JP7253016B1 - NETWORK RELAY DEVICE AND CONNECTION ROUTE SELECTION METHOD - Google Patents

Abstract

Kind Code: A1 A network relay device is provided that can connect to the IPv4 Internet using IPv4 over IPv6, which is usually faster, and can connect to the IPv4 Internet using PPPoE connection for communication from a communication terminal device in which a failure occurs in IPv4 over IPv6. A PPPoE connection unit that connects to the IPv4 Internet via a PPPoE server; an IPv4overIPv6 connection unit that connects to a first router via an IPv4overIPv6 tunnel and connects to the IPv4 Internet via the first router; a connection route selection unit that determines a connection route to the IPv4 Internet, wherein the connection route selection unit selects the connection route by PBR (Policy Based Routing). [Selection drawing] Fig. 1

Description

The present invention relates to a network relay device that relays between an IPv4 communication terminal device and the IPv4 Internet, and a method for selecting a connection route of the network relay device.

In an IPv4/IPv6 mixed network environment, the following patents have been filed for a network relay device connected to an IPv4 communication terminal device.

Patent Document 1 (Japanese Patent Application Laid-Open No. 2015-164287) discloses a device and method for easily setting an appropriate operation mode for relaying IPv4 packets.
The network relay device described in Patent Document 1 operates in one of a first operation mode in which it operates as a router function section and a second operation mode in which it operates as a bridge function section. a packet relay processing unit that relays IP packets; an operation mode setting unit that selectively sets the operation mode of the packet relay processing unit to either a first operation mode or a second operation mode; A tunneling processing unit that terminates an IPv4 over IPv6 tunnel, and a communication test unit that performs a communication test through the tunnel between another network relay device different from the network relay device that terminates the tunnel, and sets an operation mode. If communication is possible as a result of the communication test, the unit sets the operation mode of the packet relay processing unit to the first operation mode.

Patent Document 2 (Japanese Patent No. 6532975) discloses a connection service based on IPv4 over IPv6, which can be expanded with less load.

The connection service described in Patent Document 2 includes a shared IP network connection control device provided in a shared IP network configured with IPv6 and managed by a telecommunications carrier, and a service provided in an ISP network managed by the connection carrier. a gateway relay router provided at the end of the ISP network 3 on the shared IP network 2 side; and customer premises equipment provided at the end of the user network on the shared IP network side. The facility is relayed to the shared IP network connection control device and assigned an IPv4 address from the operator connection control device, tunneling is performed between the customer premises equipment and the gateway relay router using IPv6 capsules, and the distribution of the connection operator is terminated. It shall be performed by a shared IP network connection controller that is not

Patent Document 3 (Japanese Unexamined Patent Application Publication No. 2004-007412) describes a gateway device compatible with PPPoE and a control method thereof, in which a connected terminal selects a protocol to be used between PPPoE and IPoE, PPPoE sessions simultaneously selected.

The gateway device described in Patent Document 3 is provided with an IPoE/PPPoE forwarding table in which network addresses, protocol types, destination IP addresses used in IPoE, and search indexes of PPPoE sessions used in PPPoE are registered, and an input frame is stored in the forwarding table. A protocol type is selected according to the network address on the IPoE/PPPoE forwarding table that matches the destination IP address included in the IP packet header information, and when the selected protocol type is PPPoE, a search corresponding to the network address is performed. The selection of PPPoE sessions from the index is also described.

JP 2015-164287 A Japanese Patent No. 6532975 Japanese Patent Application Laid-Open No. 2004-007412

At present, general households can connect to the IPv4 Internet using IPv4 or IPv4 over IPv6 by making a contract with an ISP (Internet Service Provider). IPv4 over IPv6 is a method of building an IPv6 tunnel between a home network relay device and a BR (Border Relay) installed in a VNE (Virtual Network Enabler) network, and connecting to the IPv4 Internet through the VNE.
Of these, when connecting to the IPv4 Internet using the PPPoE method, which is the conventional connection method, the network terminal equipment of the ISP is passed through. and communication speed may be slow.

On the other hand, when connecting to the IPv4 Internet using IPv4 over IPv6, the communication speed can be expected to be faster than when connecting to the IPv4 Internet using the PPPoE method. However, there are problems such as the limited number of port numbers that can be used and the inability to use a fixed IP address when connecting to a home communication terminal device. Specifically, there are problems with some online games, servers cannot be installed, some network cameras cannot be accessed from outside the camera installed at home, VPN by PPTP or L2TP/IPsec cannot be used, etc. failure has been confirmed.
In particular, in a network environment where communication terminal devices that fail in IPv4overIPv6 communication and communication terminal devices that do not cause failure coexist, two routers, one for IPv4overIPv6 connection and the other for PPPoE connection, are installed. A complicated network configuration was required, such as setting a router for IPv4 over IPv6 connection as a PPPoE bridge and allocating terminals connected to each router.

The network relay device described in Patent Document 1 includes a packet relay processing unit that relays IPv4 packets, a tunneling processing unit that terminates an IPv4overIPv6 tunnel, and a communication test unit that performs a communication test via the IPv4overIPv6 tunnel. Select the operation mode according to the result of Therefore, it is possible to connect to the IPv4 Internet using the PPPoE method, and it is also possible to connect to the IPv4 Internet using IPv4 over IPv6.
However, the communication test described in Patent Document 1 is a test for determining which of the first to fourth connection modes the network connection mode in which the network relay device is installed is. Once the scheme is determined, it is not assumed to change the connection scheme during use.
Therefore, the user of the network relay device described in Patent Document 1 should connect to the IPv4 Internet using the PPPoE method, with the expectation that the communication speed may be slowed down. You have to choose between connecting to the IPv4 Internet with IPv4 over IPv6, giving up obstacles such as being unable to install a server, and some network cameras being unable to access the camera installed at home from the outside. .

The invention described in Patent Document 2 is an invention related to a communication method when connecting to an IPv4 network operator in an IPv6 access network. However, it does not describe connection to the IPv4 Internet using the conventional PPPoE system.

The invention described in Patent Document 3 is an invention of a gateway device compatible with both IPoE and PPPoE, which is used to realize mutual communication between a network built in a company and an external network. It does not specifically describe how to decide whether to connect to the Internet using PPPoE or IPoE. Moreover, Patent Document 3 does not describe IPv4 over IPv6 either.

A main object of the present invention is to provide a network relay device that can easily connect to the Internet even in a network environment where communication terminal devices that fail in IPv4 over IPv6 communication and communication terminal devices that do not cause failure coexist. to do.
A further object of the present invention is to provide a network relay device that relays a communication terminal device having an IPv4 communication interface and the IPv4 Internet. is to provide a network relay device capable of connecting to the IPv4 Internet with a PPPoE connection.
A further object of the present invention is to provide a network relay device that can identify the type of communication from a communication terminal device and connect to the IPv4 Internet by PPPoE connection for the type of communication that causes failures in IPv4 over IPv6. It is in.

(1)
A network relay device according to one aspect is a network relay device that relays a communication terminal device having an IPv4 communication interface and the IPv4 Internet, and includes a PPPoE connection unit that connects to the IPv4 Internet via a PPPoE server and an IPv4 over IPv6 tunnel. an IPv4overIPv6 connection unit for connecting to the IPv4 Internet via the first router, and a connection route selection unit for determining a connection route to the IPv4 Internet, wherein the connection route selection unit is , PBR (Policy Based Routing) to select a connection path.

Normally, communication routing is determined using the destination IP address and a routing table. However, if there are two types of routing paths for connecting to the IPv4 Internet, routing via a PPPoE server and routing via an IPv4 over IPv6 tunnel, it is not possible to decide which routing to select based on the destination IP address. Can not.
However, the network relay device recognizes the IP address and MAC address of the transmission source, and determines whether the communication is from a communication terminal device that causes a failure in IPv4 over IPv6 based on the IP address and/or MAC address of the transmission source. can judge. Normally, routing via IPv4overIPv6 tunnel is used, and in the case of communication from a communication terminal device that causes a failure in IPv4overIPv6, by connecting to the IPv4 Internet via a PPPoE server, high speed and failure management can be achieved. It is possible to realize a network relay device that does not generate
Moreover, even when communication terminal devices that fail in IPv4 over IPv6 communication and communication terminal devices that do not cause failure coexist, router settings may be changed for each communication terminal device, or multiple routers may be used. You can easily connect to the Internet without the need to build a special network.
Note that PBR (Policy Based Routing) in the present invention does not determine the forwarding destination based only on the destination IP address as in normal IP routing, but rather uses various other information to route packets (unique). Cast) is a function that controls the routing.

(2)
In the network relay device according to one aspect of the network relay device according to the second invention, in PBR, the connection path may be selected by the MAC address or SSID of the transmission source communication terminal device.

As information that can be used in PBR, for example, source IP address and source MAC address are candidates. However, the IP address of the same communication terminal device may change due to reconnection of the communication terminal device or the like. Therefore, when selecting a connection route using the IP address of the communication terminal device of the transmission source, it is necessary to assign a fixed IP by DHCP or manually assign a fixed IP on the client side.
On the other hand, if the MAC address of the transmission source communication terminal device is used to select the connection route, it is only necessary to specify the MAC address unique to the transmission source communication terminal device. It is easy and reliable to specify the communication terminal device to be used.
If a wireless access point is connected to the LAN-side interface of the network relay device, it may be determined whether IPv4overIPv6 connection or PPPoE connection will be used for each SSID (Service Set Identifier) of the wireless access point. be. In such a case, the connection route may be selected by the SSID of the wireless access point instead of the source MAC address.

(3)
A network relay device according to a third aspect of the invention is the network relay device according to the second aspect of the invention, further comprising a correspondence table between MAC addresses and model names of communication terminal devices, wherein the MAC addresses are determined using the correspondence table. A connection route may be selected based on the model name or SSID of the communication terminal device.

When setting the MAC address of a communication terminal device that has a problem with IPv4overIPv6 to a network relay device, the user can specify the communication terminal device that has a problem and enter its MAC address. It is rather difficult for the user of the device to check the MAC address of the communication terminal device in which the failure occurs and input it to the network relay device.
On the other hand, the correspondence between the MAC address and the model name of the communication terminal device is provided by, for example, Internet security software, and the model name can be specified from the MAC address.
Note that the correspondence table between the MAC address and the model name of the communication terminal device may exist on a server that can be connected to the Internet, and the network relay device may access the server with the correspondence table and search.

(4)
A network relay device according to a fourth aspect of the present invention is the network relay device according to the third aspect, further comprising a model-specific route selection table for setting the relationship between the model name or SSID of the communication terminal device and the connection route, The connection route may be selected based on the model name or SSID and the model-specific route selection list.

By providing the model-specific route selection list in the network relay device, when a packet is transmitted from the communication terminal device to the network relay device, the network relay device first identifies the model name from the source MAC address using the correspondence table. Next, the connection route to be selected can be specified from the specified model name or SSID based on the model-specific route selection list.

(5)
A network relay device according to a fifth aspect of the present invention is the network relay device according to the fourth aspect, wherein the correspondence between the model name or SSID and the selected connection path in the model-specific route selection list is determined by the communication terminal device. It may be set by the user.

The user of the communication terminal device often understands whether the corresponding communication terminal should be connected using IPv4 over IPv6 or PPPoE. Also, when a wireless access point is connected to the LAN interface of the network relay device, the user usually understands which connection path should be selected for each SSID of the wireless access point.
In such a case, it is easy and reliable for the user to set the correspondence between the model name or the SSID and the connection path to be selected. If the user sets it, the setting can be changed if a problem occurs during use.
However, for the initial values of the model-specific route selection list, it is desirable that the network relay device sets initial values that are deemed appropriate.
For example, some servers, network cameras, and other communication terminal devices that require a fixed IP address, and communication terminal devices that make VPN connections using PPTP or L2TP/IPsec cannot use certain functions due to the IPoE mechanism. PPPoE may be selected as the default setting.
In this case, the route may be selected for each model using the set initial values, and the user may change the settings when a failure occurs.

(6)
A network relay device according to a sixth aspect of the invention is the network relay device according to the fourth or fifth aspect of the invention, further comprising a communication type identifying unit for identifying the type of communication transmitted from the communication terminal device, A connection route may be selected based on the model name and the type of communication.

For example, when the communication terminal device is a game machine, there are games in which obstacles occur and games in which communication with IPv4 over IPv6 does not cause obstacles in online games, etc., even if the same game machine is used. This is because the types of communication used in online games are different. Therefore, by equipping the network relay device with a communication type identification section that recognizes the type of communication and a list of path selections by communication, it is possible to select a connection function according to the type of game rather than for each game machine. Become.
In terms of the accuracy and speed of connection function selection, when selecting a connection function, first determine whether the model has a possibility of causing a failure depending on the type of communication in the route selection list by model, It is desirable to have the function of recognizing the type of communication only for those models that may cause trouble.

(7)
A network relay device according to a seventh aspect of the invention is the network relay device according to the sixth invention from the first aspect, further comprising an IPv6 connection unit, connected to a communication terminal device having an IPv6 communication interface, and providing an ISP (Internet service provider). ), or via an IPv6 closed network and a network possessed by a VNE (Virtual Network Enabler), it may be connected to the IPv6 Internet.

In the future, it is expected that the number of communication terminal devices equipped with IPv6 communication interfaces will increase, and that the number of users using IPv6 in communication terminal devices equipped with both IPv4 and IPv6 will increase.
Therefore, it is desirable that the network relay device is connected not only to the communication terminal device having the IPv6 communication interface but also to the IPv6 Internet.
In connection with the IPv6 Internet, there is a mode of connection via the IPv6 closed network and the network owned by the VNE, and a mode of direct connection via the second router of the ISP. It is desirable that the network relay device according to the invention can cope with both aspects.

(8)
A network relay device according to an eighth aspect is the network relay device according to one aspect to the seventh aspect, wherein the communication terminal device is at least one of a personal computer, a smartphone, a game machine, a network camera, an IoT appliance, and a network server. The PPPoE connection route may be selected for communication terminal devices that require a fixed IP address and communication terminal devices that perform VPN connection by PPTP or L2TP/IPsec.

The network relay device of the present invention can be used with communication terminal devices such as game machines and network cameras that may cause problems when communicating with IPv4 over IPv6. can be compatible with

(9)
A connection route selection method according to another aspect is a connection route selection method for a network relay device that relays a communication terminal device having an IPv4 communication interface and the IPv4 Internet, wherein the network relay device connects to the IPv4 Internet via a PPPoE server. and an IPv4overIPv6 connection unit connected to the IPv4 Internet via the first router via an IPv4overIPv6 tunnel, wherein the connection route selection method is: a MAC address extraction step of extracting the MAC address of the communication terminal device; a communication terminal device identification step of identifying the model name of the communication terminal device using the MAC address; A connection path determination step for each model for determining whether connection is possible, and a connection path for connecting with IPv4overIPv6 when connection is possible with IPv4overIPv6, and connecting with PPPoE when there is a possibility that a failure may occur in IPv4overIPv6 connection. A selection step.

In a connection path selection method according to another aspect, the MAC address of a communication terminal device of a transmission source is extracted, the type of communication terminal device is specified using a correspondence table between the MAC address and the type of communication terminal device, and the communication terminal device is identified. If it is possible to connect with IPv4 over IPv6, it connects with IPv4 over IPv6, and if there is a possibility of failure in IPv4 over IPv6 connection, it connects to the IPv4 Internet via the PPPoE server without burdening the user. , can connect to the IPv4 Internet without failure.
Note that the correspondence table between MAC addresses and types of communication terminal devices may exist on a server that can be connected to the Internet, and the network relay device may access the server with the correspondence table and search.

(10)
A connection route selection method according to a tenth aspect of the present invention is a connection route selection method according to another aspect, wherein the connection route selection method further comprises a communication type specifying step of specifying a type of communication transmitted from the communication terminal device, The alternative connection path determination step may determine whether IPv4 over IPv6 connection is possible based on the model name of the communication terminal device and the type of communication transmitted from the communication terminal device.

For example, when the communication terminal device is a game machine, there are games in which obstacles occur and games in which communication with IPv4 over IPv6 does not cause obstacles in online games, etc., even if the same game machine is used. This is because the types of communication used in online games are different. Therefore, by recognizing the type of communication in the network relay device and determining whether or not a failure occurs when the communication is IPv4 over IPv6 connection, it is possible to more accurately determine the presence or absence of a failure.
In terms of the accuracy and speed of connection function selection, when selecting a connection function, first, in the model-specific connection route determination process, it is determined whether the model is likely to cause a failure depending on the type of communication, It is desirable to have the function of recognizing the type of communication only for those models that may cause trouble.

1 is a schematic diagram showing the configuration of a network relay device according to a first embodiment; FIG. FIG. 4 is a schematic diagram showing a first network connection mode using the network relay device of the first embodiment; FIG. 5 is a schematic diagram showing a second network connection mode using the network relay device of the first embodiment; FIG. 4 is a schematic diagram showing the flow of connection route selection in the network relay device of the first embodiment; 5 is a table showing an example of a MAC address/device correspondence table 55 in the network relay device of the first embodiment; FIG. 4 is a table showing an example of a model-specific route selection list in the network relay device of the first embodiment; FIG. 5 is a schematic diagram showing the configuration of a network relay device according to the second embodiment; FIG. 10 is a schematic diagram showing the flow of connection route selection in the network relay device of the second embodiment;

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are given to the same parts. Moreover, in the case of the same reference numerals, their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[First embodiment]
FIG. 1 is a schematic diagram showing the configuration of the network relay device 100 of the first embodiment, FIG. 2 is a schematic diagram showing a first network connection mode using the network relay device 100, and FIG. FIG. 4 is a schematic diagram showing a second network connection mode using the device 100; 4 is a schematic diagram showing the flow of connection route selection in the network relay device 100, FIG. 5 is a table showing an example of the MAC address/device correspondence table 55 in the network relay device 100, and FIG. 4 is a table showing an example of a model-specific route selection list 57 in the device 100. FIG.

(Configuration of network relay device 100)
As shown in FIG. 1, the network relay device 100 is composed of a data relay processing section 10, an interface section 30, and a connection path selection section 50. FIG.
The data relay processing unit 10 has a PPPoE connection unit 15 that connects IPv4 packets to the IPv4 Internet 120 via a PPPoE server 130 of an ISP (Internet Service Provider) via a PPPoE connection, and a PPPoE connection unit 15 that transmits IPv4 packets via an IPv4 over IPv6 tunnel 140. , an IPv4overIPv6 connection unit 20 that connects to the IPv4 Internet 120 via the ISP's first router 150, and an IPv6 connection unit 25 that connects IPv6 packets to the IPv6 Internet 160 via the ISP's second router 170. . The IPv4overIPv6 connection unit 20 and the IPv6 connection unit 25 may connect to the IPv4 Internet 120 and the IPv6 Internet 160 via the IPv6 closed network 180 and VNE (Virtual Network Enabler) 190, respectively.

In this embodiment, the data relay processing unit 10, the interface unit 30, and the connection route selection unit 50 of the network relay device 100 are configured as separate pieces of hardware. ) or ASIC (Application Specific Integrated Circuit) may realize at least part of the functions of the network relay device 100 .

The interface unit 30 includes a WAN side I/F 35 that connects with the PPPoE server 130, the first router 150, the second router 170, etc., and communication terminal devices such as personal computers, smartphones, game machines, network cameras, and network servers. 110 and a LAN side I/F (interface) 40 connected thereto.
Communication terminal device 110 includes at least one of a personal computer, a smart phone, a game machine, a network camera, an IoT appliance, and a network server. A communication terminal device 110 that requires a fixed IP address and a communication terminal device 110 that performs a VPN connection by PPTP or L2TP/IPsec need to select a PPPoE connection path.
Normally, the selection of the connection route in the network relay device 100 is performed based on the IP address of the destination. However, the selection of the connection path between the PPPoE connection path and the IPv4overIPv6 connection path cannot be performed by the destination IP address. Therefore, the connection path selection unit 50 selects the connection path based on the source information by PBR (Policy Based Routing).

Specifically, information such as the IP address and MAC address of the IPv4 data transmitted from the communication terminal device 110 is extracted, and whether the IPv4 data is transmitted via the PPPoE connection path or the IPv4overIPv6 connection path is determined. , a MAC address/device correspondence table 55 for specifying the model name of the communication terminal device 110 based on the MAC address, and the relationship between the model name or SSID of the communication terminal device 110 and the connection path and a model-specific route selection list 57 for setting .

(First network connection mode)
FIG. 2 shows a first network connection mode using the network relay device 100. As shown in FIG.
A communication terminal device 110 with an IPv4 communication interface and/or a communication terminal device 110 with an IPv6 communication interface are connected to the LAN side of the network relay device 100 . Note that the communication terminal device 110 has both an IPv4 communication interface and an IPv6 communication interface, and may perform IPv4 communication or IPv6 communication as necessary.

The WAN side of the network relay device 100 includes an IPv4 connection path connected to the PPPoE server 130 of the ISP, an IPv4 over IPv6 connection path connected to the first router 150 of the ISP, and a second router 170 of the ISP. An IPv6 connection path is connected. An IPv4 over IPv6 tunnel 140 is provided between the network relay device 100 and the first router 150 and terminated at the network relay device 100 and the first router 150 . Terminating a tunnel means encapsulating an IPv4 packet into an IPv6 packet and extracting the IPv4 packet from the IPv6 packet.
Also, the PPPoE server 130 and the first router 150 are connected to the IPv4 Internet 120 and the second router 170 is connected to the IPv6 Internet 160 .
The network relay device 100 selects one connection section of the data relay processing section 10 according to the judgment of the connection path selection section 50, and connects the IPv4 Internet 120 or the IPv6 Internet 120 via the connection path corresponding to the selected connection section. Send data to Internet 160 .

(Second network connection mode)
FIG. 3 shows a second network connection mode using the network relay device 100. As shown in FIG.
In the second connection mode, the IPv4 connection path connected to the PPPoE server 130 is the same as in the first connection mode, but the IPv4 over IPv6 connection path and the IPv6 connection path are IPv6 closed network 180 and VNE 190 such as NTT's FLET'S network. The difference is that it is connected to the Internet via (Virtual Network Enabler).
An IPv4 over IPv6 tunnel 140 is provided between the network relay device 100 and the fourth router 210 and terminated at the network relay device 100 and the fourth router 210 . The third router 200 is an entrance router device of the IPv6 closed network 180 .
The fourth router 210 is a device that terminates the IPv4 over IPv6 tunnel 140 such as AFTR (Address Family Translate Router), and the fifth router 220 is a device that connects IPv4 private addresses such as CGN (Carrier Grade NAT) and IPv4 global addresses. It has a function to perform mutual conversion between
The LAN side connection mode of the network relay device 100 is the same as the first network connection mode.

(Flowchart for connection route selection)
FIG. 4 shows a flow chart of connection route selection in the network relay device 100 of the first embodiment. Each step will be described below.
(S1) Standby until transmission data is received from the communication terminal device 110;
(S2) When receiving transmission data, extract the MAC address of the transmission source.
(S3) Using the extracted MAC address and the MAC address/device correspondence table 55 (see FIG. 5), the model name of the transmission source communication terminal device 110 is specified.
(S4) Referring to the model-specific route selection table 57 (see FIG. 6) that sets the relationship between the model name or SSID of the communication terminal device 110 and the connection route, a failure occurs in the communication terminal device 110 of the transmission source. to see if
(S5) If there is a possibility that the model of the transmission source communication terminal device 110 will fail, the PPPoE connection path is selected. It is desirable to select the PPPoE connection path even when there is a possibility that a failure may occur depending on the type of communication in the model-specific path selection list 57 .
(S6) If no failure occurs in the model of the communication terminal device 110 of the transmission source, an IPv4 over IPv6 connection route with a faster communication speed is selected.
(S7) Data is transmitted to the IPv4 Internet 120 through the selected connection path.

(MAC address/device correspondence table 55)
FIG. 5 shows an example of the MAC address/device correspondence table 55. As shown in FIG. In the MAC address/device correspondence table 55, the vendor and model name of the communication terminal device 110 can be searched for each MAC address.
Note that the MAC address/device correspondence table 55 may exist on a server that can be connected to the Internet, and the network relay device 100 may access the server having the correspondence table and search for it.

(Table 57 for route selection by model)
FIG. 6 shows an example of the model-specific route selection list 57. As shown in FIG. In FIG. 6, whether to connect with IPv4 over IPv6 or with PPPoE is described for each device model name or SSID. Also, if it is necessary to connect with PPPoE depending on the type of communication, that fact is also described.
The model-specific route selection list 57 may also exist on a server that can be connected to the Internet, and the network relay device 100 may access the server with the correspondence table and search for it.

The user of the communication terminal device 110 often understands whether the corresponding communication terminal device 110 should be connected using IPv4 over IPv6 or should be connected using PPPoE. Also, when a wireless access point is connected to the LAN interface 40 of the network relay device 100, the user usually does not understand which connection route should be selected for each SSID of the wireless access point. there is
In such a case, the user can easily decide whether to connect using IPv4overIPv6 or PPPoE, and the decision is reliable. The connection path column of 57 may be filled in by the user. If the user sets it, the setting can be changed if a problem occurs during use.
However, it is preferable that the network relay device 100 automatically sets the initial values of the model-specific route selection list 57 to initial values that are considered appropriate for each model.
For example, some servers, network cameras, and other communication terminal devices that require a fixed IP address, and communication terminal devices that make VPN connections using PPTP or L2TP/IPsec cannot use certain functions due to the IPoE mechanism. PPPoE may be selected as the default setting.

[Second embodiment]
FIG. 7 is a schematic diagram showing the configuration of the network relay device 100a of the second embodiment, and FIG. 8 is a schematic diagram showing the flow of connection route selection in the network relay device 100a of the second embodiment. The network connection mode, MAC address/device correspondence table 55, and model-specific route selection list 57 are the same as those of the network relay device 100 of the first embodiment.

(Configuration of network relay device 100a)
In contrast to the network relay device 100 of the first embodiment, the network relay device 100a of the second embodiment shown in FIG. is added.
For example, when the communication terminal device 110 is a game machine, there are games in which obstacles occur and games in which communication with IPv4 over IPv6 does not cause obstacles in online games, etc., even if the same game machine is used. This is because the types of communication used in online games are different. Therefore, by providing the network relay device 100 with a function of recognizing the type of communication, it is possible to select a connection function according to the type of game rather than for each game machine.

The network relay device 100a of the second embodiment includes a communication type identification unit 65 in the connection path selection unit 50 to recognize the type of communication transmitted from the communication terminal device 110 of the transmission source.
Furthermore, in the case of a game machine, etc., it is determined whether or not the type of recognized communication is a communication that causes a problem, based on the communication route selection table 59 that describes the types of communication that cause a problem when communicating with IPv4 over IPv6. If the communication causes a failure, the PPPoE connection route is selected. In recognizing the type of communication, for example, the TCP/UDP port number, or the TOS (Type of Service) field of the IPv4 header, etc., are used by routers to determine the priority of packets in QoS (Quality of Service) control. Parameters to be used can be referred to.
In terms of accuracy and speed of connection path selection, first, in selecting a connection path, it is determined whether or not the model requires PPPoE connection depending on the type of communication, using the model-specific path selection table 57. However, depending on the type of communication, it is desirable to have the function of recognizing the type of communication only for communication terminal devices 110 that need to be connected by PPPoE.
In addition, when the user selects a route in the model-specific route selection list 57, the route selected by the user may be preferentially connected to the route selected by the communication type identification unit 65. FIG.

(Flowchart for connection route selection)
FIG. 8 shows a flow chart of connection route selection in the network relay device 100a of the second embodiment. The flowchart of FIG. 8 is the same as the flowchart of FIG. 4 except that steps S13-S15 are added to the flowchart of FIG.
In the first embodiment, the PPPoE connection route is selected in the case of a device that causes a failure in IPv4 over IPv6 connection in step S4, but in the second embodiment, it is determined that the device causes a failure in step S4. Also, if the device is a device that causes failures in all communications, it is determined (step S13). For example, a network camera that requires a fixed IP address corresponds to a device that fails in all communications. On the other hand, with network game machines, there are cases where failures do not occur depending on the type of communication, so it is judged that failures do not occur in all communications. Then, in the case of a device in which failure occurs in all communications, the PPPoE connection route is selected (step S5).
If it is determined that the device is not a device that causes failures in all communications, the communication type identification unit 65 identifies the type of communication (step S14).
If the identified communication type is IPv4 over IPv6 communication causing a failure, the PPPoE connection route is selected, otherwise the IPv4 over IPv6 connection route is selected (step S15).

In the present invention, the communication terminal device 110 corresponds to the "communication terminal device", the network relay devices 100 and 100a correspond to the "network relay device", the PPPoE server 130 corresponds to the "PPPoE server", and the IPv4 Internet 120 corresponds to The PPPoE connection unit 15 corresponds to the “PPPoE connection unit”, the IPv4overIPv6 tunnel 140 corresponds to the “IPv4overIPv6 tunnel”, the first router 150 corresponds to the “first router”, The IPv4overIPv6 connection unit 20 corresponds to the "IPv4overIPv6 connection unit", the connection route selection unit 50 corresponds to the "connection route selection unit", the communication type identification unit 65 corresponds to the "communication type identification unit", and the IPv6 connection unit 25 corresponds to the "IPv6 connecting part", the second router 170 corresponds to the "second router", the IPv6 closed network 180 corresponds to the "IPv6 closed network", and the VNE 190 corresponds to the "network owned by the VNE". and the IPv6 Internet 160 corresponds to the "IPv6 Internet".

Although one preferred embodiment of the invention is described above, the invention is not so limited. It is understood that various other embodiments can be made without departing from the spirit and scope of the invention. Furthermore, in this embodiment, the actions and effects of the configuration of the present invention are described, but these actions and effects are examples and do not limit the present invention.

15 PPPoE connection unit 20 IPv4 over IPv6 connection unit 25 IPv6 connection unit 50 connection route selection unit 65 communication type identification unit 100 network relay device 110 communication terminal device 120 IPv4 Internet 130 PPPoE server 140 IPv4 over IPv6 tunnel 150 first router 160 IPv6 Internet 170 second second router 180 IPv6 closed network 190 VNE (Virtual Network Enabler)

Claims (8)

A network relay device for relaying between a communication terminal device having an IPv4 communication interface and the IPv4 Internet,
a PPPoE connection unit that connects to the IPv4 Internet via a PPPoE server;
an IPv4overIPv6 connection unit that connects to a first router via an IPv4overIPv6 tunnel and connects to the IPv4 Internet via the first router;
a connection route selection unit that determines a connection route to the IPv4 Internet,
The connection path selection unit selects the connection path by PBR (Policy Based Routing) ,
In the PBR, the connection path is selected by the MAC address or SSID of the communication terminal device of the transmission source,
further comprising a correspondence table between the MAC address and the model name of the communication terminal device,
A network relay device, wherein the connection path is selected based on the model name or the SSID of the communication terminal device determined from the MAC address using the correspondence table. further comprising a model-specific route selection list for setting the relationship between the model name or the SSID of the communication terminal device and the connection route,
2. The network relay device according to claim 1 , wherein said connection route is selected based on said model name or said SSID and said model-specific route selection list. 3. The network relay device according to claim 2 , wherein the correspondence between said model name or said SSID and said connection path to be selected in said model-specific route selection list is set by a user of said communication terminal device. Furthermore, comprising a communication type identification unit that identifies the type of communication transmitted from the communication terminal device,
4. The network relay device according to claim 2 , wherein said connection path is selected based on said model name and said communication type. further comprising an IPv6 connection unit, connected to the communication terminal device comprising an IPv6 communication interface, via a second router of an ISP (Internet Service Provider), or having an IPv6 closed network and a VNE (Virtual Network Enabler) 5. The network relay device according to claim 1, connected to the IPv6 Internet via a network. The communication terminal device includes at least one of a personal computer, a smartphone, a game machine, a network camera, an IoT home appliance, and a network server,
6. The connection path of said PPPoE is selected for said communication terminal device requiring a fixed IP address and said communication terminal device performing VPN connection by PPTP or L2TP/IPsec. The network relay device according to the item. A connection path selection method for a network relay device relaying between a communication terminal device having an IPv4 communication interface and the IPv4 Internet, comprising:
The network relay device connects to the IPv4 Internet via a PPPoE server, connects to a first router via an IPv4 over IPv6 tunnel, and connects to the IPv4 Internet via the first router. an IPv4 over IPv6 connection;
The connection route selection method includes:
a MAC address extraction step of extracting the MAC address of the transmission source communication terminal device;
a communication terminal identifying step of identifying the model name of the communication terminal using the MAC address;
a model-specific connection path determination step of determining whether IPv4 over IPv6 is connectable to the identified model name;
a connection route selection step of connecting with IPv4 over IPv6 when connection is possible with IPv4 over IPv6, and connecting with PPPoE when there is a possibility of failure occurring in IPv4 over IPv6 connection. The connection route selection method further comprises a communication type identification step of identifying the type of communication transmitted from the communication terminal device,
8. The connection route according to claim 7 , wherein said model-specific connection route determination step determines whether IPv4 over IPv6 connection is possible based on said model name of said communication terminal device and the type of said communication transmitted from said communication terminal device. selection method.

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