JPH10276201A - Atm address recognition system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To immediately answer to an inquiry signal by a domain name from a terminal with a necessary ATM address by making a domain name server cooperate with an ATM address management server and returning a response to received ATM address inquiry information to the pertinent terminal. SOLUTION: The terminal equipments 2a-2f transmit extension protocol address inquiry information containing a protocol address when they desire to learn the physical address of the destination terminal. Domain name servers 3a and 3b managing the domain names and the protocol addresses return the responses to the pertinent terminals when they receive inquiry information. ATM address management servers 4a-4b managing the protocol addresses and the ATM addresses are provided with ATM address tables storing the corresponding relation of the protocol addresses and the ATM addresses of the plural terminals. They refer to the ATM address tables and return the ATM address inquiry responses.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an AT in which a domain name server and an address management server are provided.
M (Asynchronous Transfer M)
The present invention relates to a system for knowing the address of a terminal device using a protocol address such as a domain name or an IP (Internet Protocol) address in a network (asynchronous transfer mode).

[0002]

2. Description of the Related Art The Internet standardization organization IE
TF (Internet Engineering T
Ask Force), as one of the Internet protocols, for example, the ASCII publisher “Standard LAN”
Textbook (above) "p. 158, the DNS (Doma
in Name Server) protocol. This protocol provides a service for determining a protocol address such as an IP address from a name (domain name) given to a system or the like on a network. This method is compatible with existing LANs (Local
Area Network), this mechanism eliminates the need for the user to know the protocol address of each system. Furthermore, in the IETF, in order to accommodate the Internet on an ATM network, for example, the Nikkei BP Publishing Center “ATM Internet Working” p. A shown in 99-102
TMARP (ATM Address Resolution)
ion Protocol) system, p. 102-p. 1
07 (Next Hop Reso)
For example, a protocol method for obtaining an ATM address from a protocol address using an ATM address management server, such as a lution protocol, is being determined.

FIG. 22 is a diagram showing an example of a configuration of an ATM communication network for explaining a method of knowing an ATM address from a domain name using the above-described conventional method, and FIG. 23 is a diagram of the conventional method of knowing an address shown in FIG. It is a signal sequence diagram.
In FIG. 22, 1 and 1a to 1f are ATM switching devices, 2 and 2g to 2l are terminal devices accommodated in the ATM network, and 3 and 3c to 3d are connected to the ATM network and manage domain names and protocol addresses. domain·
The name servers 4, 4 and 4a-4b are connected to the ATM network and manage the protocol address and the ATM address. The ATM address management server 5 is connected to the ATM network.
A network management device for managing and controlling the TM network, 6 and 6
a to 6b are logical subnets accommodated on the ATM network.

In FIG. 23, reference numeral 71c denotes a protocol / address inquiry signal transmitted from the transmitting terminal to the domain name server 3a, 71d denotes a protocol / address inquiry signal transferred between the domain name servers, and 72d denotes a domain / address inquiry signal. A protocol address inquiry response signal transmitted between name servers, 72b is a protocol address inquiry response signal sent from the domain name server to the transmitting terminal, and 73a is A from the transmitting terminal.
An ATM address inquiry signal sent to the TM address management server 4a, 73b is an ATM address inquiry signal transferred between the ATM address management servers, and 74a is A
An ATM address inquiry response signal transmitted between the TM address management servers, 74b is an ATM address inquiry response signal sent from the ATM address management server to the transmitting terminal, and 75 is an ATM switching device from the transmitting terminal to the destination terminal via the ATM switching device. A connection setting instruction to be performed, 76 is a ctection setting response from the transmitting terminal to the destination terminal device via the ATM switching device, and 77 is a data transfer from the transmitting terminal to the destination terminal device via the ATM switching device. .

FIG. 24 is a diagram showing a configuration example of a conventional domain name server, FIG. 25 is a diagram showing a configuration example of a domain name table of the name server, and FIG. 26 is a domain name server of the name server. FIG. 3 is a diagram illustrating a configuration example of an address table. In FIG. 24, 100
Is the inter-server communication function of the domain name server, 101
Is a protocol address response function of the domain name server, 102 is a domain name table of the domain name server, and 103 is a domain name server address table of the domain name server.

FIG. 27 is a diagram showing a configuration example of a conventional ATM address management server, FIG. 28 is a diagram showing a configuration example of an ATM address table of the ATM address management server, and FIG. 29 is a diagram of the ATM address management server. FIG. 3 is a diagram showing a configuration example of an ATM address management server address table. 27, reference numeral 104 denotes an inter-server communication function of the ATM address management server, 105 denotes an ATM address response function of the ATM address management server, 106 denotes an ATM address table of the ATM address management server, and 107 denotes ATM address management of the ATM address management server. It is a server address table.

FIG. 30 is a diagram showing a flow until data communication of a conventional terminal device is performed, and FIG. 31 is a diagram showing a protocol address inquiry signal and a response signal for inquiring a destination protocol address from a destination domain name.

An address conversion operation for knowing an ATM address from a domain name such as a host name on an ATM network by a conventional address management method will be described with reference to FIGS. 22 to 31 taking an IP network as an example. For example, an attempt is made to transmit data from the terminal device 2g to the domain name of the terminal device 21. At that time, if the terminal device 2g does not know the IP address of the terminal device 21, the protocol address inquiry signal 7 specifying the domain name of the terminal device 21 as the destination domain name.
1c to the name server 3a. Name server 3a
Receives the protocol address inquiry signal 71c, and refers to the domain name table 102 held by itself to check whether the domain name and the protocol address of the destination terminal device 21 are registered.

If the domain name and protocol address information of the destination terminal device 21 is not registered in the domain name table 102, the name server 3c
Is the domain name server address,
The table 103 is searched to find out 3d as the domain name server to which the inquiry signal should be sent next, and send the protocol address inquiry signal 71d to this domain name server 3d. Domain name server 3
When d receives the protocol address inquiry signal 71d, it refers to the domain name table 102 and checks whether the domain name and protocol address of the destination terminal device 21 are registered. If the protocol address of the terminal device 21 is registered in the domain name table 102, a protocol address inquiry response signal 72a including the protocol address of the terminal device is returned to the domain name server 3c. The domain name server 3c that has received the protocol / address inquiry response signal 72a sends the protocol / address inquiry response signal 72b to the transmitting terminal device 2g, and the terminal device 2g converts the domain name of the terminal device 21 into a protocol address. Can be performed.

[0010] The terminal device 2g at that time is
If the ATM address of the terminal 21 is unknown, an ATM address inquiry signal 73a specifying the IP address of the terminal device 21 as the destination IP address is sent to the ATM address management server 4a. The ATM address management server 4a
When the TM address inquiry signal 73a is received, it checks whether or not the protocol address and the ATM address of the destination terminal device 21 are registered with reference to the ATM address table 106 held therein. If the information on the protocol address and the ATM address of the destination terminal device 2l is not registered in the ATM address table 106, A
The TM address management server 4a stores the ATM
The address management server address table 107 is searched to find out the address of 4b as the ATM address management server to which an inquiry signal is to be sent next, and send the ATM address inquiry instruction signal 7 to this ATM address management server 4b.
3b is sent out. The ATM address management server 4b
When the TM address inquiry signal 73b is received, the A
With reference to the TM address table 106, it is checked whether the protocol address and the ATM address of the destination terminal device 21 are registered. ATM address table 10
If the ATM address of the terminal device 2l is registered in the ATM address management server 4, the address inquiry response signal 74a including the ATM address of the terminal device is sent to the ATM address management server 4.
Return to a. ATM address inquiry response signal 74a
The ATM address management server 4a which has received the message sends an ATM address inquiry response signal 74b to the transmitting terminal 2g, and the terminal 2g receiving this can convert the protocol address of the terminal 21 into an ATM address.

The transmitting terminal 2g, which has completed the conversion from the domain name to the ATM address, sends out a connection setting instruction signal 75 for setting a connection toward the ATM address of the destination terminal 21. After that, the connection setting is completed by receiving the connection setting response signal 76, and the data communication 77 can be performed. The domain name table 102 and the ATM address table 106 held by the domain name server and the ATM address management server 3 are stored in each domain name server and the ATM address management server from the network management device 5 and when the terminal receives the information from the terminal. When setting by an ATM address registration signal,
When transferring an inquiry signal or an inquiry response signal,
In the case of setting by the data included in the inquiry signal and the inquiry response transferred between the name server and the ATM address management server, and directly by each domain name server, AT
There is a case where it is set in the M address management server.

The domain name server 3 and the ATM address management server 4 hold the domain name server address table 103 and the ATM address management server address table 107 from the network management device 5 to each domain name server 3 and the ATM address. When set in the management server 4, the server-to-server communication functions 100 and 104
There are a case where communication is performed between the domain name servers 3 and the ATM address management server 4, and a case where the communication is directly set between the domain name server 3 and the ATM address management server 4. Also, the domain name server address table 103, the ATM address management server address table 107, and the server-to-server communication function 10
0, 104, domain name table 10
2. If the information of the inquiry terminal is not registered in the ATM address table 106, an abnormal response may be returned.

[0013]

Since the conventional method of knowing the ATM address is configured as described above and performing communication, in order to know the protocol address from the domain name and the ATM address from the protocol address, It is necessary to make inquiries to different servers, and the procedure of the terminal is complicated, and there is a problem that it takes a long time to actually start communication. This inconvenience occurs because the existing LAN system, which mainly uses connectionless technology, is brought into the ATM network as it is without considering the nature of the ATM, and is not necessarily the connection-oriented technology of the ATM network. Above is not the optimal method.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a domain name server and an ATM address management server operate in cooperation with each other while maintaining compatibility with the operation of a server. It is an object of the present invention to obtain a device that immediately responds to a required ATM address in response to an inquiry signal based on a domain name from a terminal having an extended function, by providing a server database with ATM address information.

[0015]

An ATM address recognition system according to the present invention comprises an ATM (Asynchronous).
In a system for performing communication between terminals in the os Transfer Mode, when it is desired to know the physical address of the destination terminal, an extended protocol address inquiry information including a protocol address is transmitted, and a terminal device for setting a connection from the response information is provided. A domain name table for storing correspondence between protocol addresses and domain names of a plurality of terminals, an ATM address inquiry mechanism for transmitting ATM address inquiry information upon receiving extended protocol address inquiry information, and receiving a response. A domain name server for returning a response to the extended protocol address inquiry information including the received ATM address inquiry response to the terminal, a protocol address of a plurality of terminals, and an ATM.
An ATM address table is provided for storing the correspondence with the address, and an ATM address management server is provided which, upon receiving the ATM address inquiry information, returns an ATM address inquiry response by referring to the ATM address table.

Furthermore, the domain name table in the domain name server stores the correspondence with the ATM address, transmits ATM address inquiry information to the address management server at a predetermined timing, and receives a reply. The ATM address is stored in the domain name table, and a response to the extended protocol address inquiry information is returned to the terminal by referring to the domain name table.

Further, the predetermined timing is the timing of registering or changing the correspondence between the protocol address of the terminal and the ATM address.

Further, the predetermined timing is a timing of registering or changing the correspondence between the protocol address of the terminal and the domain name.

Still further, the domain name server includes an address management server mechanism having an ATM address table for storing a correspondence between a protocol address and an ATM address of a plurality of terminals. When the inquiry information is received, a response including the ATM address is made.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a block diagram showing an embodiment of an ATM address resolution system according to the present invention.
The system configuration is the same as that of FIG. 14 showing an example of the configuration of the M communication network. 2 and 3 are diagrams showing a configuration example and an operation flow of a domain name server according to the present embodiment, and FIG. 4 is a signal sequence diagram showing an inquiry and connection setting operation in the system of the present system. . FIG. 5 is a diagram showing a configuration example of an extended protocol / address inquiry signal and a response signal in the present embodiment, and FIG. 6 performs a batch inquiry in the present invention. It is a flowchart which shows operation | movement of a terminal device. In FIG. 1, 1 and 1a to 1f are ATM switching devices, 2 and 2a to 2f are terminal devices accommodated in an ATM network, and 3 and 3a to 3b are connected to an ATM network and manage domain names and protocol addresses. Domain name server, 4 and 4a-4b are AT
ATM address management server connected to the M network for managing protocol addresses and ATM addresses, 5 is a network management device connected to the ATM network for managing and controlling the ATM network, and 6 and 6a to 6b are accommodated on the ATM network. Logical subnet.

Next, the operation of address recognition in this embodiment will be described with reference to FIGS. 1 to 6 and FIGS. 27 to 29. In the present embodiment, a batch inquiry is made from the terminal to the physical address of the destination terminal, the corresponding name server also makes an inquiry to the address management server, and the answer is returned to the terminal together with the terminal to reduce the load on the terminal. Save time. The terminal device 2a is, for example, a terminal device 2f
In order to transmit a data packet to the domain name server 3a, an extended protocol address inquiry signal 71a shown in FIG. (Step S32 in FIG. 6... Hereinafter, the description of the steps is omitted). The domain name server 3a which has received the extended address inquiry signal 71a refers to the domain name table 102 held by itself and refers to the terminal device 2 of the destination.
It is determined whether the domain name and the protocol address of f are registered (S12 in FIG. 3).

If the domain name table 102 held by the name server 3a does not register the information of the domain name and the protocol address of the destination terminal device 2f, the name server 3a stores the domain information held by itself. The name server address table 103 is searched to obtain an address of 3b as a domain name server to which an inquiry signal is to be sent next (S16). The domain name server 3a sends an extended protocol address inquiry signal 71b to the domain name server 3b (S17). Extended protocol address inquiry signal 7
The domain name server 3b having received 1b refers to its own domain name table 102,
It is determined whether the domain name and the protocol address of the destination terminal device 2f are registered (S12).

From this, an operation not available in the conventional system is performed. That is, when the protocol address of the terminal device 2f is registered in the domain name table 102, the protocol address of the destination terminal device 2f is recognized, and the protocol address of the destination terminal device 2f is changed in FIG. ATM address inquiry signal 78a including
Is sent to the ATM address management server 4b (S in FIG. 3).
21). The ATM address management server 4b, which has received the ATM address inquiry signal 78a,
With reference to the M address table 106, it is determined whether the protocol address and the ATM address of the destination terminal device 2f are registered. ATM address table 1
When the ATM address of the terminal device 2f is registered in 06, the ATM address inquiry response signal 78b in FIG. 4 including the ATM address of the terminal device is returned to the domain name server 3b.

The domain name server 3b which has received the ATM address inquiry response signal 78b in S22 of FIG.
Sends an extended protocol address inquiry response signal 79a including the protocol address and the ATM address of the destination terminal device shown in FIG. 5B to the domain name server 3a (S23 in FIG. 3). This operation is performed by the ATM address inquiry function 108 of FIG. The domain name server 3a, which has received the extended address inquiry response signal 79a, sends the extended protocol address inquiry response signal 79b to the transmission terminal device 2a, thereby transmitting the protocol address and A of the destination terminal device 2f.
Notify the TM address. The terminal device 2a that has received the extended protocol / address inquiry response signal 79b in S33 of FIG.
It issues a connection setting instruction 75 toward the M address,
Upon receiving the connection setting response signal 76, the connection setting is completed, and the data transfer 77 is executed (S in FIG. 6).
34, S35, S36).

As described above, in the address recognition system according to the present embodiment, the terminal makes an inquiry to the server only once using the extended inquiry information, and the name server transfers the inquiry to the ATM address management server and returns the answer. Is returned to the terminal, so that the source terminal acquires even the ATM address of the destination terminal device,
The time until the start of communication can be reduced.

Embodiment 2 FIG. In the present embodiment, a case will be described in which an ATM address is also stored in the domain server and returned to the terminal. In the first embodiment, the terminal device on the transmitting side sends an extended protocol address inquiry signal, and every time the domain name server receives this, it sends an ATM address inquiry signal to the ATM address management server. If the domain name server, which has received the ATM address inquiry response signal once, holds the ATM address information and responds to the subsequent inquiry signal with the held information, the ATM by the name server can be used.
Inquiry to the address management server every time becomes unnecessary. Further, the AT held by this domain name server
In the present embodiment, the update timing of the M address information is described as the timing at which the ATM address information of the destination terminal is first received from the ATM address management server in response to an inquiry from the terminal. 7 and 8 are diagrams showing a configuration example and an operation flow of a domain name server in the present embodiment, and FIG. 9 is a diagram showing a configuration example of an extended domain name table of the domain name server in the present embodiment. FIG. FIG. 10 is a signal sequence diagram showing a collective inquiry and a connection setting operation in the system according to the present embodiment.

Next, the operation of this embodiment will be described with reference to FIGS. 1, 5 to 10, and 27 to 29.
The terminal device 2a transmits an extended protocol / address inquiry signal 71a (information in FIG. 5A) including an inquiry about the domain name of the terminal device 2f to transmit a data packet to the terminal device 2f, for example.・
It is transmitted to the name server 3a (S32 in FIG. 6). FIG.
The domain name server 3a that has received the extended address inquiry signal 71a refers to the extended domain name table 110 held by itself, and
It is determined whether the domain name and the protocol address of f are registered (S42 in FIG. 8). Name server 3
a in the extended domain name table 110 held by
If the information on the domain name and the protocol address of the destination terminal device 2f is not registered, the name server 3a searches its own domain name server address table 103, and then sends an inquiry signal. An address 3b is obtained as a domain name server to be sent (S46). The domain name server 3a sends an extended protocol address inquiry signal 71b to the domain name server 3b (S47).

Extended protocol address inquiry signal 7
The domain name server 3b that has received 1b refers to the extended domain name table 110 held by itself, and determines whether the domain name and the protocol address of the destination terminal device 2f are registered (S42).
When the protocol address and the ATM address of the terminal device 2f are registered in the extended domain name table 110, the extended protocol address inquiry response signal 79a including the protocol address and the ATM address of the destination terminal device is sent to the domain name server. 3a. When the protocol address of the terminal device 2f is registered but the ATM address is unknown, FIG.
AT including the protocol address of the destination terminal device 2f
An M address inquiry signal 78a is sent to the ATM address management server 4b (S51 in FIG. 8).

The ATM address management server 4b, which has received the ATM address inquiry signal 78a, refers to the ATM address table 106 held by itself and checks whether the protocol address and the ATM address of the destination terminal device 2f are registered. judge. When the ATM address of the terminal device 2f is registered in the ATM address table 106, an ATM address inquiry response signal 78b including the ATM address of the terminal device in FIG. 10 is sent to the domain name server 3b. The domain name server 3 that has received the ATM address inquiry response signal 78b
b indicates the destination terminal device 2 in the extended domain name table.
The ATM address of f is registered (S53 in FIG. 8), and the protocol address and A of the destination terminal device 2f are registered.
An extended protocol address inquiry response signal 79a including the TM address is sent to the domain name server 3a (S54). Extended address inquiry response signal 79a
The domain name server 3a that has received the request sends the extended protocol address inquiry response signal 79b to the transmitting terminal device 2a, thereby notifying the protocol address and the ATM address of the destination terminal device 2f. In this way, the extended domain name table 110 includes, for example,
The ATM address is also stored as shown in FIG. Subsequent sequences are the same as in the first embodiment, and will not be described.

As described above, in the address recognition system according to the present embodiment, when the domain name server makes an ATM address inquiry, the ATM address is registered in its own extended domain name table. The time until the start of communication can be further reduced than in the first embodiment.

Embodiment 3 In this embodiment, having the extended domain name table is the same,
Another case in which the data update timing is different will be described.
In the second embodiment, when the domain name server receives the extended protocol address inquiry signal as a trigger, the extended domain name table is updated, but here, the ATM managed by the ATM address management server in advance is updated.
At the timing when the address table is changed, the set of the ATM address and the protocol address is notified to the domain name server.

FIGS. 11 and 12 are diagrams showing a configuration example and an operation flow of the domain name server in the present embodiment, and FIGS. 13 and 14 are diagrams showing a configuration example and an operation flow of the ATM address management server. is there. FIG.
FIG. 5 is a signal sequence diagram showing operations of inquiry and connection setting in the system according to the present embodiment.

Next, the operation of this embodiment will be described with reference to FIGS. 1, 5 to 6, 9, and 11 to 15. In response to an address registration request from the terminal device 2f or an instruction from the network management device 5, the ATM address management server 4b
When the address information of the terminal device 2f is registered in the ATM address table 106 managed by the ATM address table 106 (S1 in FIG. 12).
6), the ATM address management server 4b sends an ATM address registration instruction 80 including the protocol address and the ATM address of the terminal device 2f in FIG. 15 to the domain name server 3b (S65). The name server 3b (S in FIG. 14) receiving the ATM address registration instruction 80
71) searches the extended domain name table 110 managed by itself using the included protocol address as a key (S72), and includes it in the ATM address registration instruction 80 corresponding to the relevant protocol address. The set ATM address is set (S74). As described above, according to the present embodiment, the ATM address registration function is
To S74. Subsequent sequences are the same as in the first embodiment, and will not be described.

As described above, in the address recognition system according to the first embodiment, the registration of the ATM address to the domain name server is performed in advance, so that the first embodiment is used.
This has the effect of shortening the time up to the start of communication as compared with.

Embodiment 4 FIG. In Embodiment 3, the ATM
When a change has occurred in the ATM address table of the address management server, an ATM address registration instruction is sent to the domain name server. In this embodiment, when the extended domain name table managed by the domain name server is changed at another timing, an ATM address inquiry is made to the ATM address management server. Even in this case, the time until connection setting can be further reduced. 16 and 17 are diagrams showing a configuration example and an operation flow of the domain name server according to the present embodiment. FIG. 18 is a signal sequence diagram showing operations of inquiry and connection setting in the system according to the present embodiment.

The address inquiry operation in the present embodiment will be described with reference to FIGS.
8, and will be described with reference to FIGS. When the address information of the terminal device 2f is registered in the extended domain name table 110 managed by the domain name server 3b in response to a domain name registration request from the terminal device 2f or an instruction from the network management device 5, the extended domain When a change occurs in the name table 110 (S81 in FIG. 17),
If there is no identical entry in S83, the domain name server 3b sends an ATM address inquiry signal 78a including the protocol address of the terminal device 2f to the ATM address management server 4b as shown in FIG. 18 (S85). ). Upon receiving the ATM address inquiry signal 78a, the ATM address management server 4b refers to its own ATM address table 106 and determines whether the protocol address and the ATM address of the destination terminal device 2f are registered. When the ATM address of the terminal device 2f is registered in the ATM address table 106, A
A TM address inquiry response signal 78b is sent to the domain name server 3b. The domain name server 3b (S) receiving the ATM address inquiry response signal 78b
86) searches the extended domain name table 110 managed by itself using the included protocol address as a key, and searches for the ATM address included in the ATM address registration instruction corresponding to the corresponding protocol address. An address is set (S87). Subsequent sequences are the same as in the first embodiment, and will not be described.

As described above, the address recognition system according to the present embodiment has the same effect as that of the third embodiment, and it is not necessary to add a new message between the domain name server and the address management server. There is also an effect.

Embodiment 5 In the second to fourth embodiments, an inquiry from a terminal, a domain name server,
Alternatively, the extended domain name table is changed at the timing of registration or change in the table of the ATM address management server. In the present embodiment, two servers are combined and, for example, the AT
Added M address management mechanism. 19 and 20 are diagrams showing a configuration example and an operation flow of the domain name server according to the present embodiment. FIG.
FIG. 4 is a signal sequence diagram showing an inquiry and connection setting operation in the system according to the present embodiment.

The address inquiry operation in the present embodiment will be described with reference to FIGS. 1, 5 to 6, 9, and 19 to 21.
This will be described with reference to FIG. When registering the address information of the terminal device 2f in the extended domain name table managed by the domain name server 3b in response to a domain name registration request from the terminal device 2f or an instruction from the network management device 5, the domain name The server 3b registers a domain name, a protocol address, and an ATM address. Subsequent sequences are the same as in the first embodiment, and will not be described.

As described above, in the address recognition system according to the present embodiment, the ATM address of the destination terminal device can be obtained only by making an inquiry to the server once, which has the effect of shortening the time until communication starts.

[0041]

As described above, according to the present invention, the server transfers an address inquiry from a terminal and returns the response together with the address inquiry from the terminal. This has the effect of shortening the time.

Furthermore, since the address is also stored in the server, the time until the start of communication is further reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of an ATM address recognition system.

FIG. 2 is a diagram illustrating a domain according to the first embodiment of the present invention;
It is a figure showing the example of composition of a name server.

FIG. 3 is a diagram illustrating a domain according to the first embodiment of the present invention.
It is a figure showing the operation flow of a name server.

FIG. 4 is a signal sequence diagram showing an inquiry and connection setting operation in the ATM address recognition system according to the first embodiment.

FIG. 5 is a diagram showing an example of extended protocol / address inquiry and response information according to the present invention.

FIG. 6 is a diagram showing an operation flow of a terminal device for making a batch inquiry according to the present invention.

FIG. 7 is a diagram illustrating a domain according to Embodiment 2 of the present invention.
FIG. 3 is a diagram illustrating a configuration of a name server.

FIG. 8 is a diagram showing a domain in Embodiment 2 of the present invention.
It is a figure showing the operation flow of a name server.

FIG. 9 is a diagram showing a configuration example of an extended domain name table possessed by a domain name server according to the second to fifth embodiments.

FIG. 10 is a signal sequence diagram showing an inquiry and connection setting operation in the ATM address recognition system according to the second embodiment.

FIG. 11 is a diagram showing a configuration example of a domain name server device according to a third embodiment of the present invention.

FIG. 12 is a diagram showing an operation flow of a domain name server according to Embodiment 3 of the present invention.

FIG. 13 is a diagram showing a configuration example of an ATM address management server device according to a third embodiment of the present invention.

FIG. 14 is a diagram showing an operation flow of an ATM address management server according to Embodiment 3 of the present invention.

FIG. 15 is a signal sequence diagram showing an inquiry and connection setting operation in the ATM address recognition system according to the third embodiment.

FIG. 16 is a diagram showing a configuration example of a domain name server according to Embodiment 4 of the present invention.

FIG. 17 is a diagram showing an operation flow of a domain name server according to Embodiment 4 of the present invention.

FIG. 18 is a signal sequence diagram showing an inquiry and connection setting operation in the ATM address recognition system according to the fourth embodiment.

FIG. 19 is a diagram showing a configuration example of a name server according to Embodiment 5 of the present invention.

FIG. 20 is a diagram showing an operation flow of the domain name server according to Embodiment 5 of the present invention.

FIG. 21 is a signal sequence diagram showing an inquiry and connection setting operation in the ATM address recognition system according to the fifth embodiment.

FIG. 22 is a configuration diagram illustrating an example of a conventional address recognition system.

FIG. 23 is a diagram showing a signal sequence in a conventional address recognition system.

FIG. 24 is a diagram showing a configuration example of a conventional domain name server.

FIG. 25 is a diagram showing a configuration example of a domain name table in a conventional domain name server.

FIG. 26 is a diagram showing a configuration example of a domain name server address table in a conventional name server.

FIG. 27 is a diagram illustrating a configuration example of a conventional ATM address management server.

FIG. 28: AT in conventional ATM address management server
FIG. 3 is a diagram illustrating a configuration example of an M address table.

FIG. 29: AT in a conventional ATM address management server
FIG. 4 is a diagram illustrating a configuration example of an M address management server address table.

FIG. 30 is a flowchart showing an operation up to data communication in a conventional terminal device.

FIG. 31 shows a conventional inquiry signal and a response signal for inquiring a destination protocol address from a destination domain name.

[Explanation of symbols]

1 and 1a-1e ATM switching equipment, 2 and 2a-
21 terminal device, 3 and 3a to 3d domain name server, 4 and 4a to 4b ATM address management server, 5 network management device, 6 and 6a to 6b logical subnet, 71a to 71d protocol address inquiry signal, 71c to 71d extension Protocol address inquiry signal, 72a-72b Protocol address inquiry response signal, 73a-73b ATM address inquiry signal, 74a-74b ATM address inquiry response signal, 75 connection setting instruction signal, 76 connection setting response signal Data transfer, 78a ATM address Inquiry signal, 78b ATM address inquiry response signal, 79a-79b Extended protocol address inquiry response signal, 80 ATM address registration instruction signal, 1
00 Domain name server communication function between domain name servers, 101 Protocol address response function, 102 Domain name table, 103 Domain name server address table, 104 AT
ATM address management server communication function of M address management server, 105 ATM address response function, 106 A
TM address table, 107 ATM address management server address table, 108 ATM address inquiry function, 109 extended protocol address response function, 110 extended domain name table, 111
ATM address registration function, 112 ATM address notification function, 113 ATM address inquiry function.

Claims (5)

[Claims] 1. An ATM (Asynchronos T)
In a system for performing communication between terminals in a transfer mode, if a user wants to know a physical address of a destination terminal, the terminal device transmits extended protocol address inquiry information including a protocol address, and sets a connection from response information; A domain name table for storing correspondence between protocol addresses and domain names of a plurality of terminals, an ATM address inquiry mechanism for transmitting ATM address inquiry information upon receiving the extended protocol address inquiry information, and receiving a response; A domain name server that returns a response to the extended protocol address inquiry information including the received ATM address inquiry response to the terminal, and a correspondence between the protocol addresses and the ATM addresses of the plurality of terminals. An ATM address table for storing the relationship is provided, and the ATM address management server sends the ATM address inquiry response by referring to the ATM address table when receiving the ATM address inquiry information. ATM address recognition system. 2. The domain name table in the domain name server stores the correspondence with the ATM address, transmits ATM address inquiry information to the address management server at a predetermined timing, and receives the returned ATM address. 2. The ATM address according to claim 1, wherein a response to the extended protocol address inquiry information is returned to the terminal by referring to the domain name table. Recognition system. 3. The ATM address recognition system according to claim 2, wherein the predetermined timing is a timing of registering or changing the correspondence between the protocol address and the ATM address of the terminal. 4. The ATM address recognition system according to claim 2, wherein the predetermined timing is a timing of registering or changing the correspondence between the protocol address of the terminal and the domain name. 5. A domain name server comprising an address management server mechanism having an ATM address table for storing a correspondence between a protocol address of a plurality of terminals and an ATM address, and inquiring an extended protocol address from the terminal. 2. The ATM according to claim 1, wherein upon receiving the information, a response is made including the ATM address.
Address recognition system.