JP3941925B2 - Network pseudo device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a network simulation apparatus, and more particularly to a network simulation apparatus including a pseudo network including a pseudo network in which a packet received from outside is input / output.
[0002]
[Prior art]
In general, in a large-scale network such as a technical mobile phone network, it is necessary to develop a new communication method and determine the validity of the new communication method when constructing a network that uses the new communication method. This validity determination is often made by actually running an application operating on a network of an existing communication system on a network of a new communication system and measuring transmission characteristics.
[0003]
However, in order to actually run an application on a new communication system network, it is necessary to construct a large-scale network, which is not realistic. Therefore, the transmission characteristics of an application are measured using a network simulation device that simulates the transmission characteristics of a network of a new communication method.
[0004]
[Problems to be solved by the invention]
However, in the general configuration of the network pseudo device, a special protocol is adopted for packet transmission / reception in order to make the packet size transferred to the pseudo network unit the same as the packet size originally transferred to the network. There is a need. Therefore, a special protocol is mounted on the terminal where the application operates.
[0005]
Alternatively, a general-purpose protocol is used for packet transmission / reception, and the packet is transferred to the pseudo network unit in the apparatus with the protocol header used for packet transmission / reception attached. Therefore, the size of the packet transferred to the pseudo network unit is different from the size of the packet originally transferred to the network.
[0006]
The present invention has been made to solve the above-described drawbacks of the prior art, and the object thereof is to introduce a frame that passes through a pseudo network without introducing a special protocol and using a general-purpose protocol as a link protocol. Is to provide a network simulation apparatus that can make the total size of the network equivalent to that of the original network.
[0007]
[Means for Solving the Problems]
The network pseudo device according to claim 1 of the present invention is a network pseudo device including a pseudo network in which a packet received from outside is inputted and outputted, and determines whether or not the received packet is a packet according to a specific protocol. A determination unit; and a conversion unit that converts the packet into a packet for the pseudo network when the determination unit determines that the packet is based on the specific protocol, and converts the packet converted by the conversion unit into the packet The packet is input to the pseudo network, and the determination unit determines that the packet is not based on the specific protocol. If the packet is based on another protocol, the packet is output to the outside .
[0008]
The network simulation apparatus according to claim 2 of the present invention is the network simulation apparatus according to claim 1, wherein the packet includes a header, the determination unit determines a protocol based on the content of the header, and the conversion unit deletes the header. It is characterized by that.
The network pseudo apparatus according to claim 3 of the present invention is characterized in that, in claim 2, the conversion means adds the header to a packet output from the pseudo network, and outputs the added packet to the outside. To do.
[0009]
A network simulation apparatus according to claim 4 of the present invention is characterized in that, in claim 1, when the determination means determines that the packet is not based on the specific protocol, the packet is discarded .
[0010]
In short, this apparatus monitors received packets, changes the header part of transmission / reception packets based on a preset pattern, and performs packet transfer control to the pseudo network. That is, by changing the header part of the transmission / reception packet and performing packet transfer control, it is possible to accurately simulate the transmission characteristics corresponding to the packet size to be transferred while using a general-purpose protocol for packet transmission / reception.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. In each drawing referred to in the following description, the same reference numerals are given to the same parts as in the other drawings.
FIG. 1 is a block diagram showing an embodiment of a network simulation apparatus according to the present invention. As shown in the figure, the network simulation apparatus 1 according to the present embodiment includes a pseudo network unit 10 having network transmission characteristics, interfaces 12 and 22, and a packet of a specific protocol with a predetermined header. Pattern matching units 13 and 23 and header pattern matching units 16 and 26 for determining whether or not the header matches, header deletion unit 14 and 24 for performing processing for deleting the packet header, and header for the packet The header adding units 15 and 25 that perform the adding process are included.
[0012]
The network simulation apparatus 1 having such a configuration is connected to a terminal 11 outside the apparatus via an interface 12. The network simulation apparatus 1 is connected to a terminal 21 outside the apparatus via an interface 22. The terminal 11 and the terminal 21 can communicate with each other via the network simulation device 1. In this example, the link protocol between the terminal 11 and the network simulation device 1 and the link protocol between the terminal 12 and the network simulation device 1 are Ethernet (registered trademark) (hereinafter abbreviated as R). is there.
[0013]
The pseudo network unit 10 has a function of simulating the transmission characteristics of the network. The simulated target network of the simulated network unit 10 is a network that does not use Ethernet (R) as a link protocol.
In the interface 12, the Ethernet (R) frame received from the terminal 11 is transferred to the pattern matching unit 13, and the pattern matching unit 13 verifies whether the header in the frame matches a conditional expression (described later) set. To do. When the conditional expression is met, the frame is transferred to the header deleting unit 14, the Ethernet (R) header in the frame is deleted, and the packet is transferred to the pseudo network unit 10. That is, the protocol is determined based on the contents of the header, and the packet is converted into a packet for the pseudo network unit 10 by deleting the header.
[0014]
On the other hand, when the conditional expression is not met, the frame is transferred to the header pattern matching unit 16. The header pattern matching unit 16 verifies whether the header in the frame matches the set conditional expression. When the conditional expression is met, the packet is transferred according to another protocol different from the above protocol, and is transferred to the interface 22. If they do not match, discard the frame.
[0015]
Similarly, in the interface 22, the Ethernet (R) frame received from the terminal 21 is transferred to the pattern matching unit 23, and the pattern matching unit 23 matches the set conditional expression (described later). Verify that. When the conditional expression is met, the frame is transferred to the header deleting unit 24, and the Ethernet (R) header in the frame is deleted. The packet after the header deletion is transferred to the pseudo network unit 10. That is, the protocol is determined based on the contents of the header, and the packet is converted into a packet for the pseudo network unit 10 by deleting the header.
[0016]
On the other hand, when the conditional expression is not met, the frame is transferred to the header pattern matching unit 26. The header pattern matching unit 26 verifies whether the header in the frame matches the set conditional expression. When the conditional expression is met, the packet is transferred according to another protocol different from the above protocol, and is transferred to the interface 12. If the conditional expression is not met, the frame is discarded.
[0017]
The pseudo network unit 10 adds a delay to the frame received from the header deletion unit 14 and passes it to the header addition unit 25 or discards it according to the transmission characteristics of the simulated network. Similarly, a delay is added to the packet received from the header deletion unit 24 and the packet is transferred to the header addition unit 15 or discarded.
The header adding unit 15 adds the header deleted by the header deleting unit 24 to the frame received from the pseudo network unit 10 to reconfigure the Ethernet (R) frame. The reconstructed frame is transferred to the interface 12. Similarly, the header adding unit 25 adds the header deleted by the header deleting unit 14 to the frame received from the pseudo network unit 10, reconfigures the Ethernet (R) frame, and transfers the frame to the interface 22.
[0018]
Here, an example of setting the conditional expressions in each of the pattern matching units 13, 23, 16, and 26 is shown in FIG. As shown in the figure, in the pattern matching units 13 and 23, a MAC (Media Access Control) address is a matching target. First, the pattern matching unit 13 uses a conditional expression that the destination MAC address = the MAC address of the terminal 21 and the source MAC address = the MAC address of the terminal 11. In the pattern matching unit 23, the conditional expression is that the destination MAC address = the MAC address of the terminal 11 and the source MAC address = the MAC address of the terminal 21. The header pattern matching unit 16 uses Ethernet (R) type = ARP (Address Resolution Protocol) as a conditional expression, and the header pattern matching unit 26 uses Ethernet (R) type = ARP as a conditional expression. To do.
[0019]
By using the conditional expression shown in the figure, the header of the Ethernet (R) is removed from only the Ethernet (R) frame exchanged between the terminal 11 and the terminal 12, and this head is removed. The frame passes through the pseudo network unit 10. On the other hand, an ARP protocol frame for address resolution is directly exchanged between the terminal 11 and the terminal 21 without passing through the pseudo network unit 10.
[0020]
As described above, the simulated target network of the simulated network unit 10 is a network that does not use Ethernet (R) as the link protocol. For this reason, the ARP protocol packet does not occur in the original network. The total size of the frames passing through the pseudo network unit 10 is equivalent to the original network.
[0021]
As described above, in the present apparatus, the header portion that matches a predetermined condition is deleted and transferred to the pseudo network, so that the packet size to be transferred can be handled while using a general protocol for packet transmission / reception. Transmission characteristics can be accurately simulated.
Although the case of Ethernet (R) has been described above, it is obvious that the present invention can be applied to the case of other protocols without being limited to this.
[0022]
【The invention's effect】
As described above, the present invention does not introduce a special protocol by performing pattern matching of received frames, frame transfer control, frame header deletion, and frame header addition in a network pseudo device, and is a general-purpose link protocol. There is an effect that the total size of the frames passing through the pseudo network can be made equal to that of the original network while using a conventional protocol.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a network simulation apparatus according to the present invention.
FIG. 2 is a diagram illustrating an example of setting a conditional expression of a pattern matching unit in the network simulation apparatus of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Network pseudo-device 10 Pseudo network part 11, 21 Terminal 12, 22 Interface 13, 16 Pattern matching part 14, 24 Header deletion part 15, 25 Header addition part 16, 26 Header pattern matching part

Claims (4)

A network pseudo apparatus including a pseudo network in which a packet received from outside is input / output, wherein a judgment means for judging whether or not the received packet is a packet according to a specific protocol, and the specific protocol by the judgment means Conversion means for converting the packet into a packet for the pseudo network when the packet is determined by the conversion means, the packet converted by the conversion means is input to the pseudo network, and the specifying means by the determination means A network simulation apparatus, characterized in that, if it is determined that the packet is not in accordance with the protocol, but is a packet in another protocol, the packet is output to the outside .   2. The network simulation apparatus according to claim 1, wherein the packet includes a header, the determination unit determines a protocol based on contents of the header, and the conversion unit deletes the header.   3. The network simulation apparatus according to claim 2, wherein the conversion unit adds the header to a packet output from the pseudo network, and outputs the added packet to the outside.   2. The network pseudo device according to claim 1, wherein when the determination unit determines that the packet is not based on the specific protocol, the packet is discarded.

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