KR20110064539A - Apparatus and method for virtual network simulation using multiple virtual machines - Google Patents

Abstract

PURPOSE: A network simulation apparatus using a plurality of VM and a method thereof are provided to perform network simulation by generating a VM equipped with a communication socket with the other VM. CONSTITUTION: A VM(Virtual Machine)(24) performs the function of network equipment which is operated under an OS(Operating System). The VM creates a communication socket with the other VM. According to the command of a client, a VM monitor(23) creates the VM. A host machine(22) transfers the command of the client to the VM monitor. The host machine creates the VM.

Description

Apparatus and method for network simulation using multiple virtual machines {APPARATUS AND METHOD FOR VIRTUAL NETWORK SIMULATION USING MULTIPLE VIRTUAL MACHINES}

The present invention relates to a network simulation apparatus and a method using a plurality of virtual machines, and more particularly, to perform a function of the network equipment while operating under a predetermined operating system according to a command from an external client, the actual network driver in its own host machine The present invention relates to a network simulation apparatus using a plurality of virtual machines and a method for generating a virtual machine connected to the network simulation.

A virtual machine is a technology that configures a plurality of virtual hardware in one personal computer (PC) or server and executes a new operating system using the same.

At this time, the actual PC or server where virtual hardware is created is called a host machine, and the program that configures the virtual hardware therein is called a virtual machine monitor or a hypervisor, and the virtual hardware generated by the virtual machine monitor The corresponding operating system is called a virtual machine. Virtual machine monitors include Vmware, a popular commercial product, and open source, QEMU and Virtualbox.

The virtual network simulation system generates a plurality of virtual machines that operate as routers, and builds and simulates one virtualized network through the connection between the virtual routers.

Programs such as 'NS2' and 'Opnet', which are general network simulation tools, perform network modeling to perform the same operations as a real router or PC. Therefore, there is a limit in accuracy and simulation speed.

In addition, building and testing a testbed that actually configures routers and servers creates enormous cost problems.

As a conventional technique for solving this problem, a method of simulating after creating a plurality of virtual machines on a single PC or server using virtualization technology has been attempted, but it has not been suggested a specific method for ensuring smooth communication between virtual machines. It was.

On the other hand, since the conventional technology simulates a virtual machine generated on one PC or server, there is a problem in that scalability is limited.

It is a problem of the present invention to solve the problems of the prior art as described above.

Accordingly, the present invention performs network simulation while operating under a predetermined operating system according to a command from an external client, and creates a virtual machine having a socket for communication with another virtual machine to perform network simulation, thereby smoothly communicating between virtual machines. The purpose of the present invention is to provide a network simulation apparatus and method using a plurality of virtual machines in order to provide a system, and to artificially generate various obstacles so as to develop a countermeasure in advance.

In addition, the present invention performs the function of the network equipment while operating under a predetermined operating system according to a command from an external client, and creates a virtual machine connected to the actual network driver in its host machine to perform network simulation, thereby smoothly communicating between the virtual machines. Network simulation apparatus using multiple virtual machines, and the like, to construct a large-capacity virtual network similar to a commercial network, and to artificially generate various obstacles and to develop countermeasures in advance. There is another purpose in providing a method.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The apparatus of the present invention for achieving the above object is a network simulation apparatus in an environment in which at least two virtual machines are created on one host machine, and performs functions of network equipment operating under an operating system, and another virtual machine. A virtual machine for creating a socket for communication with the network; A virtual machine monitor for generating the virtual machine according to a command of a client; And a host machine for transmitting the command from the client to the virtual machine monitor to generate the virtual machine.

In addition, the method of the present invention for achieving the above object, in a network simulation method in an environment in which at least two virtual machines are created on one host machine, performing the function of the first network equipment while operating under the first operating system Generating a first virtual machine to generate a first virtual machine; Creating, by the first virtual machine, a socket for communication with a second virtual machine; A second virtual machine generating step of generating a second virtual machine operating under a second operating system and performing a function of a second network equipment; Generating, by the second virtual machine, a socket for communication with the first virtual machine; And performing a corresponding function while communicating with each other through the created communication socket.

On the other hand, the apparatus of the present invention for achieving the above object, in the network simulation apparatus in the environment in which the virtual machine is created on different host machine, performs the function of the network equipment operating under the operating system, A virtual machine for communicating with a virtual machine on another host machine through a network driver; A virtual machine monitor for generating the virtual machine according to a command of a client; And a host machine for transmitting the command from the client to the virtual machine monitor to generate the virtual machine.

In addition, the method of the present invention for achieving the above another object, in the network simulation method in the environment where the virtual machine is created on different host machine, performing the function of the first network equipment while operating under the first operating system Generating a first virtual machine; A first connection step of connecting the first virtual machine with a network driver in its host machine; A second virtual machine generating step of generating a second virtual machine operating under a second operating system and performing a function of a second network equipment; A second connection step of connecting the second virtual machine with a network driver in its host machine; And performing a corresponding function while communicating with each other through the connected network drivers.

The present invention as described above, by operating under a predetermined operating system according to a command from an external client to perform the function of the network equipment and to create a virtual machine having a socket for communication with other virtual machines to perform network simulation, It has the effect of providing smooth communication and artificially generating various obstacles to develop countermeasures in advance.

In addition, the present invention performs the function of the network equipment while operating under a predetermined operating system according to a command from an external client, and creates a virtual machine connected to the actual network driver in its host machine to perform network simulation, thereby smoothly communicating between the virtual machines. In addition to providing a large amount of virtual network similar to the commercial network, it is possible to artificially generate a number of failures and to develop countermeasures in advance.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, It can be easily carried out. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an embodiment of a network simulation system using a plurality of virtual machines to which the present invention is applied.

As shown in FIG. 1, a network simulation system using a plurality of virtual machines to which the present invention is applied includes a client program (hereinafter referred to as a client) 10 and a plurality of network simulation apparatuses 20 located at a control terminal. do.

The client 10 communicates with a plurality of host machines to instruct and control the creation of the virtual machine. At this time, the client 10 communicates with the virtual machine in each host machine through a virtual machine control interface (VM API).

The network simulation apparatus 20 transmits a command received from the client 10 through the virtual machine control interface to the virtual machine monitor to generate a virtual machine 24 performing a function of the corresponding network equipment, and a network. It includes a number of virtual machines to perform the functions of the equipment.

The network simulation system having such a configuration has a very easy advantage of increasing the number of virtual machines performing the functions of network equipment by using the server / client model.

That is, the network simulation test may be performed by generating at least one virtual machine in one host machine according to the virtual machine creation command from the client 10, or may generate a virtual machine in a plurality of host machines to perform a network simulation test. It can also be done so its expansion is very easy.

To do this, it is necessary to provide the same type of communication between virtual machines of different types. Detailed description thereof will be made later.

2 is a diagram illustrating an embodiment of a network simulation apparatus using a plurality of virtual machines according to the present invention.

As shown in FIG. 2, the network simulation apparatus using a plurality of virtual machines according to the present invention receives a command received from the client 10 through a virtual machine control interface (VM API) 21 for each virtual machine monitor 23. According to the command received from the host machine 22 and the host machine 22 to allow each virtual machine monitor 23 to create and control the virtual machine 24 performing the functions of the corresponding network equipment. At least one virtual machine 24 generated by the virtual machine monitor 23 and the virtual machine monitor 23 for generating the virtual machine 24 performing the function of the corresponding network equipment and performing the function of the network equipment. It includes.

The virtual machine control interface 21 also operates on the host machine 22 to provide an interface between the client 10 and all virtual machines created in the host machine 22.

In addition, the virtual machine 24 generates a communication socket or communicates with a network driver in the host machine in order to communicate with other virtual machines.

Hereinafter, the type of the virtual machine monitor 23 and the virtual machine 24 generated by each virtual machine monitor 23 will be described.

First, the types of the virtual machine monitor 23 include 'Xen', 'Dynamips', and 'QEMU'. 'Xen' and 'QEMU' are the sources of virtualization of general personal computer (PC) hardware. Virtual machines such as Windows, Linux, Solaris, and Juniper routers can be virtualized, and 'Dynamips' is used to virtualize 'MIPS CPU'. It can be used to virtualize the Cisco Router 7200 Series, the Cisco Router 3800 Series, and the Cisco Router 2800 Series.

Therefore, 'Xen' or 'QEMU' virtualizes Juniper routers, which are network devices, Junos, which is an operating system, and Network Interface Card (NIC) drivers, which are network drivers. Create a virtual machine. In this case, the present invention creates a UDP (User Datagram Protocol) socket so that the first virtual machine can communicate with other virtual machines smoothly, which is performed by the virtual NIC driver.

In addition, 'Dynamips' virtualizes a Cisco router, which is a network device, an operating system, 'IOS', and a virtual NIC driver, which is a network drive, to create a second virtual machine that performs a function of a Cisco router operating in the 'IOS'. In this case, in the present invention, a UDP socket is created so that the second virtual machine can communicate with other virtual machines smoothly, which is performed by the virtual NIC driver.

3 is an exemplary view of a client configuring and controlling a virtual network according to the present invention.

As shown in FIG. 3, the client terminal to which the client program is applied includes a virtual machine category 31 for managing the types of virtual machines provided by the host machine, a topology management 32 for establishing a virtual network, and a virtual machine. A client API 33 for control.

Therefore, the user can configure a virtual network by dragging and dropping a desired virtual machine into the topology area in the category of the virtual machine on the screen where the client program is executed.

At this time, the user can select a hardware type of the virtual machine existing in the topology management 32 area, and each virtual machine is interconnected by a network.

4 is a diagram illustrating an embodiment of a communication process between virtual machines in a network simulation apparatus using a plurality of virtual machines according to the present invention, and illustrates a communication process between two virtual machines generated on one host machine. For the sake of understanding, two virtual machines are described as examples, but the number of virtual machines has no influence on the present invention.

As shown in FIG. 4, the first virtual machine 41 for performing the functions of the Juniper router operating under the Junos operating system on one host machine and the Cisco router operating under the 'IOS' operating system are performed. The second virtual machine 42 is created for this purpose.

At this time, the virtual NIC driver in each virtual machine creates a UDP socket for communicating with another virtual machine. That is, the virtual NIC driver of the first virtual machine 41 creates a UDP socket for communicating with the second virtual machine 42 and then communicates through the UDP packet, and the virtual NIC driver of the second virtual machine 42 After creating a UDP socket for communicating with the first virtual machine 41, it communicates via a UDP packet.

As a result, the virtual NIC driver of the first virtual machine 41 and the virtual NIC driver of the second virtual machine 42 are interconnected through a UDP socket. For example, the UDP packet transmitted from the first virtual machine 41 to the second virtual machine 42 uses the server port 10000, and the UDP packet transmitted from the second virtual machine 42 to the first virtual machine 41. Uses server port 1001.

At this time, the network driver (virtual NIC driver) of each virtual machine operates as a UDP server, and the IP address uses 127.0.0.1, a 'Loopback address'.

5 is a diagram illustrating another embodiment of a communication process between virtual machines in a network simulation device using a plurality of virtual machines according to the present invention, and illustrates a communication process between virtual machines generated in different host machines.

As shown in FIG. 5, a first virtual machine 41 is created on a first host machine to perform a function of a Juniper router operating under a Junos operating system, and an 'IOS' on a second host machine. A second virtual machine 42 is created to perform the function of a Cisco router operating under an operating system.

At this time, the virtual NIC driver in the first virtual machine 41 and the virtual NIC driver in the second virtual machine 42 connect with the actual NIC driver through the TAP interface in their host machine to communicate with each other.

That is, the virtual NIC driver of the first virtual machine 41 created on the first host machine connects to the actual NIC driver 52 on the first host machine through the TAP interface 51 and connects to the second host machine. The generated virtual NIC driver of the second virtual machine 42 connects with the actual NIC driver 54 on the second host machine through the TAP interface 53.

As a result, the first virtual machine 41 and the second virtual machine 42 may be connected to the Internet to communicate with each other. At this time, the IP address uses a public IP assigned to the TAP interface.

In this case, the TAP interface is a virtual network interface for communication between the kernel and the application. The application can transmit a packet to the kernel by sending a packet to the TAP interface, and the application can receive a packet transmitted by the kernel to the TAP interface. have. It is mainly used to process Ethernet frames.

6 is a flowchart illustrating a network simulation method using a plurality of virtual machines according to the present invention, and illustrates a network simulation process in an environment in which at least two virtual machines are generated on one host machine.

First, in operation 601, a first virtual machine that operates under a first operating system and performs a function of a first network device.

The first virtual machine creates a socket for communication with the second virtual machine (602).

In operation 603, a second virtual machine which operates under a second operating system and performs a function of a second network device is created.

The second virtual machine creates a socket for communication with the first virtual machine (604).

Subsequently, the corresponding function is performed while communicating with each other through the created communication socket (605). That is, the first virtual machine and the second virtual machine perform network simulation while communicating with each other through a communication socket.

Through this process, smooth communication between virtual machines is possible in an environment in which at least two virtual machines are created on one host machine, and thus, optimal network simulation can be performed.

7 is a flowchart illustrating a network simulation method using a plurality of virtual machines according to the present invention, and illustrates a network simulation process in an environment in which virtual machines are generated on different host machines.

First, in operation 701, a first virtual machine that operates under a first operating system and performs a function of a first network device is created.

The first virtual machine connects with the network driver in its host machine (702).

In operation 703, a second virtual machine is generated under the operating system of the second operating system, which performs the function of the second network equipment.

The second virtual machine connects with the network driver in its host machine (704).

In operation 705, the corresponding driver communicates with each other through the connected network driver. That is, the first virtual machine and the second virtual machine connect to a network driver through a TAP interface in their host machine and perform network simulation while communicating with each other in the Internet environment.

Through this process, it is possible to perform smooth network communication between virtual machines in an environment where virtual machines are created on different host machines, and to perform an optimal network simulation and to build a large-capacity virtual network similar to a commercial network. .

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

1 is a configuration diagram of an embodiment of a network simulation system using a plurality of virtual machines to which the present invention is applied;

2 is a configuration diagram of an embodiment of a network simulation apparatus using a plurality of virtual machines according to the present invention;

3 is an exemplary view of a client configuring and controlling a virtual network according to the present invention;

4 is a diagram illustrating an embodiment of a communication process between virtual machines in a network simulation apparatus using a plurality of virtual machines according to the present invention;

5 is a diagram illustrating another embodiment of a communication process between virtual machines in a network simulation apparatus using multiple virtual machines according to the present invention;

6 is a flowchart illustrating an embodiment of a network simulation method using multiple virtual machines according to the present invention;

7 is a flowchart illustrating another embodiment of a network simulation method using multiple virtual machines according to the present invention.

* Explanation of symbols for the main parts of the drawings

21: VM API 22: Host Machine

23: virtual machine monitor 24: virtual machine

Claims (12)

In the network simulation apparatus in an environment in which at least two virtual machines are created on one host machine, A virtual machine that performs a function of a network device operating under an operating system and creates a socket for communication with another virtual machine; A virtual machine monitor for generating the virtual machine according to a command of a client; And Host machine for transmitting the command from the client to the virtual machine monitor to create the virtual machine Network simulation apparatus using a plurality of virtual machines including a. The method of claim 1, The host machine, Network simulation apparatus using a plurality of virtual machines, characterized in that for receiving a command from the client via a virtual machine control interface. The method according to claim 1 or 2, The virtual machine, Network simulation device using a plurality of virtual machines including a virtual network interface card (NIC) driver for creating a communication socket. The method of claim 3, wherein The communication socket, Network simulation apparatus using a plurality of virtual machines, characterized in that the UDP (User Datagram Protocol) socket. In the network simulation method in an environment in which at least two virtual machines are created on one host machine, A first virtual machine generating step of generating a first virtual machine operating under a first operating system and performing a function of a first network equipment; Creating, by the first virtual machine, a socket for communication with a second virtual machine; A second virtual machine generating step of generating a second virtual machine operating under a second operating system and performing a function of a second network equipment; Generating, by the second virtual machine, a socket for communication with the first virtual machine; And Performing a function while communicating with each other through the created communication socket; Network simulation method using a plurality of virtual machines including a. The method of claim 5, The first virtual machine generation step and the second virtual machine generation step, Network simulation method using a plurality of virtual machines, characterized in that for receiving a command from the client via a virtual machine control interface to create a corresponding virtual machine. The method according to claim 5 or 6, The communication socket, Network simulation method using a plurality of virtual machines, characterized in that the UDP (User Datagram Protocol) socket. In the network simulation apparatus in an environment where virtual machines are created on different host machines, A virtual machine that performs a function of a network device operating under an operating system and communicates with a virtual machine on another host machine through a network driver of the corresponding host machine; A virtual machine monitor for generating the virtual machine according to a command of a client; And Host machine for transmitting the command from the client to the virtual machine monitor to create the virtual machine Network simulation apparatus using a plurality of virtual machines including a. The method of claim 8, The virtual machine, A virtual NIC (Network Interface Card) driver for connecting with the network driver of the host machine, wherein the virtual NIC driver is connected to the network driver of the host machine through a TAP interface using a plurality of virtual machines Network simulation device. 10. The method according to claim 8 or 9, The host machine, Network simulation apparatus using a plurality of virtual machines, characterized in that for receiving a command from the client via a virtual machine control interface. In the network simulation method in an environment where virtual machines are created on different host machines, Creating a first virtual machine operating under a first operating system and performing a function of the first network equipment; A first connection step of connecting the first virtual machine with a network driver in its host machine; Creating a second virtual machine operating under a second operating system and performing a function of a second network equipment; A second connection step of connecting the second virtual machine with a network driver in its host machine; And Steps to perform the function while communicating with each other through the connected network driver Network simulation method using a plurality of virtual machines including a. The method of claim 11, The first connection step and the second connection step, Network simulation method using a plurality of virtual machines, characterized in that connected to the network driver through the TAP interface of the host machine.

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