KR20030007264A - Method and Apparatus for auto changing and setting of internet protocol address - Google Patents

Abstract

PURPOSE: An apparatus for automatically changing and setting an IP(Internet Protocol) address and a method therefor are provided to sense the state of a network in Internet environment and automatically change and set the IP address used by the user to be suitable for the network. CONSTITUTION: If a user inputs an IP address used in an Internet network and association information for connection, a user information input unit(100) receives the IP address and association information. A user information storing unit(200) stores user information inputted through the user information input unit(100). An ARP(Address Resolution Protocol) processing unit(300) transmits an ARP request message about a basic router address from an IP address list stored in the user information storing unit(200) to a system having an IP, receives a response message about the ARP request message, and judges whether the user is currently located in a network. An IP address setup unit(400) reads IP address information stored in the user information storing unit(200) on the basis of network judgement information judged in the ARP processing unit(300), and automatically sets the IP address.

Description

Device and method for automatically changing and setting the Internet protocol address {Method and Apparatus for auto changing and setting of internet protocol address}

The present invention relates to the automatic change / setting of an Internet Protocol address (IP address), and in particular, an Internet protocol address for automatically changing and setting an IP address to be used by a user by detecting a network state in a mobile Internet environment. An automatic change / setting device and a method thereof.

In general, an IP address means a unique identification address given to every communication network connected to the Internet and a computer connected to the communication network.

IP addresses are divided into A, B, and C classes according to the size of the network, that is, the number of computers connected to the network. This is based on the number of bits representing the network address and the address of the computer connected to the network. According to the classification. In other words, Class A consists of 7-bit network address and 24-bit computer address, and is used in communication networks with many computers. Class B consists of 14-bit network address and 16-bit computer address. Class C consists of 21-bit network address and 8-bit computer address.

In addition, class D is defined separately for multicast. The first four bits of the 32-bit address are set to 1110, and the remaining bits are set to identify the multicast group.

IP addresses are assigned by businesses providing services that connect to the Internet, but are actually assigned to end users under the cooperation and management of the Korea Internet Information Center (KRNIC) and the Asia Pacific Internet Information Center (APNIC).

As is well known, the current Internet network uses address systems A, B, and C for routing IP addresses.

Therefore, the user must have an address that corresponds to the access point. If the address is moved to another access point, the user cannot use the existing address and must use the address that matches the current network.

In order to access the Internet, four types of addresses needed to access the Internet must be set up: the address of the current user terminal, the default router address, the subnet mask, and the default DNS address.

Therefore, the user must modify the four pieces of information each time in order to access the Internet from another network each time.

This task is very inconvenient for users who need to travel to various points, and it can be a limitation in the growing public wireless Internet network.

On the other hand, in order to alleviate the inconvenience caused when the IP is set as described above, a method of automatically setting an IP address by selecting an IP address to be used from the user's stored information has been proposed in the related art. Is inconvenient to select the IP address to change.

Accordingly, the present invention has been proposed to solve the inconvenience caused by the user to change and set the IP address in accordance with the network in the conventional mobile Internet environment, as described above,

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for automatically changing / setting an internet protocol address for detecting a network state in a mobile internet environment and automatically changing and setting an IP address that a user should use. .

The present invention for achieving the above object,

It saves the IP address and related information that can be used in the mobile network in advance, and automatically detects the network status and changes the IP address to the corresponding network.

Therefore, when applied in the mobile Internet environment based on notebooks and personal digital assistants (PDAs), which are increasing in the future and in the future, the user can save the hassle of setting an IP address every time, which is convenient for wireless Internet users.

1 is a block diagram showing the configuration of a first embodiment of an apparatus for automatically changing / setting an Internet protocol address according to the present invention;

Figure 2 is a block diagram showing the configuration of a second embodiment of the automatic Internet protocol address change / setting apparatus according to the present invention,

3 is a flowchart illustrating a method of automatically changing / setting an Internet protocol address according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100 ..... User Information Input

200 ..... User information storage

300 ..... Address Resolution Protocol Processing Unit

400 ..... Internet Protocol Address Setting Section

500 ..... Router

600 ..... Router Advertisement Message Receiver

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above.

1 is a block diagram showing the configuration of a first embodiment of an apparatus for automatically changing / setting an Internet protocol address according to the present invention.

Here, reference numeral 100 denotes a user information input unit for receiving the input when the user inputs an IP address to be used in the Internet network and access information, and reference numeral 200 denotes a user storing user information input through the user information input unit. An information storage unit, and reference numeral 300 denotes an IP address resolution protocol (hereinafter, abbreviated as "ARP") request message for the default router address in the IP address list stored in the user information storage unit 200. And an address resolution protocol processor for determining which network a user is currently located in by receiving a response message thereto, and reference numeral 400 denotes network determination information from the address resolution protocol processor 300. Is input to the user information storage unit 200 corresponding thereto. Represents an Internet protocol address setting unit for retrieving and automatically setting IP address information.

In the drawing, reference numeral 500 denotes a router.

The first embodiment of the apparatus for automatically changing / setting an internet protocol address according to the present invention configured as described above first receives an input from the user information input unit 100 when a user inputs an IP address to be used in an internet network and related information for access. Transfer to the user information storage unit 200.

In this case, the user IP address and related information for access are an index number, a network name, a user IP address, a subnet address, a default router address, and a default DNS address.

The user information storage unit 200 stores a user IP address transmitted through the user information input unit 100 and related information for access. That is, the index number, network name, user IP address, subnet address, default router address, and default DNS address are stored as one record.

After storing the information for automatic IP configuration as described above, if the automatic IP configuration function is selected, the ARP request for the default router address of the information stored in the user information storage unit 200 in the address resolution protocol processing unit 300 The message is sent to the router 500.

Here, ARP performs a function of mapping a terminal or system using IP in an IP network with a hardware interface address of the system. That is, when an ARP request message is sent to a system having a specific IP, the system that receives the message sends an ARP response message including its hardware address to the system that sent the ATM request message. Then, the address resolution protocol processing unit 300 receives the response message and analyzes it to determine the location of the network. In other words, if the ARP request message for the default router address is sent from the user-specified IP address list and the response message is checked, it can be seen in which network the current user is located.

When the location of the network is determined in such a manner, the address resolution protocol processor 300 transmits the network location information to the Internet protocol address setting unit 400, and thus, the Internet protocol address setting unit 400 performs the network. Hardware interface information corresponding to the location information is extracted from the user information storage unit 200 and set automatically.

In the above, the hardware address for the default router address of the ARP response message is sent if the user is currently on the network, the correct hardware address is transmitted, otherwise, if the address is different, the hardware address filled with "0" is received or the response message is sent. You will not receive it. In this case, the hardware address is stored internally and can be used as mapping information for the case where the user moves back to the network in the future.

This information can also be used to search from this information to know current network information.

This procedure is repeated until an ARP response is received for the corresponding default router address from the currently stored information. If there is no ARP response for the default router addresses in all lists, it is determined that the user has moved to a new network that has not been set in advance, and the new user information is input and set as the information.

On the other hand, the present invention also provides a function to enable the DHCP, if the moved network is a network using DHCP.

In other words, when set to DHCP, it is limited when there is a DHCP server in the network. Therefore, when the initial user inputs the information on the networks, it is necessary to determine and store whether the current network (or the network to be used in the future) is a DHCP network. After that, after the user's current network is determined by the above ARP message which network is in the network, the information is changed.

Figure 2 is a block diagram showing the configuration of a second embodiment of the automatic Internet protocol address change / setting apparatus according to the present invention.

Here, the configuration of the user information input unit 100, the user information storage unit 200, the Internet protocol address setting unit 400, the router 500 is the same as the configuration of Figure 1, where the basic router 500 periodically Receives a Router Advertisement message to be transmitted and compares the basic router information included in the received RA message with the basic router information stored in the user information storage unit 200 to determine in which network the user terminal is currently located. It comprises a router advertisement message receiving unit 600 to determine the.

According to the second embodiment of the apparatus for automatically changing / setting an internet protocol address according to the present invention configured as described above, first, when a user inputs an IP address to be used in an internet network and related information for access, the user information input unit 100 receives the input information. Transfer to the user information storage unit 200.

In this case, the user IP address and related information for access are an index number, a network name, a user IP address, a subnet address, a default router address, and a default DNS address.

The user information storage unit 200 stores a user IP address transmitted through the user information input unit 100 and related information for access. That is, the index number, network name, user IP address, subnet address, default router address, and default DNS address are stored as one record.

After storing the information for automatic IP configuration as described above, if the automatic IP configuration function is selected, the router advertisement message receiving unit 600 receives a Router Advertisement message (Router Advertisement) messages periodically transmitted by the default router 500 and Then, it compares the basic router information included in the received RA message with the basic router information stored in the user information storage unit 200 to determine in which network the user terminal is currently located.

Thereafter, network location determination information is transmitted to the Internet protocol address setting unit 400. Accordingly, the Internet protocol address setting unit 400 transmits hardware interface information corresponding to the network location information to the user information storage unit 200. ) And automatically set it.

3 is a flowchart illustrating a method of automatically changing / setting an Internet protocol address according to the present invention.

As shown therein, a step (S101) of checking whether user information is input, a step of storing user information if the check result is input (S102), and an automatic address if the user information is not input as a result of the check Checking whether it is designated (S103); if the check result address is automatically designated, checking whether there is stored user information (S104); and if the stored user information does not exist as a result of the check, requesting user information input And transmitting the ARP request message for the default router address of the first address in the stored address list when the user information is stored (S106), and transmitting the ARP request message after sending the ARP request message. Checking whether or not the reception (S107) and, if the response message is not received during the check result set time Check whether it is the last address, if it is the last address, move to the user information input request step (S105); if not, move to the ARP request message transmission step (S106); In response to the check result receiving a response message, analyzing the response message to determine the network location (S109), and checking whether the hardware interface address corresponding to the determined network exists and if the hardware interface address does not exist as a result of the check. Returning to the user information input request step (S105) (S110), and if the hardware interface address exists as a result of the check step of setting the interface automatically using the information (S111).

The automatic Internet protocol address change / setting method according to the present invention as described above first checks whether user information is input in step S101, and if the user information is input as a result of the check, it stores it in step S102.

If the check result is not inputting user information, go to step S103 to check whether the address is automatically designated. If the check result is not automatically assigned, return to step S101 of checking whether the user information is input. In contrast, in the case of automatic address assignment, it is checked whether user information stored in step S104 exists.

If the stored user information does not exist as a result of the checking, go to step S105 to request the user information input. Send an ARP request message.

Thereafter, in step S107, it is checked whether a response message is received after the transmission of the ARP request message. If no response message is received during the check result setting time, the process moves to step S108 to check whether it is the last address. If the user information input request step (S105), and if not the last address, the ARP request message transmission step (S106).

On the other hand, if a response message is received, the process moves to step S109 to analyze the response message to determine the network position. When the network position determination is finished, it is checked in step S110 whether a hardware interface address corresponding to the determined network exists. If the hardware interface address does not exist as a result of the check, it returns to the user information input request step S105. If the hardware interface address exists as a result of the check, the interface is automatically set using the information in step S111.

According to the present invention described above, there is an effect to enable access to the Internet network without additional setup of the user in a number of networks having a non-contiguous network configuration.

In addition, there is an effect that provides the user with convenience in mobility services in the access network using the current wireless LAN and related technologies.

Claims (5)

In the Internet protocol address setting apparatus, A user information input unit for inputting an IP address to be used in the Internet and related information for access; A user information storage unit for storing user information input through the user information input unit; From the list of IP addresses stored in the user information storage unit, an address resolution protocol (ARP) request message for a default router address is transmitted to a system having an IP, and a response message is received to determine in which network the current user is located. An address resolution protocol processor to determine; And an Internet protocol address setting unit configured to automatically retrieve and automatically set IP address information corresponding to the user information storage unit based on the network determination information determined by the address resolution protocol processing unit. / Setting device. The method of claim 1, wherein the IP address and related information for accessing the network are: Device for automatically changing / setting an Internet protocol address, which is an index number, a network name, a user IP address, a subnet address, a default router address, and a default DNS address. In the Internet protocol address setting device, A user information input unit for receiving input when a user inputs an IP address to be used in the Internet and related information for access; A user information storage unit for storing user information input through the user information input unit; Receives a Router Advertisement message periodically transmitted by the default router, and compares the basic router information included in the received RA message with the basic router information stored in the user information storage unit. A router advertisement message receiving unit for determining whether or not it is located; And an internet protocol address setting unit configured to automatically retrieve and set IP address information corresponding to the user information storage unit based on the network determination information determined by the router advertisement message receiving unit. Setting device. In the Internet protocol address setting method, Checking whether the user information is input and storing the user information if the user information is input; Checking whether the address is automatically designated when the user information is not input, and checking whether the stored user information exists when the address is automatically designated; Requesting user information input if there is no stored user information as a result of the checking; If the user information is stored as a result of the checking, transmitting an ARP request message for a default router address of the stored address; Checking whether a response message is received after transmitting the ARP request message; Determining a network location by analyzing a response message when a response message is received as a result of the check; It is checked whether a hardware interface address corresponding to the determined network exists, and if the hardware interface address does not exist as a result of the check, it returns to the user information input request step, and automatically uses the information if the hardware interface address exists. Internet protocol address automatic change / setting method comprising the step of setting the interface. The method according to claim 4, wherein if the response message is not received during the set time, it is checked whether the response address is the last address. If the response message is the last address, the terminal moves to the user information input request step. If not, the Internet protocol address automatic change / setting method further comprising the step of moving to the ARP request message transmission step to transmit the ARP request message for the next address.