JP2003037618A - Data transfer method and router device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce possibility for transfer data to be diverted by providing a data transfer method, with which a desired transmission route can be selected as a transmission route in the case of transfer, and a router device for providing such a data transfer method. SOLUTION: In the data transfer method for a network constituted by connecting a plurality of local area networks, with which one or more router devices and terminal equipment are connected through a communication line, through the router device, a transmission route can be selected by a transmitter out of a plurality of transmission routes determined based on the peculiar address information of terminal equipment as a data transfer source and the peculiar address information of terminal equipment as a data transfer destination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer method in a network in which a plurality of local area networks in which a plurality of terminal devices are connected via communication lines are connected via a repeater.

[0002]

2. Description of the Related Art In recent years, with the development of communication technology, a large network including a large number of local area networks has been constructed, which are connected by public lines or dedicated lines via relays called routers of a plurality of local area networks It is supposed to be done.

FIG. 1 shows an example of the configuration of a conventional network in which six local area networks LAN are connected via a router R. In FIG. 1, each local area network LA
One router R and a plurality of terminal devices PC such as personal computers are connected to N, and the routers R are connected to each other by, for example, a telephone line to connect between local area networks. It is also possible to configure a network in which a plurality of routers R are connected to one local area network LAN.

In such a network, when communication is performed between terminals connected to different local area networks LAN, there are a plurality of transmission routes from the transfer source terminal apparatus to the transfer destination terminal apparatus. For example, when data is transferred from the terminal device PC1 connected to the local area network LAN1 to the terminal device PC6 connected to the local area network LAN6, the transmission path is R1 → R2 →
R3 → R6, R1 → R2 → R4 → R5 → R6, R1
→ R5 → R4 → R2 → R3 → R6, R1 → R5 → R6
There are four ways.

In the past, a route having the smallest number of routers that had to be traversed before reaching the local area network LAN to which the transfer destination terminal device was connected was selected as the transmission route. That is, when data is transferred from the terminal device PC1 to the terminal device PC6, the transmission route R
1 → R5 → R6 was selected.

Here, when selecting a transmission route, information about a transmission route to another local area network LAN (for example, a number for identifying a transfer destination local area network or a transfer destination local area network is reached). A table (hereinafter, referred to as a routing table) that summarizes the number of routers that must be passed up to is used. The routing table is held for each router R or terminal device PC connected to the LAN.

In general, when the number of routers passing through is small, the time required for data transfer is often short, so that the transmission route is conventionally determined by the method described above. However, depending on the transfer speed of the connected line or the local area network that passes through, the transfer time may not be shortened even if the number of routers passing through is small.

Therefore, in a network in which a plurality of local area networks are connected via a router, when there are a plurality of transmission routes, the optimum transmission route should be selected in consideration of the actual communication state of the network. The technology which was done is proposed.

For example, Japanese Unexamined Patent Publication No. 2000-101625 proposes an optimum route selection system which actually transfers data through all transmission routes and establishes the route with the shortest transfer time as the transmission route.

Further, for example, in JP-A-7-221778 and JP-A-7-221779, the transfer time to each local area network is investigated by a router, and the transmission path having the shortest transfer time is set in advance as a table. A technique is disclosed in which the transfer time is minimized by storing the data and reading the transmission path from the table to determine the path when transferring the data.

As a technique related to a router, Japanese Patent Laid-Open No. 11-112570 discloses an Internet service provider (ISP: Internet) which differs for each terminal device.
A router that enables connection to the Internet via a service provider) is disclosed.

Further, in Japanese Patent Laid-Open No. 2000-78199, in a network having a plurality of transmission routes connecting local area networks, when a failure occurs in the main route, a sub route is automatically selected and data is selected. There is disclosed a router adapted to transfer a packet.

By adding a specific function to the router as in the above-mentioned technique, optimum data transfer is realized in a network in which a plurality of local area networks are connected.

[0014]

However, when the transmission path is determined and the data is transferred by the above-described method, the transfer data is arbitrarily taken in by the terminal device connected to the local area network on the transmission path, and There is a potential security issue that data can be misused. In addition, LA that may leak information and be diverted
Even if the N network or the router can be specified, the above-mentioned method cannot automatically avoid the router that is inappropriate as the transmission path because the transmission path is automatically determined so as to minimize the transfer time.

As described above, in the conventional data transfer method, the router automatically determines the transmission route regardless of the user's intention not to pass through the specific local area network or the router when transferring the data. Therefore, there is a drawback that it is not possible to effectively avoid it while recognizing the possibility that information may be leaked.

Therefore, the present invention provides a data transfer method capable of selecting a desired transmission path as a transmission path for transfer, and a router device for realizing the data transfer method, and transfer data can be diverted. The purpose is to reduce the sex.

[0017]

The present invention has been made in order to achieve the above-mentioned object, and a plurality of local area networks in which at least one or more router devices and terminal devices are connected via a communication line. In a data transfer method in a network connected via the router device, a plurality of transmission paths determined based on unique address information of a data transfer source terminal device and data transfer destination terminal device The transmission path can be selected by the sender from among the above. As a result, for example, when a LAN network or router in which information may be leaked and diverted can be specified, the sender can transfer the data through a desired transmission path, thus improving the safety regarding data transfer. be able to.

Specifically, the identification information indicating whether or not the transmission path is set by the sender and, if set, the transmission path information is set in the data to be transferred, and the identification information is set. If it is determined that the transmission route is set by, the data is transferred according to the set transmission route, and if it is determined that the transmission route is not set by the identification information, the transmission route is automatically set. Set to transfer data.

Further, the plurality of transmission paths are automatically extracted based on the unique address information of the terminal device of the data transfer source and the unique address information of the terminal device of the data transfer destination, so that the user can easily perform the desired transmission. The route can be determined.

Further, the plurality of transmission paths are narrowed down and extracted based on a specific condition such as prohibited router information which is prohibited from passing at the time of data transfer.
Even in a large-scale network, the user can specify a desired transmission path relatively easily.

Identification information recognizing means for recognizing identification information indicating whether or not the transmission route set in the data to be transferred is set by the sender, and the transmission route if the transmission route is set. A router device having a transmission route information recognizing unit for recognizing information, and a transfer control unit for controlling data transfer based on a recognition result by the identification information recognizing unit and the transmission route information recognizing unit,
Data transfer can be realized by the method described above.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of a network.
Six local area networks LAN are connected via the router R. In the network of FIG. 1, the local area networks LAN1 to LAN6 are owned and managed by individual organizations.

The terminal devices PC1 to PC6 are terminal devices such as personal computers and servers connected to the respective local area networks LAN1 to LAN6. The routers R1 to R6 form a part of each local area network LAN, and the local area network LAN including the own device is included.
And another local area network LAN are connected to enable IP packet data transfer.

In this embodiment, one router R is arranged for one local area network LAN for simplification, but the connection between the local area networks LAN in the actual Internet is more complicated. Therefore, a plurality of routers may be arranged for one local area network LAN.

When data is transferred between terminal devices connected to different local area networks LAN in such a network, there are a plurality of transmission paths from the transfer source terminal device to the transfer destination terminal device. For example,
Terminal device PC1 connected to the local area network LAN1
From the terminal device P connected to the local area network LAN6
When transferring data to C6, local area network LAN
The transmission path from the router R1 of No. 1 to the router R6 of the local area network LAN6 is R1 → R2 → R3 → R.
6, R1 → R2 → R4 → R5 → R6, R1 → R5 →
There are four possible ways of R4 → R2 → R3 → R6 and R1 → R5 → R6.

Conventionally, a router automatically selects a route having the shortest transfer time from these four routes and sets it as a transmission route for data transfer.

On the other hand, in the present embodiment, by allowing the sender to manually set the transmission route, a route excluding the local area network LAN and the router R which are not desired to be passed when transferring data is set. Can be set as a transmission path.

FIG. 2 shows an example of the structure of an IP packet used for data transfer. The IP packet P includes the IP address 10 of the transfer source terminal device and the IP address of the transfer destination terminal device.
It is composed of an address 20, a special port 30 for identifying the method of setting the transmission path, a router IP address list 40 in which the IP addresses of the routers to pass through are stored, and data 50 to be transferred.

For example, when the user manually sets the transmission route, "1" is written as identification information in the special port 30 before transmitting the data, and the transmission manually set in the router IP address list 40 is performed. The IP address of each router that passes through is written based on the route. And
Each passing router transfers data to the next router according to the IP address of the router stored in advance in the router IP address list 40. As a result, it is possible to intentionally exclude routers that do not want to pass through when transferring data, and thus it is possible to improve the safety of data transfer.

In the present embodiment, the data transfer application program stored in the storage device of each terminal PC is executed to set the transmission path during data transfer. FIG. 3 is a flowchart showing a procedure for generating the transfer packet P by the data transfer program. As an example, a case where data is transferred from the terminal PC1 in FIG. 1 to the terminal PC6 will be described.

First, the IP addresses of the transfer source terminal device PC1 and the transfer destination terminal device PC6 are set (step S).
1).

Next, all the transmission paths capable of transferring data are displayed according to the set IP addresses of the transfer source and transfer destination terminal devices (step S2). For example, as shown in FIG. 1, a network network that allows a visual image of the actual network is displayed. Alternatively, it may be displayed as shown in FIG. 4 by using the code of the routed router. Further, if the transfer time and the like are simultaneously displayed for each transmission route, it can be used as a reference when determining the transmission route.

Next, it is selected whether the transmission path is set manually or automatically (step S30). If it is set automatically, the process proceeds to step S40, and if it is manually set, the process proceeds to step S50.

When automatic setting is selected in step S30, the special port 3 in the IP packet P of FIG. 2 is selected.
"0" is written in 0 (step S40). Then, in step S80, the transfer data is written and the packet P is generated.

On the other hand, when the manual setting is selected in step S30, the special port 3 in the IP packet P is selected.
"1" is written in 0 (step S50). Then, when the transmission route is manually determined based on the transmission route diagram of FIG. 1 or the routed router table of FIG. 4, the IP address of each routed router is written in the router IP address list 40 based on it (step S70). ). For example, I
When the user does not want to go through the router R4 and the router R5 when transferring the P packet P, the user may specify the route of R1 → R2 → R3 → R6 as the transmission route. Then, in step S80, the transfer data is written and the packet P is generated.

As described above, in this embodiment, the transmission path of the IP packet P can be arbitrarily set by the user and the local area network or the router which is not desired to be passed can be eliminated, so that the reliability of data transfer is improved. be able to.

The IP packet P generated according to the flowchart of FIG. 3 is transferred to the router R1 and
Performs the transfer process of the IP packet P according to the identification information written in the special port.

Special port 30 with automatic transmission path setting
In the case of the IP packet P in which "0" is written in, the transmission route is determined by the same method as the conventional one. Specifically, the router R1 collects information such as the number of passing routers and the communication speed in each local net network, and selects, for example, a target transmission path that minimizes the transfer time to the transfer destination terminal PC6. Write the IP address of the routed router to the router IP address list 40. Then, the other transit routers transfer the data to the next router according to the information written in the router IP address list 40.

On the other hand, in the case of the IP packet P in which the transmission path is manually set and "0" is set in the special port 30,
The router R1 recognizes that the transmission route has already been determined by "0" of the special port 30 and sends an I packet to the next router according to the set IP address list 40.
Forward P packet. Then, the other routers also transfer the IP packet P to the next router according to the manually set IP address list 40.

Further, in the case of manually setting the transmission path, it is possible to set the special port to "1" in step S50 and then perform the narrowing down processing as the setting means of the transmission path (step S60). For example, it is possible to display only candidate transmission routes by focusing on routes that do not include a specific router or routes whose transfer time is within a predetermined time. As a result, even in the case of a large-scale network, the user can specify the desired transmission path relatively easily.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments. For example, the transmission route can be more efficiently determined by inputting the information for narrowing down the transmission route in advance. Further, it is also possible to semi-automatically set the transmission route by setting the route having the shortest transfer time among the narrowed transmission routes as the transmission route.

[0043]

According to the present invention, a plurality of local area networks in which at least one router device and a terminal device are connected via a communication line are connected to each other via the router device. In the data transfer method, since it is possible to arbitrarily select a transmission path from a plurality of transmission paths determined based on the IP address information of the terminal device of the data transfer source and the IP address information of the terminal device of the data transfer destination, For example, when a LAN network or router that may leak and divert information can be identified, the user can transfer data through a desired transmission path, and the reliability of data transfer can be improved. Play.

[Brief description of drawings]

1] Six local area networks L through routers R
1 is a configuration example of a network to which an AN is connected.

FIG. 2 is an example of a packet structure used for data transfer.

FIG. 3 is a flowchart showing a procedure for generating a transfer packet P by a data transfer program.

FIG. 4 is a display example of a data transmission route using a code of a router to be passed.

[Explanation of symbols]

10 IP address of transfer source terminal device 20 IP address of transfer destination terminal device 30 special ports 40 router IP address list 50 data P IP packet LAN local area network PC terminal R router device

Claims (7)

[Claims] 1. A data transfer method in a network in which a plurality of local area networks in which at least one router device and a terminal device are connected via a communication line are connected via the router device, Automatically extract multiple transmission routes based on the unique address information of the transfer source terminal device and the unique address information of the data transfer destination terminal device, and prohibit passing through the multiple transmission routes during data transfer The sender can select a transmission route from the extracted transmission routes based on the forbidden router information, and whether or not the transmission route is set by the sender is included in the transferred data. Identification information indicating the transmission path information, if set, is set, and it is determined that the transmission path is set by the identification information. When it is determined that the transmission path is set, the data is transferred, and when it is determined that the transmission path is not set by the identification information, the transmission path is automatically set and the data is transferred. And data transfer method. 2. A data transfer method in a network in which a plurality of local area networks each having at least one router device and a terminal device connected via a communication line are connected to each other via the router device. The transmission path can be selected by the sender from a plurality of transmission paths determined based on the unique address information of the terminal device of the data transfer source and the unique address information of the terminal device of the data transfer destination. Data transfer method. 3. Transfer data is provided with identification information indicating whether or not a transmission path is set by a sender and, if set, the transmission path information, and the transmission path is set according to the identification information. If it is determined that the transmission route is set, the data is transferred according to the set transmission route, and if it is determined that the transmission route is not set by the identification information, the transmission route is automatically set. The data transfer method according to claim 2, wherein data is transferred. 4. The method according to claim 2, wherein the plurality of transmission paths are automatically extracted based on the unique address information of the terminal device of the data transfer source and the unique address information of the terminal device of the data transfer destination. Item 3. The data transfer method according to Item 3. 5. The data transfer method according to claim 2, wherein the plurality of transmission paths are narrowed down and extracted based on a specific condition. 6. The data transfer method according to claim 5, wherein the specific condition is forbidden router information that is prohibited from passing through during data transfer. 7. A router device that is connected to a local area network and enables data transfer between different local area networks, and determines whether or not a transmission route is set in the data to be transferred and is set by a sender. Identification information recognition means for recognizing the identification information, transmission path information recognition means for recognizing the transmission path information when the transmission path is set, and recognition results by the identification information recognition means and the transmission path information recognition means And a transfer control means for controlling data transfer based on the above, wherein the transfer control means, when it is determined that the transmission path is set by the identification information recognizing means, transfers the data according to the set transmission path. If the identification information recognizing means determines that the transmission path is not set, the transmission path is automatically set and the data is transferred. Router device according to claim Rukoto.