JP2016019034A - Data transmission and reception method based on tunneling system, and device employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce circuit scale and a functional burden of a reception-side termination device and to improve throughput of data transmission in data transmission based on a tunneling system over an IP network.SOLUTION: A data transmission and reception method between first and second end nodes on the basis of the tunneling system over an Internet network includes the steps of: dividing a transmission frame received from the first end node into at least two frames by a predetermined fixed length; adding a header indicating divided data to the divided frames; adding an identification header indicating the data transmission based on the tunneling system to the divided frames and then successively sending the frames to a tunnel defined on the Internet network; deleting the identification header indicating the data transmission based on the tunneling system from the frames received via the tunnel and then successively sending the frames to the second end node. The data are reconstructed (reassembled) at the second end node.SELECTED DRAWING: Figure 4

Description

The present invention relates to a method of transmitting and receiving divided packets performed via the Internet network (IP network). More specifically, in the transmission and reception of fragmented packets performed by the tunneling method via the IP network, the fragmented packets emitted from the transmission-side switch device are reconstructed (reassembled) by the reception-side switch device. The present invention relates to a data transmission and reception method characterized by being performed by an end node such as a PC.
The present invention also relates to an apparatus using the above data transmission and reception method.

FIG. 1 is a diagram showing a conventional packet division transmission and reception processing method in the prior art. When data D having a certain capacity or more is transmitted and received between the end nodes E ₁ and E ₂ via the IP network 10, the data D is a packet that can be passed through the IP network 10 at a time in the router device R ₁ on the transmission side. The packet is divided into size packets D ₁ and D ₂ and transmitted to the IP network 10 together with information indicating that the packet is a divided packet.
The router device R ₂ on the receiving side does not reconstruct the divided packets, but only transfers the plurality of packets D ₁ and D ₂ to the end node E ₂ such as a PC. The end node E ₂ reconstructs (reassembles) the plurality of packets transferred from the router apparatus R ₂ as data D in the end node. In the case of this conventional example, a function and load for packet reconstruction are requested from the end node E ₂ such as a PC. The information indicating that the packet is a fragmented packet includes the MF bit of IP (1) and the offset value of IP (2) in the drawing.

  Conventionally, in addition to the method of directly transmitting and receiving data on the IP network 10 shown in FIG. 1, a virtual dedicated line such as a tunnel is created on a public line such as the IP network 10 to transfer data. There is a transmission / reception technology called tunneling that encapsulates the network so that it cannot be seen by general users on public lines. There are various types of tunneling such as PPTP, L2F, L2TP, IPsec, and GRE depending on the layer and protocol. In the present specification, GRE tunneling will be mainly described with reference to the drawings. However, the present invention is not limited to GRE (Generic Routing Encapsulation), but may be other types including those described above. .

FIG. 2 is a conceptual diagram of a conventional GRE tunneling system. To the receiving side switching device B from the transmission side switching device A, the data D is transmitted through the GRE tunnel T, in which the data reaches the end node E _2.

2 first of all it is in the switch device A, GRE header indicating that it is a GRE tunnel communication is added to the data D sent from the end node E _1. Next, the data to which the GRE header is added is divided into a plurality of packets D ₁ and D ₂ having a data length that can pass through the GRE tunnel T at a time. The divided packets are sequentially transmitted from the switch device A toward the GRE tunnel T from the frame including the GRE header.

The plurality of divided data D ₁ and D ₂ sent from the switching device A to the GRE tunnel T are sequentially received by the receiving side switching device B. The switching device B first deletes the GRE header. Then, reconstruction of the data D at the switch apparatus B is performed after the reconstruction, the data D to the end node E ₂ are transferred. In the case of this embodiment, it is necessary that the receiving-side switch device B itself has a restructuring function, and when the reconfiguration is implemented by software, the processing speed There was a problem that was slow. In general, the switch devices A and B are often provided as hardware such as a router. However, if the reconfiguration function is configured in hardware, the hardware circuit scale increases. was there.

FIG. 3 is a conceptual diagram in the case where the switch device, particularly the switch device B on the receiving side does not have a reassembly (reassembly) function. The procedure for sending data from the switching device A to the GRE tunnel T is the same as in FIG. As mentioned above, many switch devices do not have a reassembly function. In this case, the switching device B, only GRE header is removed, since the end node E ₂ in does not reach the information in the header of "split", the data itself is discarded without being reconstituted with end node E ₂ There was a problem to say. The drawing, crosses attached to end nodes E ₂ represents the state of reassembly not at end node E _2.

  Therefore, the present invention has been devised to solve the above-mentioned problems and problems of the prior art, and its main purpose is to perform a reconstruction function in an end node such as a PC in a tunneling transmission system. Thus, the function is not required for the switching device on the receiving side, and the entire configuration is simplified.

  Another object of the present invention is to improve the throughput of data transmission by performing the reconstruction function in an end node such as a PC.

According to one aspect of the invention,
In the data transmission and reception method between the first and second end nodes by the tunneling method via the Internet network, the method includes:
Dividing the transmission frame received from the first end node into at least two frames with a predetermined fixed length;
Adding a header indicating that the data is divided into each divided frame;
Adding a header indicating that it is a tunneling data transmission to each of the divided frames;
Sequentially sending each frame to which the header is added to a tunnel established in the Internet network;
Deleting the header indicating tunneling data transmission from each frame received via the tunnel;
Sequentially sending each frame from which the header has been deleted to the second end node;
The data transmission and reception method is characterized in that data reconstruction (reassembly) is performed in the second end node.

In the above data transmission and reception method, each step is performed between at least two terminal devices connected to the Internet network. The termination device is a switch device including a router.

  In the data transmission and reception method, the first and second end nodes are terminal devices compliant with the Internet protocol. The terminal device includes a personal computer, a mobile phone, a smart device such as a smartphone and a tablet, and the like.

In the data transmission and reception method described above, before sending the frame, confirm an allowable amount that can be transmitted at once in the Internet network, and based on the allowable amount, a header indicating that the data transmission is in a tunneling method. In addition, the fixed length may be adjusted.

According to another aspect of the invention,
A data transmission and reception device between the first and second end nodes by a tunneling method via the Internet network, the device comprising:
The transmission frame received from the first end node is divided into at least two frames with a predetermined fixed length, a header indicating that the data is divided into the divided frames is added, and the divided A transmission side terminating device for adding a header indicating that each frame is a data transmission of a tunneling scheme, and sequentially transmitting each frame with the header added to a tunnel established in the Internet network;
A receiving-side terminating device for deleting the header indicating that it is a tunneling data transmission from each frame received through the tunnel and sequentially sending the frames from which the header has been deleted to the second end node When,
There is provided a data transmission and reception device characterized in that data reconstruction (reassembly) is performed at the second end node.

  In the data transmission / reception apparatus, the end node is a terminal device conforming to the Internet protocol. The terminal device includes a personal computer, a mobile phone, a smart device such as a smartphone and a tablet, and the like.

  According to the data transmission and reception method by the tunneling method and the apparatus using the same according to the present invention, it is possible to provide the end node (PC) with a data restructuring function. There is an advantage of improving the throughput.

  According to the data transmission and reception method by the tunneling method according to the present invention and the apparatus using the same, it is not necessary to provide the switch apparatus with a data restructuring function, and therefore the switch apparatus can be simplified. There are advantages.

FIG. 1 is a conceptual diagram of a conventional data transmission and reception apparatus that is not a tunneling system. FIG. 2 is a conceptual diagram of a conventional data transmission and reception device based on a tunneling method in which the switch device has a reconstruction function. FIG. 3 is a conceptual diagram of a conventional data transmission and reception device based on a tunneling method in which the switch device does not have a reconstruction function. FIG. 4 is a conceptual diagram of a tunneling data transmission and reception apparatus according to the present invention. FIG. 5 is a diagram showing a processing flow in the transmission side switching device of the tunneling data transmission and reception device according to the present invention. FIG. 6 is a diagram showing a processing flow in the receiving side switching device of the tunneling data transmission and reception device according to the present invention. FIG. 7 is a diagram showing a processing flow at an end node of a tunneling data transmission and reception apparatus according to the present invention.

  Hereinafter, a tunneling data transmission and reception method of the present invention and an apparatus using the same will be described in detail with reference to the accompanying drawings. Throughout the drawings, the same reference numerals and symbols indicate the same components.

FIG. 4 is a schematic diagram of a tunneling data transmission and reception apparatus according to the present invention. The device according to the present invention is mainly composed of a switch device A, a switch device B, end nodes E ₁ and E ₂ , an Internet network 10, and a tunnel T virtually defined between the switch devices A and B. Is done. For convenience of explanation, the switch device A is shown as the transmission side and the switch device B is shown as the reception side, but both have the same function, and either may be the transmission side or the reception side. That is, bidirectional communication is possible between the switch devices A and B. The switch devices A and B are most commonly termination devices such as hubs or routers. The end nodes E ₁ and E ₂ are most typically personal computers (PCs) as terminal devices, and the device of the present invention assumes a packet reassembly (reassembly) function. The terminal device may be any device that conforms to the Internet protocol, and may be a smart device such as a mobile phone other than a personal computer, a smartphone, or a tablet.

  The tunnel T is shown as a GRE tunnel in the drawing, and the following description is also described as a GRE tunnel. However, as described above, the present invention is not limited to GRE tunneling.

Next, the transmission procedure of data in the configuration, the transmission-side switching device A, the receiving-side switching device B, and described separately to the end node E _2.

First, a processing flow in the transmission-side switch device A will be described with reference to FIG. Switch device A, from the external end node E _1, upon receiving a frame of data which is the source in step S501, measuring whether length not capable of passing through in one the frame length GRE tunnel in step 502. That is, MTU (Maximum Transmission Unit) is measured. As a result of the measurement, if it is determined in step S503 that frame division is not necessary, the process proceeds to step S504. In step S504, a GRE header is added to the frame. The frame to which the GRE header is added directly proceeds to step S510, and is sent to the GRE tunnel T in this step.

  On the other hand, if it is determined in step S503 that the frame needs to be divided from the MTU measurement, the process proceeds to step S506 where the frame is divided into a plurality of fixed lengths. Next, the MF (More Fragment) bit of the IP header of the divided first frame is set to “1” which means that the fragment continues (step S507). Subsequently, based on the divided first frame, an IP header with MF = 0 is added to the divided second frame in step S508. Thereafter, a GRE header is added for each frame in step S509.

  As shown in FIG. 2 and FIG. 3, the prior art assigns the GRE header to the frame first and then divides the packet in accordance with the MTU. Is divided and then a GRE header is added to each divided frame, which is greatly different from the conventional one.

  Returning to FIG. 6, each claim to which the GRE header is added in step S509 is sent toward the GRE tunnel T in step S510.

Next, the processing flow in the receiving side switch device B will be described with reference to FIG. When the switching device B receives a frame from the switching device A via the GRE tunnel T in step S601, the switching device B immediately deletes the GRE header from each frame in step S602. Each frame GRE header is deleted, it is transferred as it is to the outside of the end node E ₂ in step S603.

  The switch device B is simplified because the switch device B does not need the function of reassembly (reassembly) as shown in FIGS. 2 and 3 showing the conventional example and only needs to delete the GRE header. Can be easily configured as hardware.

Finally typically described with reference to FIG. 7 the processing flow at the end node E ₂ is a personal computer (PC). The frame transferred from the switching device B is received in step S701, and then in step S702, whether or not it is a divided packet is determined based on the value of the MF bit. If it is determined that the packet is not divided by MF = 0, that is, it is determined that reassembly (reassembly) is not necessary, the data reception process is terminated (END). On the other hand, if it is determined in step S702 that the packet is divided by MF = 1, reconstruction (reassembly) processing is performed in step S703.

  In the apparatus of the present invention, since the reassembly process can be performed on a personal computer (PC), it can be said that the throughput of data transmission / reception is significantly higher than the conventional one.

  While the preferred embodiment of the present invention has been described with reference to the accompanying drawings, it should be understood that the method and apparatus according to the present invention includes modifications and alterations without departing from the scope of the following claims. .

  It can be applied to applications that require large amounts of data to be transmitted at high speed.

A transmitting-side switching device B receiving switch device D data D _{1, D 2} divided data E _{1, E 2} end nodes (PC)
T GRE tunnel 10 Internet network (IP network)

Claims (7)

In the data transmission and reception method between the first and second end nodes by the tunneling method via the Internet network, the method includes:
Dividing the transmission frame received from the first end node into at least two frames with a predetermined fixed length;
Adding a header indicating that the data is divided into each divided frame;
Adding a header indicating that it is a tunneling data transmission to each of the divided frames;
Sequentially sending each frame to which the header is added to a tunnel established in the Internet network;
Removing the header from each frame received through the tunnel;
Sequentially sending each frame from which the header indicating that it is a tunneling data transmission to the second end node;
A data transmission and reception method comprising: reconstructing data (reassembling) at the second end node. 2. The data transmission and reception method according to claim 1, wherein each step is performed between at least two termination devices connected to the Internet network.   2. The data transmission and reception method according to claim 1, wherein the termination device is a switch device including a router.   2. The data transmission and reception method according to claim 1, wherein the end node is a terminal device conforming to the Internet protocol. 2. The data transmission and reception method according to claim 1, wherein an allowable amount that can be transmitted at once in the Internet network is confirmed before the frame is transmitted, and data transmission is performed by a tunneling method based on the allowable amount. A data transmission and reception method, wherein the fixed length is adjusted including a header indicating A data transmission and reception device between the first and second end nodes by a tunneling method via the Internet network, the device comprising:
The transmission frame received from the first end node is divided into at least two frames with a predetermined fixed length, a header indicating that the data is divided into the divided frames is added, and the divided A transmission side terminating device for adding a header indicating that each frame is a data transmission of a tunneling scheme, and sequentially transmitting each frame with the header added to a tunnel established in the Internet network;
A receiving-side terminating device for deleting the header indicating that it is a tunneling data transmission from each frame received through the tunnel and sequentially sending the frames from which the header has been deleted to the second end node When,
The data transmission and reception device is characterized in that data reconstruction (reassembly) is performed in the second end node.   7. The data transmission and reception device according to claim 6, wherein the end node is a terminal device compliant with the Internet protocol.