JP2004056382A - Network system and network branching apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a network system and a network branching apparatus wherein a user can perform data communication in a large capacity while the user terminal is connected to the existing Internet. <P>SOLUTION: The network branching apparatus 2 comprises: a switching hub 21 for connecting communication from a terminal 3 in compliance with the IPv4 protocol and the IPv6 protocol to an optimum router; an IPv6 router 22 making communication in compliance with the IPv6 protocol with the switching hub 21; and an IPv4 router 23 making communication in compliance with the IPv4 protocol with the switching hub 21. Thus, the terminal 3 is made to have a network configuration able to be connected to both networks. A network system 1 is an IPv6 network of a closed network using the IPv6 protocol and connected to the network branching apparatus 2 via the IPv6 router 22. Further, the network system 1 is provided with a DNS server 12, which is connected to a DNS server 45n in an IPv4 network 4. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a network system and a network branching device that can be connected to another network while being connected to an Internet environment of an IPv4 (Internet Protocol Version 4) protocol.
[0002]
[Prior art]
2. Description of the Related Art In recent years, Internet users (hereinafter, referred to as users) are often connected to the Internet using a protocol of PPPoE (PPP over Ethernet, Ethernet is a registered trademark). By using this, the user can enjoy a constant connection service using an ADSL (Asymmetric Digital Subscriber Line), a CATV (Community Antenna Television), an optical fiber, or the like, and can easily switch an ISP (Internet Service Provider) to be connected. The ISP provides various communication services under such an environment.
[0003]
In addition, the ISP may provide a communication service by using a private closed network (IPv4 protocol) 50 separately from the Internet network as shown in FIG. Furthermore, there is an ISP that provides a connection to the Internet (experimental IPv6 Internet) 60 using the IPv6 (Internet Protocol Version 6) protocol as shown in FIG.
[0004]
On the other hand, in such a network environment, there is a demand for a user to perform communication of large-capacity contents such as a moving image distribution service and large-capacity file exchange.
[0005]
[Problems to be solved by the invention]
However, under such a network environment, there is a problem that it is difficult for a user to communicate a large amount of data. In other words, in the current Internet network, a large number of for-profit and non-profit organizations are in a state of confusion, and the state of the infrastructure is also diverse, causing various communication bottlenecks. There is a problem that is not suitable. Further, in a closed network using the IPv4 protocol, since the infrastructure is constructed under the control of one operator, there is no bottleneck in performing large-capacity communication, but the user can use the Internet network or the closed network. It is necessary to change the settings on the terminal side every time the connection is made, so that there is a problem in that the setting work is troublesome for the user. This is due to the fact that the information on the route setting of the terminal is overwritten by the information set later, and that the address used in the closed network cannot be resolved via the Internet. Also, in the IPv6 Internet network, communication is not performed end-to-end using the IPv6 protocol, but is performed after being converted into the IPv4 protocol by the tunnel devices 8 and 61 as shown in FIG. There is a problem that it becomes complicated and a bottleneck occurs.
[0006]
The present invention has been made to solve the above problems, and provides a network system and a network branching device that enable a user to easily perform large-capacity data communication while connecting to the Internet network of the IPv4 protocol. The purpose is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention according to claim 1 has a first DNS server, a first router corresponding to an IPv4 protocol, and an IPv4 network connected to an Internet network and the first network. A network system of a user terminal capable of communicating with an IPv4 protocol and an IPv6 protocol, which communicates via a router and a switching hub, and a closed network of an IPv6 protocol, which performs communication via the switching hub, wherein the first A second DNS server connected to the DNS server, a second router connected to the switching hub and corresponding to an IPv6 address, and a communication partner whose previous user terminal has a desired IPv6 address; When communicating, the communication via the first DNS server causes the second DNS server to perform the communication. To resolve IPv6 addresses Shin opponent based on the resolved the IPv6 address, and summarized in that is configured to communicate with a desired communication partner via the switching hub and the second router.
[0008]
Here, the “DNS server” is a device that provides a service that enables a corresponding IP address to be acquired from a host name in a TCP / IP network, and is a database that describes the correspondence between the host name and the IP address. The IP address is referred to from the host name in response to a request from the user terminal. The configuration may be any configuration such as a single device or a system in which a plurality of distributed devices are connected to a network. A “router” is a network device that interconnects different networks, and is a device that relays data to a destination network according to a routing table in which communication paths are described. The “switching hub” is a node that relays a network and refers to a concentrator having a switching function.
[0009]
According to the first aspect of the present invention, in a network configuration using both an IPv4 network and an IPv6 network, the second DNS server is connected to the first DNS server, and the user terminal is a switching hub and a router. When the user terminal communicates with a communication partner having a desired IPv6 address via the first DNS server, the user terminal communicates with the communication partner via the first DNS server. The IPv6 address is resolved, and communication with a desired communication partner is performed via the switching hub and the second router based on the resolved IPv6 address. As a result, in a network using both the IPv4 network as the Internet network and the IPv6 network as the closed network, both networks can be seamlessly linked without burdening the user. Large-capacity data communication can be easily performed using an IPv6 network while maintaining an environment for connecting to the Internet.
[0010]
According to a second aspect of the present invention, in the first aspect of the present invention, a customer management device for managing a customer of a communication service provided by using the closed network of the IPv6 protocol and a user terminal of the customer are provided. And a service providing device that provides a communication service.
[0011]
Here, "customer management device" and "service providing device" are generically referring to devices capable of realizing the functions of the present invention by a program, and include a supercomputer, a general-purpose computer, an office computer, a workstation, Including all forms such as personal computers. The configuration may be any configuration such as a single device or a system in which a plurality of distributed devices are connected to a network.
[0012]
According to the second aspect of the present invention, in a communication service using a closed network of the IPv6 protocol, a customer management device manages a customer of the communication service, and the service providing device sends a communication service to a user terminal according to the customer management. Make an offer. This makes it possible to provide services based on customer management.
[0013]
According to a third aspect of the present invention, in the second aspect of the present invention, the customer management device stores customer information in association with a line and an IPv6 network address for assigning customer information on the customer to the customer when applying for a service from the customer. A customer information registering means for registering the IPv6 network address for each line, a router setting means for setting the second router so as to assign the IPv6 network address to each line, and a user terminal for connecting a service from the customer. And line management means for performing line authentication by referring to the customer information corresponding to the IPv6 network address included in the transmission information of the IPv6 network, wherein the second router is provided with the IPv6 address assigned by the router setting means. Automatic distribution means for automatically distributing a network address to the user terminal of the customer. The gist of the door.
[0014]
Here, the “IPv6 network address” refers to a prefix portion of the upper 64 bits of the IPv6 address.
[0015]
According to the third aspect of the present invention, the customer management device registers the customer information in the customer information storage unit in association with the line to be assigned to the customer and the IPv6 network address when applying for a service from the customer. Configure the second router to assign a network address. Then, the second router automatically distributes the allocated network address to the user terminal of the customer. Then, when connecting the service from the customer, the customer terminal device performs the line authentication with reference to the customer information corresponding to the network address included in the transmission information from the user terminal. Thus, the communication service can be automatically started without causing the customer to perform troublesome terminal setting work. In addition, since line authentication can be performed in providing a communication service, fine-grained customer management can be performed.
[0016]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the customer management device associates an IPv6 address transmitted from the user terminal with customer information and registers the IPv6 address in the customer information storage unit. Customer information registration means, and terminal management means for performing terminal authentication by referring to the customer information corresponding to the IPv6 address included in the transmission information from the user terminal when connecting a service from the customer, The gist is to have
[0017]
According to the present invention, the customer management device associates the IPv6 address transmitted from the user terminal with the customer information and registers it in the customer information storage unit. Terminal authentication is performed with reference to the customer information corresponding to the IPv6 address included in the transmission information from the terminal. As a result, terminal authentication can be performed in providing a communication service, so that more detailed customer management can be performed.
[0018]
According to a fifth aspect of the present invention, in the invention of the fourth aspect, the customer management device receives a user terminal name transmitted from the user terminal, registers the user terminal name in the customer information storage unit, and The gist is to have a terminal name management means for registering also in the second DNS server.
[0019]
According to the present invention, the customer management device receives the user terminal name transmitted from the user terminal, registers the user terminal name in the customer information storage unit, and further registers the user terminal name in the second DNS server. Accordingly, communication between users can be performed using the user terminal name, so that communication between P2P (Peer to Peer) can be promoted.
[0020]
According to a sixth aspect of the present invention, a user terminal capable of communicating with the Ipv4 protocol and the Ipv6 protocol is provided with an IPv4 network which is an Internet network of an IPv4 protocol having a first DNS server, and a second DNS server. A network branching device for communicating with an IPv6 network in which the first DNS server and the second DNS server are connected, which is a closed network of the IPv6 protocol, and which is connected to the IPv4 network and supports the IPv4 protocol A first router, a second router that connects to the IPv6 network and supports the IPv6 protocol, a switching hub that connects the first router and the second router to the user terminal, respectively, The gist is to have
[0021]
According to the sixth aspect of the present invention, a user terminal capable of communicating with the Ipv4 protocol and the Ipv6 protocol is provided with an IPv4 network, which is an Internet network of the IPv4 protocol including the first DNS server, and a second DNS server. In order to enable communication with an IPv6 network to which a first DNS server and a second DNS server are connected, a first router compatible with the IPv4 protocol is connected to the IPv4 network. The second router supporting the IPv6 protocol is connected to the IPv6 network, the switching hub is connected to the first router, and the second router is connected to the user terminal. As a result, in a network using both the IPv4 network as the Internet network and the IPv6 network as the closed network, both networks can be seamlessly linked without burdening the user. Large-capacity data communication can be easily performed using an IPv6 network while maintaining an environment for connecting to the Internet.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
<First embodiment>
FIG. 1 is a network configuration diagram using a network system 1 and a network branching device 2 according to a first embodiment of the present invention. The terminal 3 is a dual stack terminal capable of communicating with both the IPv4 protocol and the IPv6 protocol (for example, Windows XP / 2000 has a dual stack function, Windows is a registered trademark), and the terminal 3 and the network branching device 2 are optical. They are connected by fiber or ADSL lines. The network branching device 2 is installed at an entrance of an IPv6 network 10 which is a closed network, and a switching hub 21 for connecting IPv4 protocol and IPv6 protocol communication from the terminal 3 to an optimal router for each protocol. An IPv6 router 22 that communicates with the IPv6 protocol, and an IPv4 router 23 that is arranged at the entrance of the IPv4 network 4 that is the Internet network and communicates with the switching hub 21 using the IPv4 protocol. As a result, the dual stack terminal 3 has a network configuration capable of connecting to both networks.
[0024]
Here, the switching hub 21 converts communication of a user using an optical fiber or ADSL to a media converter for converting between light and Ethernet, or a DSLAM (DSLAM) for converting between ADSL and Ethernet or ATM (Asynchronous Transfer Mode). Digital Subscriber Line Access Multiplexer (station collective DSL modem) can accommodate a large number. Further, between the switching hub 21 and the IPv4 router 23 and the IPv6 router 22, communication of a plurality of lines from a user is multiplexed, and the number of physical connections can be reduced from the actual number of users. The communication is identifiable.
[0025]
The IPv4 network 4 is roughly classified into a regional IP network 41, a network 42n (i = a, b,..., N) of the ISP, and an Internet network 43. In the regional IP network 41, the use of the PPPoE protocol allows the IPv4 router 23 as a sorting device to select the network terminating device 44n (i = a, b,..., N). And a function of selecting a provider. In the ISP network 42n, each ISP is provided with a DNS (Domain Name System) server 45n (i = a, b,..., N), and the ISP network 42n is connected to the Internet network 43 and the router 46n (i = a, b,..., n), the user can connect to the Internet by setting the DNS setting at the terminal 3 to the DNS server 45n of the ISP to which the user has subscribed. Become.
[0026]
The network system 1 is a closed network IPv6 network using the IPv6 protocol, and is connected to the network branching device 2 via the above-described IPv6 router 22. The network system 1 includes a DNS server 12, which is connected to the DNS server 45n in the IPv4 network 4 described above. Thereby, the DNS server 45n of the IPv4 network 4 and the DNS server 12 of the IPv6 network 10 can cooperate with each other, and the terminal 3 can know the IPv6 address via the IPv4 network 4 as described later. I have.
[0027]
Note that FIG. 1 is a network configuration diagram when a network connection is considered from one terminal 3, and thus only one network branching device 2 (switching hub 21, IPv4 router 23, IPv6 router 22) is illustrated. Actually, there are a plurality of terminals 3 and a plurality of network branching devices 2. A plurality of terminals 3 are connected from the switching hub 21.
[0028]
Next, a network communication method using the network system 1 and the network branching device 2 according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a sequence diagram when the terminal 3 communicates with a desired communication partner.
[0029]
First, the terminal 3 transmits the host name of the communication partner to the DNS server 45n of the IPv4 network 4 via the network branching device 2 because it needs to know the address of the communication partner when performing communication (step S1). Upon receiving the host name, the DNS server 45n resolves the address based on the received host name (Step S2). If the address is an IPv4 address, it can be resolved within the IPv4 network 4. Therefore, the IP address required by the DNS server 45n of the IPv4 network 4 is obtained and transmitted to the terminal 3. Since it is impossible to resolve the IPv6 address in the IPv4 network 4, the request is made to the IPv6 DNS server 12 for address resolution (steps S2 to S6). It should be noted that the DNS server has a specification that makes it possible to reply to an IPv6 address in response to such an inquiry of the IPv4 protocol. Then, the DNS server 12 which has received the host name via the IPv4 DNS server 45n obtains an address corresponding to the host name and transmits it to the terminal 3 (steps S5, S7, S8).
[0030]
As a result, the terminal 3 can know the address of the communication partner, and starts communication with the desired communication partner based on this address (step S9). That is, as a result of the address resolution, in the case of the IPv4 address, the terminal 3 communicates with the desired communication partner in the IPv4 protocol via the switching hub 21 and the IPv4 router 23 of the network branch device 2, and in the case of the IPv6 address. In the IPv6 protocol, the terminal 3 communicates with a desired communication partner via the switching hub 21 and the IPv6 router 22 of the network branching device 2.
[0031]
Next, the function of the above-described network branching device 2 will be described in detail with reference to FIGS. FIG. 3 is a flowchart illustrating the operation of the switching hub 21 of the network branching device 2, and FIG. 4 is a flowchart illustrating the operations of the routers 22 and 23 of the network branching device 2.
[0032]
First, upon receiving a communication packet from the terminal 3, the switching hub 21 determines whether or not the destination address (MAC (Media Access Control Address) address) of the received communication packet is the first received address. And an address table which is a correspondence table between the MAC address and the MAC address (steps S11 and S12).
[0033]
If the destination address is not in the address table, the communication packet is transferred to all ports, so that the communication packet is transferred to both the IPv4 router 23 and the IPv6 router 22 (step S13).
[0034]
Next, the IPv4 router 23 and the IPv6 router 22, which have received the communication packet, determine whether or not the protocol is the same as the protocol supported by the IPv4 router 23 and the IPv6 router 22. If the protocol is the same, the IPv4 router 23 and the IPv6 router 22 transfer the communication packet to the destination address. If not the same, the communication packet is discarded (steps S21 to S24).
[0035]
On the other hand, if the destination address of the communication packet is in the address table, the transfer destination port is already known, so the communication packet is transferred to the corresponding IPv4 router 23 or IPv6 router 22 according to the port of the address table ( Steps S12 and S14).
[0036]
Then, the IPv4 router 23 or the IPv6 router 22, which has received the communication packet, confirms that the protocol is the same as the one corresponding to itself, and transfers the communication packet to the destination address (Steps S21 to S23). Accordingly, the terminal 3 can transmit a communication packet to a desired communication partner via the IPv4 router 23 when the destination address is an IPv4 address and via the IPv6 router 23 when the destination address is an IPv6 address. .
[0037]
As described above, the network branching device 2 automatically determines a difference between different protocols and transmits the difference to a desired destination, so that the user does not need to set a route on the terminal 3 side, and the network connection destination can be changed. It is possible to communicate with a desired communication partner without being conscious. This is because when the network is connected by using both the conventional IPv4 protocol Internet network and the IPv4 protocol closed network, the protocol is the same, so that the terminal side sets the route every time it connects to the Internet network or the closed network. Is required because the closed network protocol is the IPv6 protocol and the network branching device 2 having a configuration taking into account the features of each protocol is provided, so that the branching operation is facilitated.
[0038]
Since the use of the learning function of the switching hub 21 does not transfer useless communication packets, the load on the IPv4 router 23 and the IPv6 router 22 is reduced, and it is possible to increase the communication speed of the entire network. .
[0039]
Therefore, according to the present embodiment, an IPv6 network, which is a closed network of the IPv6 protocol, and a network branching device are provided separately from the IPv4 network, which is the Internet network, and the DNS servers of both networks are linked to use the network. The user does not need to perform terminal setting work such as route setting and DNS setting of the dual stack terminal, and can communicate with a desired communication partner without being aware of a difference in protocol.
[0040]
As a result, it is possible to enjoy a large-capacity communication service without stress from an IPv6 network constructed at high speed and broadband while being connected to an IPv4 network which is the Internet network.
[0041]
In addition, for service providers, using a closed network in which quality is assured, it has begun to provide high-definition moving picture distribution equivalent to a communication service (DVD (Digital Versatile Disk)) and VOIP (Voice over IP) that are not provided by the conventional Internet network. P2P communication, large-capacity file exchange, etc.) can be provided, so that it can be differentiated from other communication services.
[0042]
<Second embodiment>
FIG. 5 is a network configuration diagram using the network system 11 and the network branching device 2 according to the second embodiment of the present invention. In the network system 11 of the present embodiment, a service provider Ai (i = a, b,..., N) such as an ISP or a communication carrier uses the IPv6 network 10 of the network system 1 of the first embodiment. This is a network system for providing a communication service. Note that, in the present embodiment, only configurations and functions different from those of the first embodiment will be described, and the same components as those of the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.
[0043]
As shown in FIG. 5, the service provider Ai has an application server 13n (i = a, b,..., N) for providing a communication service in the IPv6 network 10. The application server 13n is provided with a customer management database (hereinafter, referred to as a customer DB) 16 on a network of another segment via a router 17, and a customer management server 15 for managing customer information is installed. In addition, the customer management server 15 is connected to the Internet 43 via the router 14 so that service applications can be accepted from the Internet 43.
[0044]
As shown in FIG. 6, the customer DB is a database in which customers, lines, and prefix portions of IPv6 addresses are managed in association with each other. Here, as shown in FIG. 7, the IPv6 address has a 128-bit address divided into an upper 64-bit prefix part 71 and a lower 64-bit interface identifier 72. If the prefix portion 71 of the IPv6 address can be ascertained by associating with the port (line), the line used by the customer can be managed.
[0045]
Next, a customer management method of the service provider Ai in the network system 11 will be described.
[0046]
First, the operation of the network system 11 when a user applies for a service will be described with reference to FIG.
[0047]
When the user wants to subscribe to this communication service, the user makes an application from the application screen prepared by the customer management server 15 via the Internet 43 of the IPv4 network 4 (step S31). When receiving the application information of the user, the customer management server 15 associates the user (customer ID) with the line assigned to the user and the prefix portion of the IPv6 address and registers them in the customer DB 16 (step S32). , S33).
[0048]
Next, the customer management server 15 creates a script for setting the IPv6 router 22 based on the information in the customer DB 16, and assigns a line and a prefix portion of the IPv6 address to each port of the IPv6 router 22 by this script. The IPv6 router 22 is brought into a serviceable state (steps S34 and S35).
[0049]
Then, the IPv6 router 22 uses the automatic notification function of the router to automatically distribute the prefix portion of the IPv6 address assigned to the user to the terminal 3 (Steps S36 and S37).
[0050]
The terminal 3 creates an interface identifier 72 of the lower 64 bits of the IPv6 address from the MAC address of the terminal 3 using a function of RA (Router Advertisement), and creates the entire IPv6 address together with the prefix portion 71 ( Step S38).
[0051]
The operation of the network system 11 when the user starts the communication service after the user has applied for the communication service will be described with reference to FIG.
[0052]
First, when a user receives a communication service, a sign-up request is made to the network system 11 via the IPv6 network 10 (step S41). Upon receiving the sign-up request, the customer management server 15 determines the source address from the communication packet from the terminal 3 (Steps S42 and S43).
[0053]
Then, the line is specified by referring to the customer DB 16 based on the prefix part 71 of the transmission source address (step S45). As a result, since the user at the connection destination can be specified, the communication service is started (step S46).
[0054]
Therefore, the service provider Ai can identify the line from the prefix portion of the IPv6 address used by the user terminal 3, so that the charge management can be performed for each line. In addition, since the address of the terminal 3 of the user is automatically set by the automatic distribution by the IPv6 router 22 and the RA function of the terminal 3, the user is free from the trouble of the address setting work and can easily receive the service. Can be.
[0055]
As for customer management, there are customers who share one line with a plurality of terminals, and there is a case where it is desired to manage each terminal rather than each line. Therefore, as shown in FIG. The information may be managed in association with the address and the terminal name. In such a case, if the IPv6 address is registered in the customer DB 16 in advance and the entire IPv6 address is extracted as the source address in step S43 described above, the service provider can identify the terminal 3 from the IPv6 address. Since it is possible, charging management and use services can be set for each terminal.
[0056]
Next, a case where a terminal name is registered in the customer management server 15 will be described. In this configuration, the customer management server 15 has a terminal name registration function for performing P2P (Peer to Peer) communication between users in the IPv6 network 10.
[0057]
As shown in FIG. 11, when a user registers a terminal name, the user registers his / her own terminal name from a terminal name registration screen prepared by the customer management server 15 (step S51). As a result, the terminal name is registered in the customer DB 16, and the terminal name and the address are also registered in the DNS server 12 (step S52).
[0058]
Therefore, a person who performs P2P user-to-user communication (terminal-to-terminal communication using a DNS server) registers the terminal name in the customer management server 15 in advance, and the terminal name is also reflected in the DNS server 12, so that the IPv6 network can be used. At 10, P2P inter-user communication can be facilitated.
[0059]
Therefore, according to the present embodiment, in addition to the effect of the first embodiment, the service provider can automatically start the service provision without making the customer troublesome terminal setting work. In addition, customer management can be performed according to the needs of customers and service providers such as lines or terminals.
[0060]
Although the embodiments of the present invention have been described above, various modifications and changes can be made to the embodiments of the present invention without departing from the spirit of the present invention. For example, the network branching device 2 according to the present embodiment is configured as shown in FIG. 1 in order to prevent a decrease in the transfer rate of a communication packet. However, the configuration is not limited to this, and as shown in FIG. Alternatively, a configuration using a dual stack router 24 using both the Internet Protocol 21 and the IPv4 / IPv6 protocol may be adopted.
[0061]
The service users who use the network system and the network branching device according to the present embodiment may be not only individual users but also corporate users. In such a case, the present invention can be used as a communication infrastructure of a company intranet system.
[0062]
【The invention's effect】
As described above, according to the present invention, in a network in which the IPv4 network as the Internet network and the IPv6 network as the closed network are used together, the network branch function and the coordination function of the DNS server are provided, thereby burdening the user. Since the two networks can be seamlessly linked to each other without calling, the user can easily enjoy the service of large-capacity data communication while maintaining the environment for connecting to the Internet of the IPv4 protocol.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram illustrating a network system and a network branching device according to a first embodiment of the present invention.
FIG. 2 is a diagram illustrating a communication method of the network system according to the first embodiment of the present invention.
FIG. 3 is a flowchart showing an operation of the switching hub configuring the network branching device according to the first embodiment of the present invention.
FIG. 4 is a flowchart illustrating an operation of a router configuring the network branching device according to the first embodiment of the present invention.
FIG. 5 is a schematic configuration diagram illustrating a network system and a network branching device according to a second embodiment of the present invention.
FIG. 6 is a diagram illustrating a customer database of a network system according to a second embodiment of the present invention.
FIG. 7 is a diagram illustrating a configuration of an IPv6 address.
FIG. 8 is a diagram for explaining exchange when applying for a communication service in the network system according to the second embodiment of the present invention.
FIG. 9 is a diagram illustrating an exchange at the time of signing up for a communication service in the network system according to the second embodiment of the present invention.
FIG. 10 is a diagram illustrating a customer database managed for each terminal of the network system according to the second embodiment of the present invention.
FIG. 11 is a diagram illustrating an exchange when registering a terminal name in the network system according to the second embodiment of the present invention.
FIG. 12 is a diagram illustrating a configuration of another network branching device of the present invention.
FIG. 13 is a network configuration diagram when a conventional Internet network and an IPv4 closed network are used together.
FIG. 14 is a network configuration diagram when a conventional IPv6 Internet network is used.
[Explanation of symbols]
1,11 Network system
2 Network branching device
3 Terminal with mixed IPv4 / IPv6 function
4 IPv4 network
6,7 terminal
8,61 IPv4 / IPv6 tunnel device
10 IPv6 network
12 DNS server (an example of a second DNS server)
13 Application server (an example of a service providing device)
14,17,18 router
15 Customer management server (example of customer management device)
16 Customer Management DB (Example of Customer Information Storage Unit)
21 Switching hub
22 IPv6 router (an example of a second router)
23 IPv4 router (example of first router)
24 Router with Mixed IPv4 / IPv6 Function
40 Sorting device
41 Regional IP Network
42i ISP network
43 Internet Network
44i network terminator (router)
45n DNS server (an example of a first DNS server)
46n, 47, 48n router
50 IPv4 closed network
52 Network termination device (router)

Claims (6)

A first DNS server and a first router supporting the IPv4 protocol, and communicating with the IPv4 network connected to the Internet via the first router and the switching hub by using the IPv4 protocol and the IPv6 protocol. A network system of a closed network of an IPv6 protocol that communicates with a communicable user terminal via the switching hub,
A second DNS server connected to the first DNS server;
A second router connected to the switching hub and corresponding to an IPv6 address;
When the previous user terminal communicates with a communication partner having a desired IPv6 address, the second DNS server resolves the IPv6 address of the communication partner by communication via the first DNS server. A network system configured to communicate with a desired communication partner via the switching hub and the second router based on the resolved IPv6 address. A customer management device for managing customers of communication services provided using the closed network of the IPv6 protocol;
A service providing device for providing a communication service to the user terminal of the customer;
The network system according to claim 1, comprising: The customer management device,
Customer information registering means for registering customer information relating to a customer in a customer information storage unit in association with a line and an IPv6 network address to be assigned to the customer when applying for service from the customer;
Router setting means for setting the second router so as to assign the IPv6 network address for each line,
A line management unit for performing line authentication by referring to the customer information corresponding to the IPv6 network address included in the transmission information from the user terminal when connecting a service from the customer;
Has,
The second router,
Automatic distribution means for automatically distributing the IPv6 network address assigned by the router setting means to the user terminal of the customer;
The network system according to claim 2, comprising: The customer management device,
Second customer information registration means for registering the IPv6 address transmitted from the user terminal in the customer information storage unit in association with customer information;
A terminal management unit for performing terminal authentication by referring to the customer information corresponding to the IPv6 address included in transmission information from the user terminal when connecting a service from the customer;
4. The network system according to claim 3, comprising: The customer management device,
5. A terminal name management unit that receives a user terminal name transmitted from the user terminal, registers the user terminal name in the customer information storage unit, and registers the user terminal name in the second DNS server. Network system as described. A user terminal that can communicate with the Ipv4 protocol and the Ipv6 protocol,
An IPv4 network, which is an Internet network of an IPv4 protocol including a first DNS server, and a closed network of an IPv6 protocol, including a second DNS server, wherein the first DNS server and the second DNS server are connected to each other. A connected IPv6 network;
A network branching device for communication,
A first router connected to the IPv4 network and supporting the IPv4 protocol;
A second router connected to the IPv6 network and supporting the IPv6 protocol;
A switching hub for connecting the first router and the second router to the user terminal, respectively;
A network branching device comprising:

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