KR100456095B1 - Method and Apparatus for setting IP address automatically, Computer program for embodying said apparatus and readable record medium having said computer program - Google Patents

Abstract

In a device in which a plurality of computer systems are assigned to respective subnets assigned to respective IP addresses and automatically set IP addresses, statistically most consistent based on ARP packets transmitted between the respective computer systems through network sniffing. A subnet determination module for determining a subnet based on an ARP packet, and a gateway for determining an IP address included in one ARP packet as a gateway IP address from a connection defined as a plurality of ARP packets for one ARP packet from the ARP packets. IP detection module, an empty IP detection module for generating a ping packet (broadcast packet) to all computer systems connected to the subnet to broadcast a response to check whether the response is a blank IP address; And controlling the modules to sequentially operate by first detecting the connection to the subnet, and storing a IP address set by the empty IP address detection module in a network environment information database corresponding to a specific identifier. The setting device is started.

Description

Method and Apparatus for setting IP address automatically, Computer program for embodying said apparatus and readable record medium having said computer program}

The present invention relates to an automatic IP address setting method, a setting device and a computer program for realizing the device, and a readable recording medium in a computer that records these programs. More particularly, the present invention relates to a portable terminal device that can be connected to the Internet. An automatic IP address setting method for automatically allocating and setting available IP addresses when the network environment changes, a setting apparatus, a computer program for realizing the apparatus, and a readable recording medium in a computer recording these programs. will be.

In general, in order for a computer user to access a TCP / IP network such as the Internet, the network environment must be set manually. The items for the network environment setting include an IP address, a gateway, and a subnet address. address), and this value is usually assigned to the network administrator.

In a fixed computer system, such as a desktop, setting up a network environment as described above will rarely require a subsequent reset. However, in a mobile terminal device such as a laptop or a PDA, a network environment must be set for access to a TCP / IP network according to a moving place, and in particular, an IP address needs to be set automatically without being assigned to an administrator.

To this end, software such as "IP changer 2.0" of Plus Technology has been developed. That is, for example, when using a laptop at home and at work, the IP address of the company and the home IP address are registered respectively, and the registered IP address is selected and used whenever the place is changed.

In addition, the IP address is automatically set by applying the Dynamic Host Configuration Protocol (DHCP). DHCP is a protocol that allows network administrators to centrally manage and assign IP addresses on a network in an organization. Network managers centrally manage and assign IP addresses, and are automatically updated when computers connect to other locations on the network. Allows you to send an IP address.

However, these conventional IP automatic setting devices have their own problems.

In "IP changer 2.0", the IP address must be assigned to the network administrator and manual registration is cumbersome. In addition, even if the same IP address is assigned to a plurality of users due to a mistake of the network administrator, there is a problem that there is no alternative.

In case of applying the DHCP technology, it is difficult to manage because a separate DHCP server needs to be operated, and there is a problem that users have to take inconvenience because there are not many places that operate a DHCP server.

Accordingly, an object of the present invention is to provide an automatic IP address setting method for automatically assigning and setting an IP address when connected to a specific network, a setting device, and a computer program for realizing the device, and reading from a computer recording these programs. It is to provide a possible recording medium.

It is another object of the present invention to provide an automatic IP address setting method, a setting device, and a computer program for realizing the device, which can simply and automatically change the IP address when a conflict occurs due to the IP address being shared by different users. To provide a computer-readable recording medium for recording these programs.

Other objects and features of the present invention will be more clearly understood through the preferred embodiments described below.

1 is a system block diagram showing an automatic IP setting apparatus according to the present invention.

2 is a flowchart illustrating an automatic IP setting method according to the present invention.

3 is a block diagram showing a network to which the present invention is applied.

According to a first aspect of the present invention, an apparatus for automatically setting an IP address by connecting a plurality of computer systems to a subnet in which each IP address is assigned and operated is based on an ARP packet transmitted between each computer system through network sniffing. Subnet discrimination module for determining the subnet based on the statistically most matching ARP packet, the gateway to the IP address included in one ARP packet from the connection that is determined as a plurality of ARP packets for one ARP packet from the ARP packets A gateway IP detection module for determining an IP address, a blank IP detection module for detecting a response to a blank IP address by making a ping packet and broadcasting a ping packet to all computer systems connected to the subnet; An IP address changing module which monitors whether a collision of another IP address occurs while using the set empty IP address, and automatically changes the set empty IP address to another empty IP address when detecting an ARP packet corresponding to the collision; And controlling the modules to sequentially operate by first detecting the connection to the subnet, and storing a IP address set by the empty IP address detection module in a network environment information database corresponding to a specific identifier. The setting device is started.

According to another aspect of the present invention, an apparatus for automatically setting an IP address by connecting a plurality of computer systems to a subnet in which each IP address is assigned and operated, wherein the ARP packet is transmitted between the computer systems through network sniffing. Subnet discrimination module for discriminating subnets based on statistically most matching ARP packets based on the IP address included in one ARP packet from a connection defined as a plurality of ARP packets for one ARP packet from ARP packets A gateway IP detection module for determining a gateway IP address, and a blank IP detection module configured to detect a response by checking whether or not a response is made by broadcasting a ping packet to all computer systems connected to the subnet to broadcast a response; A test module configured to test whether the set empty IP address operates properly, to drive a web browser to access a specific site, and to determine whether the set empty IP address is correct based on the result; And controlling the modules to sequentially operate by first detecting the connection to the subnet, and storing a IP address set by the empty IP address detection module in a network environment information database corresponding to a specific identifier. The setting device is started.

According to a second aspect of the present invention, a method of automatically setting an IP address by connecting a plurality of computer systems to a subnet in which each IP address is allocated and operating, the network number and the subnet for ARP packets detected through network sniffing Sequentially comparing up to an address and statistically analyzing it to determine the most matching number as a subnet address, detecting an ARP packet, and including an IP included in one packet from a connection defined as a plurality of packets for one packet. Determining an address as a gateway IP address; Checking whether an operation is normally performed by accessing an external network through the determined IP address; And generating a ping packet to all computer systems connected to the subnet, broadcasting a broadcast message, checking whether there is a response, and setting an empty IP address if there is no response.

More preferably, the method may further include checking whether to store the set network environment, and storing the network environment corresponding to an appropriate identifier in the network environment information database.

In addition, if the collision is detected by determining whether the IP address is collided through network monitoring, the process returns to the step of detecting an empty IP address and repeating the above procedures.

According to a third aspect of the present invention, a computer program in which a plurality of computer systems are assigned to respective IP addresses and connected to a subnet in which the plurality of computer systems operate is configured to automatically set an IP address. Compares the subnet addresses sequentially and statistically analyzes them to determine the most matching number as the subnet address, and detects ARP packets to be included in one packet from a connection determined by multiple packets for one packet. Determining the IP address as a gateway IP address; A procedure for checking whether an operation is normally performed by accessing an external network through the determined IP address; And a computer program including a procedure of making a ping packet to all computer systems connected to the subnet, broadcasting it, checking whether there is a response, and setting the empty IP address if there is no response.

According to a fourth aspect of the present invention, a network sniffer in a readable recording medium on a computer program in which a plurality of computer systems are assigned a respective IP address and is connected to a subnet in which it operates and automatically sets an IP address. ARP packets detected through the network number and subnet address are compared sequentially and statistically analyzed to determine the most matching number as the subnet address, the ARP packet to detect a plurality of packets for one packet Determining an IP address included in one packet as a gateway IP address from a connection determined as follows; A procedure for checking whether an operation is normally performed by accessing an external network through the determined IP address; And a step of making a ping packet to all computer systems connected to the subnet, broadcasting it, checking whether there is a response, and setting the empty IP address if there is no response. A readable recording medium is disclosed.

Hereinafter, with reference to the accompanying drawings will be described in more detail the features of the present invention.

In the present invention, basically, a network sniffing technique is used to detect a subnet based on statistics, a gateway is detected, and an empty IP address using a temporarily created ping packet. Automatically detected.

Sniffer for sniffing is a program that monitors and analyzes network traffic, and finds problems such as bottlenecks. With this information, network managers can effectively keep track of traffic trends.

Sniffers can also be used to capture data sent over a network. A router reads all data packets passing through it for the purpose of determining whether the packet should be sent to its network or to continue to be delivered over the Internet. Therefore, a router equipped with a sniffer can read not only the source and destination addresses but also the data in the packet.

Referring to Fig. 1, a configuration of an automatic IP address setting apparatus according to the present invention is shown.

The subnet determination module 110 determines a subnet based on the ARP packet that matches the most statistically based on the ARP packet obtained through network sniffing for a predetermined time.

Address Resolution Protocol (ARP) is a protocol used to map IP addresses to physical network addresses on an IP network. In this case, the physical network address means a 48-bit network card address of Ethernet or Token Ring. For example, if IP host A wants to send an IP packet to IP host B, but does not know the physical network address of IP host B, ARP with destination IP address B and broadcasting physical network address FFFFFFFFFFFF using ARP protocol Send the packet on the network. IP host B responds to A with its physical network address when it receives an ARP packet whose IP address is at its destination.

In addition, a subnet is an abbreviation for a subnetwork, and refers to a network belonging to an institution but that can be recognized as a separate part.

As mentioned above, the Internet is a set of networks for communicating among network users, and communication requires the source and destination networks to which both users or hosts are associated, and the addresses of specific computers within the network. The address is called the Internet Protocol address. The 32-bit IP address is divided into two parts: one for the network number that identifies the network, and one for the host number that identifies a particular computer or host within the network. An organization may use some of the bits in an address that identifies a computer or host to identify a particular subnet. So in reality, the IP address contains three parts: the network number, the subnet number, and the computer number.

For example, the 32-bit IP address "130.5.5.25" is divided as follows.

<-Network number-> <-host number->

130. 5. 5. 25

If you want to add a subnet to this address, you can use a portion of the host number (for example, 8 bits out of 16 bits total) as the subnet address.

<-Network Number-> <-Subnet Address-> <-Host Number->

130. 5. 5. 25

For simplicity, we've set the subnet to 8 bits for simplicity, but you can actually choose a different configuration, such as using only a portion of the third quad, even a portion of the fourth quad.

Therefore, if the network number and the subnet address are sequentially compared to the ARP packets detected through network sniffing and analyzed statistically, the most matching number will be the subnet address.

Considering that there are cases where ARP packets come from other than subnets, it can be said that it is statistically most accurate to determine the number of probabilities that are most frequently detected within a certain time as the subnet address.

The gateway IP detection module 120 detects an ARP packet and determines an address corresponding to "1" as a gateway IP address from a connection determined as "1: many".

Computer systems connected to a specific subnet must go through a gateway in order to connect to an external network. That is, the ARP packet finds the media access control (MAC) address of the gateway and sends the packet to the outside through the gateway. For reference, the MAC address is an address used by the MAC layer of the data link layer in a local area network and refers to a 48-bit hardware address of a network card.

Therefore, if the ARP packet sent from the computer system to the gateway and the ARP packet sent by the gateway are detected and analyzed, "1: many" types are detected based on the ARP packet, so that an ARP packet corresponding to "1" is generated. This is the gateway IP address.

The blank IP detection module 130 detects a blank IP address by checking whether or not a response is made by broadcasting a ping packet from a newly connected computer system to all computer systems connected to the subnet. That is, when there is a response from each computer system, it is determined to be an IP address used because it is detected by sniffing, and when there is no response, it is determined as an empty IP address.

When the IP address change module 140 detects an ARP packet corresponding to the collision while monitoring whether an IP address collision occurs while using the detected empty IP address, the IP address change module 140 automatically uses another empty IP address detection method. Change to an empty IP address.

On the other hand, the test module 150 tests whether the automatically assigned blank IP address operates properly, and runs a web browser to access a specific site to determine whether the set IP address is correct based on the result.

The control module 100 detects that the system is connected to the LAN environment for the first time and controls each module to operate sequentially. The network environment information database 160 corresponds to the subnet name of the IP address set automatically by the initial connection. Store in

Hereinafter, a setting method applied to the automatic IP address setting apparatus having such a configuration will be described in detail with reference to FIGS. 2 and 3.

Referring to FIG. 3, computer systems A, B, and C are interconnected via a LAN 10, and are connected to an external network 20, such as the Internet, via a gateway G. For convenience, assume that the subnet address is "135.5.5", the gateway is "135.5.5.1", and the IP addresses of "135.5.5.10", "135.5.5.11", and "135.5.5.12" are assigned to each computer system shown. Is assigned and describes the case where the user's laptop P is connected to the LAN in this state.

The portable notebook PC is provided with an automatic IP address setting device according to the present invention and is intended to be connected to the LAN 10.

First, when connected to the LAN 10 through the LAN port of the notebook P, the control module 100 detects this and instructs the subnet determination module 110 to automatically determine the subnet.

The subnet determination module 110 sequentially compares network numbers and subnet addresses to ARP packets detected through network sniffing, and statistically analyzes them to determine the most matching number as the subnet address (step S100).

The gateway IP detection module 120 detects an ARP packet and determines an address corresponding to "1" as the gateway IP address from the connection determined as "1: many" (step S200).

In other words, as described above, since a computer system connected to a specific subnet must go through a gateway to be connected to an external network, each computer system sends an ARP packet to the gateway, and the gateway sends an ARP whose IP address is located at the destination. Receiving the packet responds to its own physical network address, so analyzing these ARP packets yields a relationship of "135.5.5.1": multiple IP addresses. Therefore, "135.5.5.1" may be set to the IP address of the gateway.

Subsequently, the empty IP detection module 130 creates a ping packet from the user notebook P to all the computer systems connected to the subnet, broadcasts it, checks for a response, and detects the empty IP address (step S300). .

That is, since there is a response from each of the computer systems A, B, and C, it can be seen that sniffing is detected and IP addresses of "135.5.5.10", "135.5.5.11", and "135.5.5.12" are used. On the other hand, if, for example, "135.5.5.33", "135.5.5.34", etc., do not respond, they are determined to be unused free IP addresses and set to the IP address to be used.

Subsequently, the test module 150 checks whether normal operation is performed by accessing an external network through the set IP address (step S400).

For example, a web browser such as Internet Explorer can be started to connect to any web site. In this case, an additional advertising effect can be obtained by setting any specific web site as the default web site. At this time, if a particular web site is correctly connected, it means that the network environment is properly set.

Optionally, it is checked whether or not to save the set network environment (step S500), and if it is desired to store it, it is stored in correspondence with an appropriate identifier in the network environment information database 160 (step S600).

For example, if the above procedure is performed at company A, the network environment set by using the identifier "company A" as a keyword may be stored. As such, when the network environment is stored, there is an advantage that the stored network environment can be loaded and applied without going through the above procedure when connecting to the same environment.

Although the IP address set to the user is actually assigned to another computer system, the computer may not be used and may be determined as an empty IP address. Therefore, when the computer system is booted, the IP address collides due to the broadcasted ARP packet. Therefore, it is determined whether the IP address is collided through network monitoring (step S700), and if a collision of the IP address is detected, the process returns to the step of detecting an empty IP address and repeats the above procedure to set another empty IP address. do.

Although the above has been described with reference to one embodiment of the present invention, various changes are possible at the level of those skilled in the art. It is obvious that such changes belong to the present invention without departing from the spirit of the present invention.

As described above, according to the present invention, even when connected to any network, there is an advantage that the IP address can be automatically set without the help of the network administrator, and the network administrator does not have to worry about assigning the IP address. It is easy.

In addition, even when a conflict occurs due to the IP address being shared by different users, the IP address can be automatically changed automatically.

In addition, when the network environment is stored once and then connected to the same network environment, there is an advantage that the stored network environment can be loaded and applied.

Moreover, it is simple and inexpensive because no special hardware is required, such as a DHCP server.

In addition, after setting the IP address, the advertisement effect can be indirectly obtained by increasing the page view by allowing a default connection to a specific web site.

Claims (9)

An apparatus for automatically setting an IP address by connecting to a subnet in which a plurality of computer systems are assigned with respective IP addresses, A subnet discrimination module for discriminating a subnet based on ARP packets most statistically matched based on ARP packets transmitted between the respective computer systems through network sniffing; A gateway IP detection module configured to determine, as a gateway IP address, an IP address included in the one ARP packet from a connection defined as a plurality of ARP packets for one ARP packet from the ARP packets; A blank IP detection module that detects a blank IP address by making a ping packet and broadcasting a ping packet to all computer systems connected to the subnet to check for a response; An IP address changing module which monitors whether a collision of another IP address occurs while using the set empty IP address, and automatically changes the set empty IP address to another empty IP address when an ARP packet corresponding to the collision is detected. ; And Automatic IP that detects the first connection to the subnet and controls each module to operate sequentially, the control module for storing the IP address set by the empty IP address detection module in a network environment information database corresponding to a specific identifier Address setting device. delete An apparatus for automatically setting an IP address by connecting to a subnet in which a plurality of computer systems are assigned with respective IP addresses, A subnet discrimination module for discriminating a subnet based on ARP packets most statistically matched based on ARP packets transmitted between the respective computer systems through network sniffing; A gateway IP detection module configured to determine, as a gateway IP address, an IP address included in the one ARP packet from a connection defined as a plurality of ARP packets for one ARP packet from the ARP packets; A blank IP detection module that detects a blank IP address by making a ping packet and broadcasting a ping packet to all computer systems connected to the subnet to check for a response; A test module for testing whether the set blank IP address operates properly, for driving a web browser to access a specific site, and determining whether the set blank IP address is correct based on the result; And Automatic IP that detects the first connection to the subnet and controls each module to operate sequentially, the control module for storing the IP address set by the empty IP address detection module in a network environment information database corresponding to a specific identifier Address setting device. A method of automatically setting an IP address by connecting a plurality of computer systems to a subnet where each IP address is assigned and operated, Sequentially comparing network numbers and subnet addresses to ARP packets detected through network sniffing and statistically analyzing them to determine the most matching number as a subnet address; Detecting the ARP packet and determining, as a gateway IP address, an IP address included in the one packet from a connection defined as a plurality of packets for one packet; Checking whether an operation is normally performed by accessing an external network through the determined IP address; And And generating a ping packet to all computer systems connected to the subnet to broadcast and check whether there is a response, and to set an empty IP address if there is no response. delete The automatic IP address setting method of claim 4, further comprising: checking whether to store the set network environment and storing the network environment in response to an appropriate identifier in a network environment information database. The method of claim 4, wherein the network monitoring determines whether the set IP address collides, and if the collision is detected, returns to the step of detecting the free IP address and repeats the above steps. In a computer program in which a plurality of computer systems are assigned to respective IP addresses and connected to a running subnet, and automatically set an IP address. Sequentially comparing network numbers and subnet addresses to ARP packets detected through network sniffing and statistically analyzing them to determine the most matching number as a subnet address; Detecting the ARP packet and determining, as a gateway IP address, an IP address included in the one packet from a connection determined as a plurality of packets for one packet; A procedure for checking whether an operation is normally performed by accessing an external network through the determined IP address; And And a step of making a ping packet to all computer systems connected to the subnet, broadcasting it, checking whether there is a response, and setting an empty IP address if there is no response. A readable recording medium in a computer that records a computer program in which a plurality of computer systems are assigned a respective IP address and are connected to an operating subnet and automatically set an IP address. Sequentially comparing network numbers and subnet addresses to ARP packets detected through network sniffing and statistically analyzing them to determine the most matching number as a subnet address; Detecting the ARP packet and determining, as a gateway IP address, an IP address included in the one packet from a connection determined as a plurality of packets for one packet; A procedure for checking whether an operation is normally performed by accessing an external network through the determined IP address; And In a computer that records a computer program including a procedure of making a ping packet to all computer systems connected to the subnet, broadcasting it, checking whether there is a response, and setting the empty IP address if there is no response. Readable record carrier.