JP2000032044A - Data communication system, method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To start the communication of data from a static host to a dynamic host with no special change required by performing the arbitration of addresses between the dynamic host and its component protocol server and then sending an Internet address that is given from the protocol server to a common host. SOLUTION: When a dynamic host HOST 1 is set in an operable state, the HOST 1 sends an IP address request to a HOST 2 to obtain an Internet address. Receiving the address request, the HOST 2 sends an Internet address to the HOST 1 in reply to the IP address request among those Internet address groups. Thus, a file transfer protocol server FTPD 14 and an information outgoing server HTTPD 15 of the HOST 1 can function. Then the HOST 1 sends a file where its own Internet address is described to a HOST 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication method using an Internet address in a data communication network, and more particularly to a data communication method using a dynamically assigned Internet address, a method and a data communication apparatus. About.

[0002]

2. Description of the Related Art An example of a conventional mobile packet communication system using a data communication system using a dynamic packet address is described in Japanese Patent Application Laid-Open No. 10-13904. As shown in FIG. 5, in this conventional mobile packet communication system, a gateway relay exchange 51 functions as a node directly connecting the mobile packet communication network 5 and the fixed packet communication network 6, and a plurality of exchanges 52. , 53, the packet communication data between the mobile communication terminals 54, 55 connected to the mobile packet communication network 5 and the fixed communication terminal 61 connected to the fixed packet communication network 6. Relay.

At this time, the gateway switching center 5 has a function of dynamically assigning a packet address to the mobile communication terminals 54 and 55 which start packet communication, and a function of providing mobile communication terminals 54 and 55 which end packet communication. 55, the mobile communication terminal 5 having a function of releasing the assignment of the dynamically assigned packet address and having a dynamic packet address.
The packet communication data is relayed between the fixed communication terminal 61 and the fixed communication terminal 61 having a fixedly assigned packet address.

[0004]

However, the above-mentioned conventional system is used to convert a fixed communication terminal having a fixedly assigned packet address to a mobile communication terminal having a dynamically assigned packet address. When starting packet communication, a special procedure is required for inquiring and acquiring the packet address of the mobile communication terminal of the communication partner from the gateway relay exchange in advance. That is, the fixed communication terminal needs to send out a packet with the packet address of the mobile communication terminal of the communication partner as the destination address and the packet address of the fixed communication terminal as the source address.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an Internet address that identifies a data communication host in a data communication network is a dynamic host configuration protocol (D).
After arbitration with the HCP) server, a dynamic host dynamically assigned only during communication and an internet address for identifying a data communication host are selected from an Internet address group including a network address and a host address.
Data that communicates by the datagram method in which a static host whose address is fixedly assigned, regardless of whether it is communicating or not, coexists from an Internet address group consisting of a network address and a host address. To provide a method for initiating data communication from a static host to a dynamic host in a communication network without any special change to a data communication method using a static Internet address. is there.

[0006]

According to the data communication system of the present invention, in a data communication network in which the dynamic host and the static host coexist and communicate in a datagram system, an Internet address and a host name of the dynamic host are provided. An information transmission server that makes a table that associates
A common host having a function of receiving a dynamically assigned Internet address transmitted from a dynamic host and arranging the Internet address in an Internet address setting area corresponding to a host name in the content; A dynamic host configuration protocol client function for arbitrating addresses with the dynamic host configuration protocol server, and sending the Internet address assigned by the dynamic host configuration protocol server after the address arbitration to the common host. It is characterized by having a function.

Further, the present invention provides an information transmission server which makes a table in which an Internet address of a dynamic host is associated with a host name as a content, a dynamic host configuration protocol
A common host having a function of receiving an Internet address of a dynamic host transmitted from a server and locating the Internet address in an Internet address setting area corresponding to a host name in the content; and a dynamic host configuration protocol server. The host having the function of sending the Internet address of the arbitrated dynamic host to the common host.

According to the present invention, an Internet address for identifying a data communication host in a data communication network is composed of a network address and a host address after arbitration with a Dynamic Host Configuration Protocol (DHCP) server. A dynamic host dynamically assigned only during communication from the Internet address group, and the Internet address for identifying the data communication host is an Internet address composed of a network address and a host address. In a data communication network in which a static host which is fixedly assigned regardless of whether or not in communication is present from the group and communicates in a datagram manner, data communication from the static host to the dynamic host is performed. Start using a static Internet address In addition, it characterized by using dynamic Internet addresses without special changes.

[0009] The present invention also provides a method, wherein an Internet address identifying a data communication host in a data communication network, after arbitration with a dynamic host configuration protocol server,
A dynamic host part dynamically assigned only during communication from an Internet address group consisting of a network address and a host address, and an Internet address for identifying the data communication host are included in the network address.
A data communication device that includes a static host unit that is fixedly assigned regardless of whether or not communication is being performed from an Internet address group composed of an address and a host address; An information transmitting unit that converts a table in which the Internet address and the host name of the dynamic host are associated with each other into a content, and receives the dynamically assigned Internet address transmitted from the dynamic host; A common part having a function of arranging in the Internet address setting area corresponding to the host name in the host, and the dynamic host configuration protocol for performing the address arbitration between the dynamic host and the dynamic host configuration protocol server A client function, and from the dynamic host configuration protocol server after the address arbitration Wherein characterized in that it has a static host unit a is an Internet address includes a function of sending out to the common host.

Therefore, when starting data communication from a static host having a fixedly assigned Internet address to a dynamic host having a dynamically assigned Internet address, the communication partner's dynamic host It is only necessary to use a protocol used in the general Internet, which refers to the Internet address of the information transmission server by clicking a hyperlink in the correspondence table of the information transmission server,
Data can be transmitted and received without any special procedure.

[0011]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a data communication system using a data communication system according to a first embodiment of the present invention.

In FIG. 1, a HOST 1 is a dynamic host, and includes a NIC (Network Interface Card) 11 connected to a network LAN (Local Area Network) 100 and an IP (Internet Protocol) connected to the NIC 11. ) 12 and IP
A TCP (Transmission Control Protocol) 13 connected to the TCP 12, an FTPD (File Transfer Protocol Server) 14 connected to the TCP 13,
It is composed of an HTTPD (Information Transmission Server) 15 connected to the CP 13 and transmitting information, and a DHCP (Dynamic Host Configuration Protocol) client 17 connected to the IP 12, and each unit is constituted by software. , Are separated by sending and receiving data,
It is separated for the sake of explanation and does not show physical connection.

A HOST 2 is a host having a DHCP server, and includes an NIC 21 connected to the network LAN 100, an IP 22 connected to the NIC 21,
DH connected to IP22 and dynamically setting IP address
And a CP (Dynamic Host Configuration Protocol) server 23.

HOST3 is a common host,
An NIC 31 connected to the network LAN 100;
IP32 connected to NIC31, TCP33 connected to IP32, and FTPD connected to TCP33
(File transfer protocol server) 34 and TCP 33
(Information transmission server) 35 that is connected to the server and transmits information, and a common HP (content) connected to the FTPD 34 and the HTTPD 35.

HOST4 is a static host,
An NIC 41 connected to the network LAN 100,
Search for information by combining IP 42 connected to NIC 41, TCP 43 connected to IP 42, FTP (File Transfer Protocol) 46 connected to TCP 43, and related information connected to TCP 43 and distributed throughout the world (World Wide Web) browser 47, which is a browser such as Netscape or Explorer.

In FIG. 1, HOST 1 indicates that an Internet address for identifying a data communication host in the data communication network 100 has been arbitrated with a dynamic host configuration protocol server (DHCP server) 23 through a DHCP client 17. , A dynamic host dynamically assigned only during communication from an Internet address group consisting of a network address and a host address.

The HOST 1 has a dynamic host configuration protocol client function (DHCP client) for performing address arbitration with a configuration protocol server (DHCP server) of the dynamic host 1 in the HOST 2.
It has a function of sending an Internet address assigned from a dynamic host configuration protocol server (DHCP server) to the common host (HOST3) after address arbitration.

The HOST 2 is a host having a dynamic host configuration protocol server (DHCP server) that performs arbitration for dynamically assigning an Internet address for identifying a data communication host in the data communication network 100 only during communication. It is.

The HOST 3 is an information transmission server (HTTP) for converting a table in which the Internet address of the dynamic host 1 is associated with the host name into a content (common HP).
D) and a function (FTPD) of receiving a dynamically assigned Internet address transmitted from a dynamic host and arranging it in an Internet address setting area corresponding to a host name in the content (common HP) Is a common host with

The HOST 4 has a network address for identifying the data communication host.
It is a static host that is fixedly assigned from an Internet address group consisting of an address and a host address regardless of whether communication is in progress or not.

The HOSTs 1, 2, 3, and 4 are connected by a bus system in a local area network (LAN), and each host is connected to an OSI (Open Systems Interface).
Section) A network interface card (NIC) having the functions of the first and second layers of the reference model and the third
It has an Internet Protocol (IP) with layer functions. Incidentally, the seven layers of the OSI reference model are composed of an application layer, a presentation layer, a session layer, a transport layer, a network layer, a data link layer, and a physical layer from an upper layer, and are directly in contact with a transmission line. Physical layer.

Each of the HOSTs 1, 3, and 4 further has a transmission control protocol (TCP) having a function of a fourth layer of a transport layer, and an application of an upper layer and an Internet protocol (IP) of a third layer. Bridge between the two.

HOST1 is a file transfer protocol server (FTPD) as an upper layer application.
14, an information transmission server (HTTPD) 15, and a file transfer protocol (FTP) 16.

In the HOST 2, a dynamic host configuration protocol server (DHCP server) 23 and a network interface card (NIC) 21 are directly connected via a second layer Internet Protocol (IP).

The HOST 3 has a file transfer protocol server (FTPD) 34 and an information transmission server (HTTPD) 35 that share a common HP 36 as upper layer applications.

The HOST 4 has a WWW browser 47 and a file transfer protocol (FTP) 46 as upper layer applications.

FIG. 2 is a block diagram of a data communication system using the data communication system according to the present invention.

The difference from FIG. 1 is that the function of sending the Internet address of the dynamic host 1 after the dynamic Internet address arbitration to the common host (HOST3) is as follows.
Dynamic host configuration protocol server (DHCP server)
Is performed from the host (HOST2) having

Next, the operation of one embodiment of the data communication system using the data communication system of FIG. 1 will be described with reference to FIG. In FIG. 3, mutual roles of HOSTs 1, 2, 3, and 4 are arranged. In the sequence diagram of FIG. 3, when the dynamic host (HOST1) becomes operable, an Internet address is assigned. Therefore, the dynamic host configuration protocol client function (DHCP client) of HOST1 transmits the dynamic host of HOST2. An "IP address request" is sent to the configuration protocol server (DHCP server) (S1).

The HOST 2 receiving this command sends an Internet address that can be assigned from the Internet address group.
The address is sent to the dynamic host (HOST1) by "IP address return" (S2). Now, the FT of HOST1
The PD and HTTPD functions become operable. The dynamic host (HOST1) then switches to the Internet
The address is set as the source address, the destination address is set as the common HOST (HOST3), and the file describing the Internet address of the own host is stored in the common host (HOS).
T3) is sent out with "IP address registration" (S3).

When the static host (HOST4) starts communication for utilizing the FTPD and HTTPD functions of the dynamic host (HOST1), first, information transmission from the common host (HOST3) using a WWW browser. The contents of the correspondence table of the dynamic host provided by the server (HTTPD) and its Internet address are accessed as "URL reference" (S4), and the correspondence table of the host name and its Internet address is displayed as "URL display". (S5).

By clicking the corresponding hyperlink on the WWW browser, a static host (HOST) is clicked.
4) uses its own Internet address as a source address and sets a destination address as a dynamic HOST (HOST
The Internet Protocol datagram “IP datagram transmission” made in 1) is directly transferred to a dynamic host (HOS
It can be transmitted to the FTPD or HTTPD in T1) (S6).

Upon receiving the Internet protocol datagram "IP datagram transmission", the dynamic host (HOST1) FTPD or HTTPD can send out a content according to the request,
The static host (HOST4) can receive the Internet protocol data "IP datagram reception" (S7). With this dynamic IP address, transmission and reception of desired data information can be performed by utilizing the WWW browser 47 and the like.

Next, the operation of one embodiment of the data communication system using the data communication system of FIG. 2 will be described with reference to FIG.

In the sequence diagram of FIG. 4, the dynamic host (HOST1) is sent from HOST2 to the assignable Internet address from the Internet address group by "IP address return" (S2), and FIG. 3, the Internet address information provided with the dynamic host (HOST1) is transferred to the host (HOS) having the dynamic host configuration protocol server (DHCP server).
The point is that the IP address is directly transmitted from the T2) to the common host (HOST3) by “IP address registration” (S13). this is,
HOST2 assigns a dynamic IP address to HOST1, and sends "IP address registration" to HOST3. The subsequent operation is the same as in FIG.

In the above embodiment, HOST1 to HOST4
An example in which a dynamic Internet address is registered and IP datagrams are exchanged has been described. However, each HOST is not required, and HOST1 to HOST4 are integrally configured to connect to an intranet, for example. It can be used together with a server for external interface. In particular, a router having a WWW Internet configuration can transmit and receive data on the Internet using a dynamic Internet address and host name. That is, a dynamic HOST1, a HOST2 having a DHCP server in which an Internet address correspondence table is placed, a common HOST3, and a static HOST4.
Are configured integrally as one server, the start of data communication between the static host and the dynamic host can be started not only by a data communication method using a static Internet address but also by a dynamic Internet address. It is possible to register at high speed, achieve a plurality of operation start protocols in the own server, and transmit and receive data.

[0038]

As described above, according to the present invention, the correspondence table between the host name of the dynamic host and the Internet address dynamically given is provided in the common host so that the host can be referred to by a general host. Therefore, the data communication from the static host to the dynamic host can be started without any special change in the data communication method using the static Internet address.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram (part 1) according to the present invention.

FIG. 2 is a system configuration diagram (part 2) according to the present invention;

FIG. 3 is a sequence diagram (part 1) according to the present invention;

FIG. 4 is a sequence diagram (part 2) according to the present invention;

FIG. 5 is a block diagram of a mobile packet communication system.

[Explanation of symbols]

1 HOST1: Dynamic host 2 HOST2: Host with DHCP server 3 HOST3: Common host 4 HOST4: Static host 12, 22, 32, 42 IP: Internet protocol 13, 33.43 TCP: Transmission control protocol 17, 23 DHCP: Dynamic Host Configuration Protocol 36 Common HP: Content 15, 35 HTTPD: Information Transmission Server 14, 34 FTPD: File Transfer Protocol 11, 21, 31, 41 NIC: Network Interface Card 48 WWW: World Wide Web 100 LAN: Local Area Network

Claims (5)

[Claims] An Internet address identifying a data communication host in a data communication network is provided after arbitration with a dynamic host configuration protocol server.
A dynamic host dynamically assigned only during communication from an Internet address group consisting of an address and a host address, and an internet address for identifying the data communication host comprises a network address and a host address. And a static host that is fixedly assigned irrespective of whether it is communicating or not from a group of Internet addresses to be communicated with each other. An information transmission server for converting a table in which an address and a host name are associated with each other; and receiving the dynamically assigned Internet address transmitted from the dynamic host and corresponding to the host name in the content. With a function to place in the Internet address setting area A common host, the dynamic host configuration protocol client function for performing address arbitration between the dynamic host and the dynamic host configuration protocol server, and the dynamic host configuration protocol server provided after the address arbitration. And a static host having a function of transmitting the Internet address to the common host. 2. A data communication network in which a dynamic host and a static host coexist and communicate by a datagram method. An information transmission server that converts a table in which an Internet address of the dynamic host is associated with a host name into a content. Receiving an Internet address of a dynamic host transmitted from the dynamic host configuration protocol server, and receiving an Internet address corresponding to a host name in the content.
A static host having a function of sending the Internet address of the dynamic host after arbitration to the host having the dynamic host configuration protocol server; A data communication system comprising: a host; 3. An Internet address identifying a data communication host in a data communication network, after arbitration with a Dynamic Host Configuration Protocol (DHCP) server.
A dynamic host dynamically assigned only during communication from an Internet address group consisting of a network address and a host address; and the internet address for identifying the data communication host.
Data that communicates by the datagram method in which a static host whose address is fixedly assigned, regardless of whether it is communicating or not, coexists from an Internet address group consisting of a network address and a host address. In a communication network, initiating data communication from the static host to the dynamic host using a dynamic Internet address without any special modification, in addition to using a static Internet address A data communication method comprising: 4. A dynamically operating data communication host searches an Internet address group consisting of a network address and a host address for an Internet address dynamically assigned only during communication, and performs the search. The information transmitting unit detects the Internet address as a content in a table in which the Internet address and the host name of the data communication host are associated, and the common unit receives the Internet address, and Internet corresponding to the host name of
The static host unit executes the dynamic host configuration protocol client function of performing address arbitration between the data communication host and a dynamic host configuration protocol server; A data communication method, wherein an Internet address given by the dynamic host configuration protocol server is sent to the common unit later. 5. An internet address identifying a data communication host in the data communication network, after arbitration with a dynamic host configuration protocol server, the
A dynamic host part dynamically assigned only during communication from an Internet address group consisting of an address and a host address; and an internet address for identifying the data communication host is obtained from a network address and a host address. A data communication device that communicates in a datagram manner, comprising: An information transmitting unit having a dynamic host configuration protocol server (DHCP server) for performing arbitration for dynamically assigning a table in which an Internet address and a host name are associated with each other only during communication, and transmitted from the dynamic host; Receiving the dynamically assigned Internet address, and A common part having a function of arranging in the Internet address setting area corresponding to the host name in the dynamic host configuration protocol for performing the address arbitration between the dynamic host and the dynamic host configuration protocol server. The static host unit having a client function and a function of sending an Internet address given from the dynamic host configuration protocol server to the common host after the address arbitration. Data communication device.