, the terminal device 3 may know only the name of the relay device 2c, and may perform address resolution by designating the name of the relay device 2c.

 Further, in the fourth embodiment, the storage means 27 c has a port table 273 c as compared with the configuration of FIG. 5 which is the first embodiment of the present invention, Although the embodiment in which the operation functions of the conversion means 25c and the address conversion means 26c are different has been described, the configuration shown in FIG. 12 or FIG. 15 which is the second and third embodiments described above will be described. Also, the storage means 27a and b are provided with port tables 2773a and b, and the internal operation functions of the address conversion means 25a and b and the address conversion means 26a and b are similarly provided. And port search table 2 7 3 a using address conversion means 25 a and b corresponding search means 25 1 a and address conversion means 26 a and b registration search means 26 3 a and b This can be applied by searching the processing terminal registration table 27 1 a and b after searching for b.

 Next, an embodiment of a communication program according to the present invention will be described. In the present embodiment, the terminal device and the relay device according to the present invention in the above-described first, second, third or fourth embodiment are not particularly shown, but are not shown in the data processing device and the storage device. It has a device and further has a communication program. This recording medium may be a magnetic disk, a semiconductor memory, a CD-ROM, or another recording medium. In the following description, only the main number signs of the constituent elements are described in the same names, and additional signs such as alphabets are omitted.

 The communication program for controlling the relay device 2 is read from the storage medium into the storage device of the relay device 2, and the storage means 27 stores the processing terminal registration table 271 and the correspondence management table 272. In the communication program corresponding to the third embodiment, a processing terminal registration table 271 including capability information is further stored. In the communication program corresponding to the fourth embodiment, a port table 2 7 3 is stored.

Then, the communication program causes the data processing device to generate packet receiving means 21, 23, packet transmitting means 22, 24, address converting means 25, 26, and address inquiry response means 28. Control its operation. Further, the communication program according to the second embodiment further generates a registration request receiving unit 291, an operation check requesting unit 293, and a deletion request receiving unit 292 in the data processing device. Further, the communication program corresponding to the third embodiment includes a capability information receiving unit 294 in the data processing device. 101284 Further generate and control their operation.

 The data processing device executes the same process as the communication process described in the relay device 2 in the first, second, third, and fourth embodiments under the control of the communication program described above.

 When the communication program for controlling the terminal device 1 corresponds to the second embodiment, the communication program is read from the recording medium into the terminal device 1 and is supplied to the data processing device by the power operation monitoring means 11, the registration request transmitting means 12, the operation, The acknowledgment means 14 and the deletion request transmission means 13 are generated and their operations are controlled. Further, the communication program according to the third embodiment further causes the capability information transmitting means 16 to generate and control the operation thereof. In the communication program corresponding to the second embodiment, a provided service list is stored in the storage unit 15. Further, in the communication program corresponding to the third embodiment, processing capability information is further stored in the storage means 15.

 The data processing device executes the same processing as the communication processing by the terminal device 1 in the second and third embodiments under the control of the communication program.

 【Example】

 Next, a first embodiment of the present invention will be described with reference to FIG. 23 and FIG. Such an example corresponds to the first embodiment described above. Therefore, the following operation procedure will be described with reference to FIG. Components that are not shown in FIGS. 23 and 24 will be described using the reference numerals used in FIGS. 5 to 8 referred to in the first embodiment.

 As shown in FIG. 23, in this embodiment, an Ethernet 4 d is constructed as the private network 4, and a private address managed by the owner is stored in the Ethernet 4 d. The system (192.168.XXX.XXX) is adopted. As the global network 5, an IP network 5d is constructed, and the IP network 5d is an existing Internet adopting a global address system. Also, a mail terminal 1 d-2 such as a personal computer as the terminal device 1, an ISDN router 2 d as a relay device, and a terminal device external user terminal 3 d used by an external user as the terminal device 3. Is provided. The ISDN router 2d is connected to an ISP (Internet Service Provider) network by the ISDN.

Consists of private network 4 and devices connected to this network The Ethernet 4d is a personal home network system consisting of an Ethernet cable wired in the home of the individual and a personal computer connected to this cable directly or via an Ethernet hub. The SOHO (Sma 11 Of Office Home Of), a small business establishment constructed in a similar configuration, can be targeted. Here, an FTP server program that provides FTP (File Transfer Protocol 1) service is installed on this Ethernet 4d, and the name is `` ft p. User—a.isp 1. FTP server 1 d—1 with the address “192.168.0.2” and the address “192.168.0.2”, and a program for sending and receiving e-mail, and the name “P c 1. user— 1. It is assumed that a mail terminal 1d-2 which is isp 1.ne.jp "is connected.

 I The SDN router 2d has the name “user—a. Isp 1.ne.jp”, and “192.168.0.1” as the address on the Ethernet 4d side. It is assumed that “133.1.1.5” is assigned as a global address assigned by the SP. Further, the ISDN router 2d has a storage unit 27d as shown in FIG. 24, and has a storage unit 27d, a wave processing terminal registration table 271d, and a correspondence management table 272d.

 Here, it is assumed that the FTP server 1d-1 provides the FTP service to the external user terminal device 3d. In this case, as shown in FIG. 24, in the processing terminal registration table 271 d of the I SDN router 2 d, the address of the FTP server 1 d-1 and the port number “20” corresponding to the FTP service are It is registered in advance. It is also assumed that no entry exists in the correspondence management table 272d.

At this time, it is assumed that the external user terminal 3d starts data communication for using the FTP service from the port with the port number "1024" to "user-a.ispl.ne.jp". The subsequent step numbers refer to FIG. 10 described above. The external user terminal 3 d creates an address resolution inquiry message from the name “user—a. Isp l. Ne e.jp” and sends this address resolution inquiry message (step S 1). 2d or a network server capable of resolving the address of this ISDN router 2d within the ISP creates an address resolution response message in response to this address resolution inquiry message, and sends this address resolution response message to the outside. Send to user terminal 3d (step S2). At this time, Contains the information that the address of the ISDN router 2 d queried in the address resolution inquiry message is “13.3.1.1.5”.

 When receiving the address resolution response message, the external user terminal 3d sets the destination address to the address "1 3.1.1.1.5" notified by the address resolution response message, and the destination port number is FTP. "2 0" corresponding to the service, the source address is "20.18.12.0.0.1" which is the address of the external user terminal 3d, and the source port number is "1". It creates an IP bucket of "0 2 4" and sends this IP bucket to the ISDN router 2d.

 Upon receiving the above IP bucket, the IS DN router 2d passes the IP bucket from the bucket receiving means 23 to the correspondence search means 261, and the correspondence management table 27 2d stores an entry corresponding to this IP bucket. Since the IP packet does not exist, this IP bucket is passed to the registration and retrieval means 263.

 The registration search means 263 refers to the processing terminal registration table 271 d. Here, in the processing terminal registration table 271 d, the port number field is equal to the destination port number of this IP bucket. Since there is an entry having a value of "0", the entry identifier "1" of this entry and this IP bucket are passed to the registration means 264.

 The registration means 264 uses the contents of the entry in the processing terminal registration table 271 d corresponding to the passed entry identifier and the contents of the passed IP bucket to the correspondence management table 272 d. The correspondence for this IP packet is registered as shown. Thereafter, the IS DN router 2 d refers to the entry of the registered correspondence management table 27 2 d, and refers to the port number “20” of the FTP server 1 d—1 and the port number “2 0” of the external user terminal 3 d. 1 0 2 4 ”is relayed.

 In the first embodiment, an example in which the private network 4 is configured by the Ethernet 4 d has been described. However, the private network 4 is not limited to other communication media and communication protocols such as IEEE 1394 and wireless LAN. May be used. If the connection from the ISD router 2d, which is a relay device, to the IP network 5d, which is a global network, is a dedicated line, the relay device is an IP router having an interface device that accommodates this dedicated line. You may.

Next, a second embodiment of the present invention will be described with reference to FIGS. 25 and 26. I do. This example corresponds to the above-described fourth embodiment. Therefore, components that are not shown in FIGS. 25 and 26 will be described by removing the suffix “c” from the reference numerals used in the fourth embodiment. The following operation procedure is based on FIG. 10 described above.

 As shown in FIG. 25, this embodiment includes a wireless communication network 4e, an IP network 5e, a portable information device 1e, a mobile phone terminal device 2e, and an external user terminal 3e. The wireless communication network 4 e uses the Bluetooth technology described in “B 1 ue to oo th Spe cifi ca ti on ver si on 1.0 A” as the private network 4. It is. In addition, the IP network 5 e is configured as a global network 5 from the existing Internet and a mobile communication network. The portable information device 1e has the same communication function as the slave (s1ave) in the Bluetooth technology as the terminal device 1-X. The mobile phone terminal 2 e has a TCPZIP communication function with the IP network 5 e as the relay device 2, the same communication function as the master in the Bluetooth technology, and a communication function between these protocols. It has a function of relaying communication between the private network 4 and the global network 5. The external user terminal 3 e is used by an external user as the terminal device 3.

 Here, as an example of a portable information device 1 e used as a terminal device 1—X, a camera 1 e— 1, a video camera le— 2 and a notebook PC (Pe r sonal Computer) 1 e— 3 are examples. Suppose that they are assigned Bluetooth addresses 1, 2, and 3, respectively. This notebook PC_3 is equipped with an FTP server program that interprets the FTP protocol and provides the FTP service, and a storage device that stores files, and communicates directly with the mobile phone terminal device 2e using Bluetooth technology. Suppose the device is dedicated to the FTP server.

 The mobile phone terminal device 2e is assigned a name "user-a.op 1.co.jp" for identification from the IP network 5e, and has a global address of 133. 1.1.5 ”is assigned. The port number of the wireless communication network 4e corresponding to the FTP service is "10", and the port number of the IP network 5e is "20".

Therefore, as shown in FIG. 26, the storage means 27 e of the mobile phone terminal device 2 e In the port table 273 e, the correspondence between the port number “10” of the wireless communication network 4 e corresponding to the FTP service and the port number “20” of the IF network 5 e is described. In e, the correspondence between the address “3” of the notebook PC 1 e-3 and the port number “10” of the wireless communication network 4 e corresponding to the FTP service is registered in advance. However, it is assumed that the entry does not yet exist in the correspondence management table 272 e.

 Here, it is assumed that the notebook PC 1 e-3 provides the FTP service to the external user terminal 3 e. At this time, it is assumed that the external user terminal 3e starts data communication for using the FTP service from the port having the port number "1024" to "user-apop 1.co.jp".

 The external user terminal 3 e creates an address resolution inquiry message from the name “user—a.op 1.co.jp” and sends this address resolution inquiry message (step S 1). The device 2e or a network server capable of resolving the address of the mobile phone terminal device 2e in the mobile communication network creates an address resolution response message responding to the address resolution inquiry message, and transmits the address resolution response message. Transmit to external user terminal 3e (step S2). At this time, the address resolution response message contains information indicating that the address of the mobile phone terminal device 2 e queried in the address resolution inquiry message is “133.1.1.5”.

 When the external user terminal 3 e receives the address resolution response message, the destination address is the address “133. 1.1.5” notified in the address resolution response message, and the destination port number is set to the FTP service. The corresponding IP bucket is “20”, the source address is “208.192.0.1”, which is the address of the external user terminal 3 e, and the source port number is “1024”. Create and send this IP packet to the mobile phone terminal 2e.

 Upon receiving the IP bucket, the mobile phone terminal device 2 e passes the IP bucket from the bucket receiving means 23 to the correspondence search means 261, and the correspondence management table 27 2 e stores the entry corresponding to this IP packet at this time. Since the IP packet does not exist, the IP bucket is passed to the registration / retrieval means 263.

The registration search means 263 searches the port table 273 e for this IP bucket. Knows that the port number of the wireless communication network 4 e corresponding to the destination port number “2 0” of the server is “1 0”. Further, by searching the processing terminal registration table 27 1 e, the port number “1 Since the entry in which the address of the radio communication network 4e providing the service of “0” is registered 1e—X is detected, the registration search means 266 3 uses the IP bucket and the entry identifier “1” of this entry. Is passed to the registration means 2 6 4.

 The registration means 264 uses the correspondence management table 272 e from the contents of the entry of the processing terminal registration table 271 e corresponding to the passed entry identifier "1" and the contents of the passed IP bucket. The correspondence regarding the IP bucket is registered as shown in FIG. Thereafter, the mobile phone terminal device 2 e refers to the entry of the registered correspondence management table 272 e and communicates with the FTP server program of the notebook PC 1 e-3 by Bluetooth and the external user terminal. 3 Relay TCP / IP communication with port number "1 0 2 4" of e.

 As described above, the present invention has the following effects.

 The first effect is that data communication can be started from a terminal device connected to the global network to a terminal device connected to the private network. The reason is that the relay device that connects the global network and the private network manages the correspondence between the address of the terminal device connected to the private network and the port number corresponding to the service provided by this terminal device. Then, referring to this correspondence, the destination of the local bucket for starting the data communication from the terminal device connected to the global network is converted and relayed. As a result, even when this relay device associates one global address with a plurality of terminal devices connected to the private network, the destination port number included in the IP packet that starts data communication is also obtained. This is because the terminal device that transfers this IP bucket can be identified by the value of.

 The second effect is that the address of the terminal device on the other end can be resolved between terminal devices connected to different private networks. This enables data communication between terminal devices connected to different private networks. The reason is the same as the reason for the first effect.

The third effect is that an IP bucket that starts data communication is relayed only when a terminal device connected to a private network is operating. This allows It is possible to prevent IP packets that do not have a receiving terminal device from being relayed unnecessarily. The reason is that a terminal device connected to the private network registers a service to be provided to the relay device when it starts up, and deletes the registered service when it ends.

 The fourth effect is that when a terminal device connected to the private network cannot operate normally due to some abnormality, an IP bucket for starting data communication is not relayed. As a result, it is possible to prevent the receiving terminal device from unnecessarily relaying the IP bucket that is not operating normally. The reason is that the relay equipment periodically checks whether it is operating normally with respect to the terminal equipment connected to the private network in which the service is registered.

 The fifth effect is that, in particular, as shown in the first embodiment and the second embodiment, in a situation where one user manages the private network, the private network is connected to the private network. If there are multiple terminals that can provide the same service, even if the terminal that is currently providing this service stops operating, another request for this service will be automatically sent to another terminal. This is to enable communication with terminal devices that can provide this service. The reason is that, in the private network, the port number resource is shared between the terminal devices connected to the private network, and for the reasons of the third and fourth effects described above. As described above, when the terminal device becomes inactive, the registration of the service provided by this terminal device is automatically deleted, so that even if the terminal device currently providing this service ends operation, This is because the relay device can relay the subsequent request for this service to another terminal device that has registered the provision of this service. Industrial applicability

 As described above, the terminal device, the relay device, the communication method, and the communication program according to the present invention are suitable for data communication between a plurality of networks configured by different address systems.

That is, the communication device and the communication method according to the present invention can start data communication from a terminal device connected to the global network to a terminal device connected to the private network. Also, for different private networks This is because the address of the partner terminal device can be resolved between the connected terminal devices, thereby enabling data communication between the terminal devices connected to different private networks.

 Further, an IP bucket for starting data communication is relayed only when the terminal device connected to the private network is operating. As a result, it is possible to prevent an IP bucket in which a receiving terminal device does not exist from being relayed needlessly.

Claims

The scope of the claims

1. The first network and a second network having a different addressing system from the first network are connected via a relay device,

 The relay device includes at least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device. Memorized in the first management table,

 A second terminal device connected to the second network transmits a bucket addressed to a certain service,

 Upon receiving the bucket, the relay device searches the first management table for a first entry having the same service identifier as the destination service identifier included in the bucket, and detects the destination address of the bucket. To the address of the first terminal device in the first entry, and transmits the packet to the first terminal device.

A communication method, comprising:

 2. The first network and a second network having a different address system from the first network are connected via a relay device,

 The relay device,

 A first management table stores at least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device. Remember,

 A first socket, which is a set of an address of a first terminal device connected to the first network and a service identifier of the first terminal device, and a first socket connected to the second network; A second socket, which is a set of an address of the second terminal device and a service identifier of the second terminal device, an address of the relay device in the second network, and a second address of the relay device. A second management table for storing at least one second entry including a third socket which is a pair with a service identifier in the network is prepared,

A second terminal connected to the second network transmits a packet addressed to a service, The relay device,

 When a bucket is received from the second network, the value of the second socket and the value of the third socket are respectively set from the second management table as a set of a source address and a source service identifier of this packet. And the same second entry as each of the destination address and destination service identifier pair,

 If the second entry is not detected, the first management table is searched for a first entry having the same service identifier as the destination service identifier included in the packet,

 A set of the address of the first terminal device in the detected first entry and the service identifier of the first entry is defined as a first socket, and the set of the source address of the packet and the source service identifier is defined as the first socket. A second socket including a set of a destination address and a destination service identifier of the bucket as a third socket, and a second socket including the first socket, the second socket, and the third socket. The second entry in the second management table, and

 A communication method, comprising rewriting a destination address of the bucket to an address of a first terminal device in the detected first entry, and transmitting the bucket to the first terminal device.

 3. The communication method according to claim 2, wherein the relay device, when the second entry is detected, changes the destination address of the bucket to the address of the first socket in the detected second entry. And transmitting the bucket to the first terminal device.

 4. The first network is connected to a second network having a different address system and service identifier system from the first network via a relay device.

 The relay device,

 A first management table includes at least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device. Remember,

A first socket, which is a set of an address of a first terminal device connected to the first network and a service identifier of the first terminal device, and the second network; A second socket, which is a set of an address of a second terminal device connected to the network and a service identifier of the second terminal device, an address of the relay device in the second network, and the relay A second management table for storing at least one second entry including a third socket which is a pair with the service identifier of the second network in the device is prepared,

 For the same service, at least one third entry including a service identifier used in the first network and the service identifier used in the second network is stored in a third management table,

 The second terminal device connected to the second network transmits a bucket addressed to a certain service,

 When receiving the bucket from the second network, the relay device stores the value of the second socket and the value of the third socket from the second management table as the source address and the source of the packet. Searching for the same second entry as each of the service identifier pair and the destination address and destination service identifier pair,

 When the second entry is detected, the third management table is searched for a third entry having the same service identifier value as that of the bucket as a service identifier used in the second network. Rewrite the source service identifier of the packet with the service identifier of the first network in the detected third entry, and replace the destination address and the destination service identifier of the bucket with the detected Rewriting the address and service identifier of the first socket in the second entry, and transmitting the bucket to the first terminal device;

If the second entry is not detected, the third management table is searched for a third entry having the same service identifier value as that used in the second network as the destination service identifier of the bucket; and The first management table is searched with the service identifier of the first network in the detected third entry, and the address of the first terminal device in the detected first entry and the address of this entry are searched. A set of a service identifier is a first socket, a set of a source address of the bucket and a source service identifier is a second socket, and a set of a destination address and a destination service identifier of the bucket is a A third socket, and a second entry including the first socket, the second socket, and the third socket is referred to as the third socket. Memorized in 2 management table,

 Selecting an unused service identifier in the first network, using the selected service identifier as a service identifier of the first network, and defining a source service identifier of the bucket as a service identifier of the second network; Create the third entry to be stored in the third management table,

 Rewriting the destination address and destination service identifier of the packet to the address and service identifier of the first terminal device in the detected first entry, and rewriting the source service identifier to the selected service identifier, Send the bucket to the first terminal device

A communication method, comprising:

 5. The first network and the second network having different address systems and service identifier systems from the first network are connected via a relay device,

 The relay device,

 At least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device is stored in a first management table. Aside

 A first socket, which is a set of an address of a first terminal connected to the first network and a service identifier of the first terminal, and a second socket connected to the second network; A second socket, which is a set of an address of the terminal device and a service identifier of the second terminal device, an address of the relay device in the second network, and the second socket of the relay device. A second management table for storing at least one second entry including a third socket which is a pair with the service identifier of the network of

 At least one third entry including the service identifier used in the first network and the service identifier used in the second network for the same service is recorded in a third management template. Every

 A first terminal device connected to the first network transmits a bucket addressed to a certain service,

The relay device is a server for the first network in the third management table. Searching the third entry for which the value of the service identifier is the destination service identifier of the bucket;

 When the third entry is detected, the values of the first socket and the second socket are respectively determined from the second management table by using the source address and the source service identifier of this bucket. Searching for a second entry that is the same as each of the set and the destination address of the parentheses bucket and the service identifier of the second network in the searched third entry;

 When the second entry is detected, the destination service identifier of the bucket is rewritten to the service identifier of the detected second socket, and the source address and the source service identifier of the bucket are replaced. The bucket is rewritten to the address of the third socket and the service identifier, and the bucket is transmitted to the second terminal device. If the second entry is not detected, the source address and the source service of the packet are transmitted. The pair of the identifier and the first socket is used as the first socket, and the pair of the destination address of the packet and the service identifier of the second network of the third entry detected by searching the third management table. A second socket is selected, and an unused service identifier in the second network is selected, and the address of the second network of the repeater and the second selected network address are selected. A pair with the service identifier of the network is a third socket, and a second entry including the first socket, the second socket, and the third socket is the second socket. The third service identifier in the management table, the selected service identifier being the service identifier of the second network, and the source service identifier of the bucket being the service identifier of the first network. Create an entry and store it in the third management table,

 The destination service identifier of the bucket is rewritten to the service identifier of the second socket, and the source address and the source service identifier are rewritten to the address and service identifier of the third socket. And transmitting the packet to the terminal device.

 6. The communication method according to claim 1, 2, 3, or 4,

 The first terminal device connected to the first network,

Notifying the relay device of a registration request including the address of the first terminal device and the service identifier of the service provided by the first terminal device, The relay device,

 A communication method comprising: receiving a pre-recording request; and storing a first entry including an address of a terminal device and a service identifier included in the registration request in the first management table.

 7. The communication method according to claim 1, 2, 3, 4, or 6,

 The first terminal device connected to the first network,

 Notify the relay device of a deletion request including the address of the terminal device,

 The relay device,

 Upon receiving the deletion request, the first management table is searched for a first entry having a terminal device address included in the deletion request, and the first entry detected by this search is deleted. A communication method, comprising:

 8. The communication method according to claim 1, 2, 3, 4, 6, or 7,

 The relay device transmits an operation confirmation request message to a first terminal device connected to the first network,

 Upon receiving the operation confirmation request message, the first terminal device transmits an operation confirmation response message to the relay device,

 The relay device confirms the operation of the first terminal device by receiving the operation confirmation response message, and, when confirming the operation failure of the first terminal device, determines the operation from the first management table. A communication method comprising: searching for a first entry having an address of a first terminal device that has transmitted a confirmation request message; and deleting the first entry detected by the search.

 9. The communication method according to claim 1, 2, 3, 4, 6, 7, or 8,

 A communication method, characterized in that at least one first entry in the first management table includes processing capability information of a first terminal device connected to the first network.

10. The communication method according to claim 1, 2, 3, 4, 6, 7, 8, or 9, wherein the first terminal device connected to the first network includes an address of the terminal device. The relay device notifies the relay device of a capability notification message including processing capability information.When the relay device receives the capability notification message, the relay device relates to the first terminal device in the first management table. In one entry, the capability notification message A communication method characterized by storing a processing capability report included in a message.

 11. In the communication method according to claim 9 or 10,

 The relay device, when a plurality of first entries having the same service identifier as the destination service identifier included in the bucket are detected, determine the first entry based on the processing capability information. A communication method comprising:

 1 2. The first network and the first network are relay devices for connecting second networks having different address systems,

 A first management table storing at least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device; With

 For a bucket addressed to a certain service from the second terminal device connected to the second network, the first management table has the same service identifier as the destination service identifier included in the bucket from the first management table. A first search means for searching the first entry;

 Means for rewriting the destination address of the packet to the address of the first terminal device in the first entry detected by the first search means;

And a relay device.

 1 3. The first network and the first network are relay devices for connecting a second network having a different addressing system,

 A first management unit that stores at least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device; Tables and

 A first socket, which is a set of an address of a first terminal connected to the first network and a service identifier of the first terminal, and a first socket connected to the second network; A second socket, which is a set of an address of the second terminal device and a service identifier of the second terminal device, an address of the second network of the relay device, and a second address of the relay device. A second management table for storing at least one second entry including a third socket paired with a service identifier of the network;

A second terminal connected to the second network addressed to a certain service; When receiving the bucket, the value of the second socket and the value of the third socket from the second management table are respectively set as a pair of a source address and a source service identifier of the bucket, Second search means for searching for the same second entry as each of the pair of the destination address and the destination service identifier;

 In a case where the second entry is not detected by the search by the second search means, for the bucket, a second identifier having the same service identifier as the destination service identifier included in the bucket from the first management table. A first search means for searching one entry;

 A set of an address of the first terminal device in the first entry detected by the first search means and a service identifier of the first entry is defined as a first socket, and a source of the bucket is defined as a first socket. The pair of the address and the source service identifier is a second socket, the pair of the destination address of the bucket and the destination service identifier is a third socket, and the first socket and the second socket are used. First registration means for registering a second entry including the third socket and the third socket in the second management table; and a destination address of the packet detected by the first search means. Means for rewriting the address of the first terminal device in the first entry;

And a relay device.

 14. The relay device according to claim 13, wherein, when a second entry is detected by the search by the second search means, the destination address of the packet is changed to the first address in the detected second entry. A rewriting means for rewriting the address of the socket.

 1 5. The first network is a relay device for connecting the first network with a second network having a different address system and service identifier system, and is connected to the first network. A first management table storing at least one first entry including an address of a first terminal device and a service identifier of a service provided by the first terminal device;

A first socket that is a set of an address of a first terminal device connected to the first network and a service identifier of the first terminal device; and a second socket connected to the second network. A second socket, which is a set of an address of the terminal device and a service identifier of the second terminal device, and the second network in the relay device; A second management table storing at least one second entry including a third socket, which is a set of the address of the relay device and the service identifier of the second network in the relay device;

 A third management table for storing at least one third entry including a service identifier used in the first network and the service identifier used in the second network for the same service;

 When a bucket addressed to a certain service is received from the second terminal device connected to the second network, the value of the second socket and the value of the third socket are read from the second management table, respectively. Second search means for searching for the same second entry as the pair of the source address and the source service identifier of the bucket and the pair of the destination address and the destination service identifier;

 If the second entry is detected by the second search means, the value of the service identifier used in the second network is changed from the third management table to the source service of the bucket. A third search means for searching for a third entry that is the same as the identifier;

 The source service identifier of the packet is rewritten to the service identifier of the first network in the third entry detected by the third search means, and the destination address and the destination service identifier of the bucket are replaced. Means for rewriting the address of the first socket and the service identifier in the detected second entry; and if the second entry is not detected by the second search means, the third management data. A fourth search means for searching a third entry from the table for which the value of the service identifier used in the second network is the same as the destination service identifier of the bucket;

First search means for searching the first management table using a service identifier of a first network in a third entry detected by the fourth search means; and the first search A set of the first terminal device address of the first entry detected by the means and the service identifier of this entry is defined as a first socket, and the source address, source service identifier, and Is a second socket, a set of the destination address and the destination service identifier of the bucket is a third socket, and the first socket, the second socket, and the third socket are The second method that contains Registering an entry in the second management table, further selecting an unused service identifier in the first network, using the selected service identifier as a service identifier of the first network, and Registering means for creating the third entry using the service identifier of the data source as the service identifier of the second network, and registering the third entry in the third management table;

 Means for rewriting the destination address and destination service identifier of the packet to the address and service identifier of the first terminal device in the detected first entry, and rewriting the source service identifier to the selected service identifier. A relay device comprising:

 1 6. The first network is a relay device for connecting the first network to a second network having a different address system and service identifier system, and is connected to the first network. A first management table storing at least one first entry including an address of a first terminal device and a service identifier of a service provided by the first terminal device;

 A first socket, which is a set of an address of a first terminal device connected to the first network and a service identifier of the first terminal device, and a second socket connected to the second network; A second socket, which is a set of the address of the terminal device and the service identifier of the second terminal device, the address of the second network in the relay device, and the second network in the relay device. A second management table storing at least one second entry including a third socket paired with the service identifier; and

 A third management table storing at least one third entry including a service identifier used in the first network and a service identifier used in the second network for the same service;

 When a bucket addressed to a certain service is received from the first terminal device connected to the first network, the value of the service identifier related to the first network in the third management table is set to the destination of the bucket. Third search means for searching for the third entry that is a service identifier;

When the third entry is detected by the third search means, the value of each of the first socket and the second socket is stored in the bucket from the second management table. The same as the pair of the source address of the packet and the source service identifier, and the pair of the destination address of the bucket and the service identifier of the second network of the third entry searched. A second search means for searching the second entry;

 When the second entry is detected by the second search means, the destination service identifier of the bucket is rewritten to the service identifier of the detected second socket, and the source address and source of the packet are rewritten. Means for rewriting a service identifier into an address of the third socket and a service identifier;

 If the second search unit does not detect the second entry, a set of the source address and the source service identifier of the bucket is set as a first socket, and the destination address of the packet and the third address are set as the first socket. A set of the service identifier of the second network of the third entry detected by the search of the management table of the third entry is used as the second socket, and a service identifier unused in the second network is selected. A pair of the address of the second network and the service identifier of the selected second network is a third socket, and the first socket, the second socket, and the third socket are A second entry including the service identifier of the second network as the service identifier of the second network, and registering the bucket in the second management table. Registration means the source service identifier to create the third entry to the service identifier of the first network, and registers the third management table,

 Means for rewriting the destination service identifier of the bucket to the service identifier of the second socket, and rewriting the source address and the source service identifier to the address and service identifier of the third socket; and

And a relay device.

 1 7. The relay device according to claim 12, 13, 13, 14, or 15,

 When receiving a registration request including the address and service identifier of the first terminal device issued from the first terminal device connected to the first network, the first terminal device includes the first terminal device included in the registration request. Means for storing, in the first management table, a first entry including the address of the terminal device and the service identifier,

Upon receiving a deletion request including the address of the first terminal device issued from the first terminal device, the terminal device has the address of the first terminal device included in the deletion request. Means for retrieving the first entry and deleting the detected first entry from the first management table;

A relay device, further comprising:

 1 8. The relay device according to claim 12, 13, 14, 14, 15, or 17, wherein an operation confirmation request message is sent to a first terminal device connected to the first network. Transmitting, and confirming the operation of the first terminal device by receiving an operation confirmation response message from the first terminal device, if the operation of the first terminal device cannot be confirmed, the The method further includes an operation check request unit that searches the first management table for a first entry having the address of the first terminal device that has transmitted the operation check request message, and deletes the detected first entry. Relay characterized by comprising

1 9. The relay device according to claim 12, 13, 13, 14, 15, 17, or 18, wherein the first entry in the first management table includes the first entry in the first network. . Relay device characterized by including processing capability information of connected first terminal device

20. The relay device according to claim 12, 13, 13, 14, 15, 17, or 18, wherein an address of the terminal device is transmitted from a first terminal device connected to the first network. When receiving the capability notification message including the processing capability information and the processing capability information, the processing capability included in the capability notification message is included in the first entry of the first terminal device in the first management table. A relay device, further comprising means for storing information.

 21. In the relay device according to claim 19 or 20, when a plurality of first entries having the same service identifier as a destination service identifier included in the bucket are detected, the processing capability information is included. A relay device, further comprising means for determining one first entry based on the first entry.

 2 2. The first network is connected to a second network having a different address system from the first network via a relay device, and a terminal connected to the first network is connected to the first network. Device

At least one first terminal including an address of a first terminal connected to the first network and a service identifier of a service provided by the first terminal. Means for notifying the relay device having the first management table storing the first entry of a registration request including the address of the terminal device and the service identifier of the service provided by the terminal device. A terminal device comprising:

23. The terminal device according to claim 22, further comprising means for notifying the relay device of a deletion request including the address of the terminal device to the relay device. apparatus.

 2 4. The terminal device according to claim 22 or 23, further comprising: means for transmitting an operation confirmation response message when receiving an operation confirmation request message from the relay device. Terminal device to do.

 2 5. The terminal device according to claim 22, 23, or 24, further comprising means for notifying the relay device of the processing capability information of the terminal device. straight.

 2 6. The first network and the second network having a different address system from the first network are connected via a relay device,

 The first management table of the relay device stores at least one first entry including an address of the terminal device connected to the first network and a service identifier of a service provided by the terminal device. To memorize,

 In the relay device, for a bucket addressed to a certain service from another terminal device connected to the second network, the same service as the destination service identifier contained in the bucket from the first management table is used. A first entry having an identifier is searched for, and the bucket receives the transmitted bucket by rewriting the destination address of the bucket to the address of its own terminal device in the first entry detected by the search. Terminal device.

 2 7. The first network and the first network are communication programs of the relay device connecting the second networks having different address systems,

 A first terminal that stores at least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device. Management templates and

For a bucket destined for a certain service from a second terminal device connected to the second network, a destination service included in the bucket from the first management table. First search means for searching for a first entry having the same service identifier as the service identifier; and

 Conversion means for rewriting the destination address of the packet to the address of the first terminal device in the first entry detected by the first search means;

A communication program that causes the relay device to function.

 2 8. The first network is a communication program of a relay device connecting the second network having a different address system from the first network,

 A first management unit that stores at least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device; Table and

 A first socket, which is a set of an address of a first terminal connected to the first network and a service identifier of the first terminal, and a second socket connected to the second network; A second socket, which is a set of the address of the terminal device and the service identifier of the second terminal device, and the address of the second network in the relay device and the second network in the relay device. A second management table storing at least one second entry including a third socket which is a pair with the service identifier of

 When a bucket addressed to a certain service is received from the second terminal device connected to the second network, the values of the second socket and the third socket are respectively obtained from the second management table. A second search means for searching for the same second entry as each of the pair of the source address and the source service identifier of the bucket, and the pair of the destination address and the destination service identifier;

 If the second entry is not detected by the search by the second search means, the first packet having the same service identifier as the destination service identifier included in the packet from the first management table for the packet. A first search means for searching the entry,

A set of the address of the first terminal device and the service identifier of the first entry in the first entry detected by the first search means is defined as a first socket, and the source of the bucket is The pair of the address and the source service identifier is the second socket, and the pair of the destination address and the destination service identifier of the bucket is the third socket. First registration means for registering a second entry including the first socket, the second socket, and the third socket in the second management table as a socket; and a destination of the bucket. Conversion means for rewriting the address to the address of the first terminal device in the first entry detected by the first search means;

A communication program that causes the relay device to function.

 2 9. In the communication program according to claim 28, when a second entry is detected by the search by the second search means, the destination address of the bucket is determined by the second entry in the detected second entry. A communication program that causes the relay device to function as a means for rewriting an address of a first socket.

 30. The first network is a communication program of a relay device for connecting a second network having a different address system and a different service identifier, and

 A first terminal storing at least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device; Management table,

 A first socket, which is a set of an address of a first terminal connected to the first network and a service identifier of the first terminal, and a second socket connected to the second network; A second socket, which is a set of the address of the terminal device and the service identifier of the second terminal device, the address of the second network of the parenthesis relay device, and the second address of the relay device. A second management table storing at least one second entry including a third socket which is a pair with a service identifier of the network;

 A third management table for storing at least one third entry including a service identifier used in the first network and a service identifier used in the second network for the same service;

When a bucket addressed to a certain service is received from the second terminal device connected to the second network, the values of the second socket and the third socket are respectively read from the second management table. Second search means for searching for the same second entry as the pair of the source address and the source service identifier of the packet and the pair of the destination address and the destination service identifier, respectively; If the second search unit detects the second entry, the value of the service identifier used in the second network is the same as the source service identifier of the bucket from the third management table. A third search means for searching for a third entry;

 The source service identifier of the bucket is rewritten to the service identifier of the first network in the third entry detected by the third search means, and the destination address and the destination service identifier of the bucket are detected. Means for rewriting the address of the first socket and the service identifier in the second entry; and if the second entry is not detected by the second search means, the second entry is retrieved from the third management table. A fourth search means for searching for a third entry in which the value of the service identifier used in the network is the same as the destination service identifier of the packet,

 A first search unit that searches the first management table using a service identifier of a first network in a third entry detected by the fourth search unit; and the first search. A set of the address of the first terminal device of the first entry detected by the means and the service identifier of this entry is used as a first socket, and the source address and the source service of the packet are set. A set of an identifier is a second socket, and a set of a destination address and a destination service identifier of the bucket is a third socket, and the first socket, the second socket, and the third socket are Is registered in the second management table, further selects an unused service identifier in the first network, and stores the selected service identifier in a service of the first network. And an identifier, a source service identifier of the Baketsuto creating the third entry to the service identifier of the second network, and registering means for registering in the third management Te one table, and

 Means for rewriting the destination address and destination service identifier of the bucket to the address and service identifier of the first terminal device in the detected first entry, and rewriting the source service identifier to the selected service identifier. A communication program for causing a relay device to function.

3 1. The first network is a communication program of a relay device that connects the second network with a different address system and a different service identifier from the first network. And

 A first terminal storing at least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device; A management table,

 A first socket, which is a set of an address of a first terminal device connected to the first network and a service identifier of the first terminal device, and a second socket connected to the second network; A second socket, which is a set of the address of the terminal device and the service identifier of the second terminal device, the address of the second network in the parentheses relay device, and the second socket in the relay device. A second management table for storing at least one second entry including a third socket paired with a service identifier of the network of the first embodiment;

 A third management table storing at least one third entry including a service identifier used in the first network and a service identifier used in the second network for the same service;

 When a bucket addressed to a certain service is received from the first terminal device connected to the first network, the value of the service identifier related to the first network in the third management table is changed to the destination service identifier of the bucket. Third search means for searching for the third entry,

 When the third entry is detected by the third search means, the values of the first socket and the second socket are respectively replaced with the source address of the bucket from the second management table. A second entry for searching the same second entry as the combination of the source service identifier and the combination of the destination address of the packet and the service identifier of the second network in the retrieved third entry. When the second entry is detected by the second search means, the destination service identifier of the bucket is rewritten with the detected service identifier of the second socket, and the packet is transmitted. Means for rewriting the source address and the source service identifier to the address and service identifier of the third socket;

If the second search unit does not detect the second entry, a pair of the source address and the source service identifier of the packet is set as a first socket, and the destination address of the packet and the third address are set. Third table found by searching the management table The pair of the service identifier of the second network of the entry is used as the second socket, and a service identifier unused in the second network is selected, and the address of the second network of the relay device and the address of the second network are selected. A set of the selected service identifier of the second network is defined as a third socket, and a second entry including the first socket, the second socket, and the third socket is defined as the second socket. Registered in the management table of the first network, and further, the selected service identifier is used as the service identifier of the second network, and the source service identifier of the bucket is used as the service identifier of the first network. Registration means for creating the third entry and registering it in the third management table; and

 Means for rewriting a destination service identifier of the bucket with a service identifier in the second socket, and rewriting a source address and a source service identifier with an address and a service identifier of the third socket;

A communication program that causes the relay device to function.

3 2. The communication program according to claim 27, 28, 29, or 30, wherein the address of the first terminal device issued from the first terminal device connected to the first network is Upon receiving a registration request including a service identifier, the first management table stores a first entry including an address of a first terminal device and a service identifier included in the registration request. Means to

 Upon receiving a deletion request including the address of the first terminal device issued from the first terminal device, the first terminal device receives the address of the first terminal device included in the deletion request from the first management table. Means for searching the first entry and deleting the first entry found;

A communication program that causes the relay device to function.

3 3. The communication program according to claim 27, 28, 29, 30, or 32, wherein an operation confirmation request message is sent to the first terminal device connected to the first network. Transmitting, confirming the operation of the first terminal device by receiving an operation confirmation response message from the first terminal device, and if the operation of the first terminal device cannot be confirmed, the first An operation confirmation requesting means for searching the first entry having the address of the first terminal device that transmitted the operation confirmation request message from the management table and deleting the detected first entry is provided in the relay device. Characterized by Communication program.

 3 4. The communication program according to claim 27, 28, 29, 30, 32, or 33, wherein the first network in the first entry in the first management table. A communication program comprising processing capability information of a first terminal device connected to a communication terminal.

 3 5. The communication program according to claim 27, 28, 29, 30, 32, 33, or 34, wherein the first terminal device connected to the first network includes: Upon receiving the capability notification message including the address of the terminal device and the processing capability information, the processing capability included in the capability notification message is stored in the first entry of the first terminal device in the first management table. A communication program causing the relay device to function as means for storing information.

 3 6. In the communication program according to claim 34 or 35, when a plurality of first entries having the same service identifier as the destination service identifier included in the bucket are detected, the communication program is based on the processing capability information. A communication program for causing the relay device to function as a means for determining one first entry.

3 7. The first network is connected to a second network having a different address system from the first network via a relay device, and a terminal connected to the first network is connected to the first network. A communication program for the device,

 A first management table storing at least one first entry including an address of a first terminal device connected to the first network and a service identifier of a service provided by the first terminal device; A communication program characterized by causing a terminal device to function as a means for notifying a relay device having a registration request including an address of the terminal device and a service identifier of a service provided by the terminal device.

 38. The communication program according to claim 37, wherein the terminal device has a function of notifying the relay device of a deletion request including the address of the terminal device to the relay device. Communication program.

3 9. The communication program according to claim 37 or claim 38, wherein, when receiving an operation confirmation request message from the relay device, causing the terminal device to function to transmit an operation confirmation response message. Communication program.

40. The communication program according to claim 37, 38, or 39, wherein the terminal device has a function of notifying the relay device of processing capability information of the terminal device. program.

 4 1. The first network is connected to a second network having a different address system from the first network via a relay device, and the terminal device connected to the first network is connected to the first network. Communication program,

 The at least one first entry including the address of the terminal device connected to the first network and the service identifier of the service provided by the terminal device is stored in the first entry of the relay device. Memorized in the management template,

 In the relay device, for a bucket addressed to a service from another terminal device connected to the second network, the same as the destination service identifier included in the bucket from the first management table. A first entry having a service identifier is searched for, and the destination address of the bucket is rewritten to the address of its own terminal device in the first entry detected by the search, and the transmitted bucket is received. A communication program executed by the terminal device.