KR100487296B1 - a system for supporting movement of host computer and method therefor - Google Patents

Abstract

The present invention relates to a system and method for supporting host mobility in an Internet network that can utilize a DHCP mechanism regardless of the presence or absence of a DHCP server by implementing a DHCP server in a mobile host, the server module An internet information database storing network information such as an authorized IP address, a subnet mask, and a gateway address; An error processing unit for discarding abnormal data that cannot be normally processed for an address allocation request; A message analysis processing module for analyzing a message received from a client, extracting a message and client related information, and responding to the message according to the extracted information; A data receiving unit for receiving a message from a client; A data transmitter for outputting a message generated by the message analysis processing module to the Internet; A protocol processing unit for transmitting and receiving a message transmitted and received with the client by a communication protocol; It consists of a network interface unit that interfaces with the Internet with a server and client IP address, and the client module is configured with the Internet information database excluded from the server module and the addition of the assigned address binding unit to utilize the DHCP mechanism even if there is no DHCP server in the network. This makes it easy to set IP addresses by eliminating the need to restart the computer for binding when changing TCP / IP settings.

Description

System and supporting movement of host computer and method therefor}

The present invention relates to a system and a method for supporting host mobility in the Internet network, and more particularly, to implement a DHCP server in a mobile host to move on any network regardless of the presence or absence of a DHCP server can utilize a DHCP mechanism A system and method for supporting host mobility in an internet network.

Dynamic Host Configuration Protocol (DHCP) is a protocol that dynamically assigns IP (Internet Protocol) addresses or configuration parameters to clients operating on a local area network (LAN). This makes it easy to manage and assign IP addresses.

The DHCP mechanism is implemented in the server and client environment, and the communication method between the server and client is message based. In other words, the DHCP server with the static IP address responds to the IP address request message from the DHCP client with the dynamic IP. The client is the one requesting the IP address, like a regular PC or laptop, and the server is the one that allocates the IP address appropriately. The exchange of messages between a DHCP server and a client begins when the DHCP server manages an IP pool, which is a set of IP addresses that it is defined to manage, and receives a message from the client requesting to lease an IP address. do. The interaction order for the client to be assigned an address from the server is shown in FIG. 1, and the interaction order and message are as follows.

DHCPDISCOVER: message from client requesting server IP address

(B) DHCPOFFER: The DHCP server responds to the DHCPDISCOVER message by creating a message containing the IP address and other information (DNS server address, gateway address, etc.) that it can lend.

(D) DHCPREQUEST: A message that tells a server what server it chooses by determining which server the client will borrow its IP address from.

(D) DHCPACK: A message that finally informs the server that it will borrow a specific IP address and other configuration parameters from the client.

There is nothing you need to do to set an IP address for your notebook computer on a network with a DHCP server. The user simply connects the LAN cable to the notebook and starts up the notebook and exchanges messages between the DHCP server and the notebook, automatically assigning an IP address, and the assigned IP address is dynamically bound to the operating system.

In other words, if all the networks are running a DHCP server, and dynamic IP address assignment, there is no inconvenience in using the Internet as a mobile host, such as a notebook computer, no matter where you go. However, most networks use a static IP assignment method, so many networks do not have a DHCP server running. Therefore, in order to set an IP address for a user to use the Internet on a network (a network without a DHCP server), two tasks must be performed.

(A) You must enter TCP / IP information such as the IP address, gateway address, and subnet mask available at your location. In other words, the user should remember all the TCP / IP information of each place and have to enter manually.

(B) You must restart your notebook computer to bind the entered TCP / IP information. This is because the input of TCP / IP information is not yet bound to the operating system and therefore the Internet cannot be used.

On a network without a DHCP server, changing the notebook's IP address puts the user on the task of entering TCP / IP information for each location and restarting the notebook computer.

While the DHCP mechanism is convenient, it operates on a client / server basis as described above. Therefore, a DHCP server must be present on the network in which the client operates to utilize the convenience of the DHCP mechanism. have.

The present invention is to solve the conventional problems as described above,

It is an object of the present invention to implement a DHCP server on the computer itself and to assign an IP address to a client so that the user can use the DHCP mechanism regardless of the presence of a DHCP server where the user moves to the Internet to enable communication with the Internet. The present invention provides a system and method for supporting host mobility in a network.

Another object of the present invention is a system that supports host mobility in the Internet network, which saves the trouble of binding the Internet address by implementing a DHCP server-client mechanism using a loopback address in the computer itself even if there is no DHCP server in the user's movement. And a method thereof.

It is still another object of the present invention to provide a system and method for supporting host mobility in an Internet network that can overcome the limitations in utilizing a DHCP mechanism to support host mobility.

In order to achieve the above object, the system according to the present invention includes a server module and a client module in one computer, and the server module operates as a local host or a virtual host.

The server module when operating as a local host includes: an Internet information database storing network information such as an authorized IP address, subnet mask, gateway address, and the like; An error processing unit for discarding abnormal data that cannot be normally processed for an address allocation request; A message analysis processing module for analyzing a message received from a client, extracting a message and client related information, and responding to the message according to the extracted information; A data receiving unit for receiving a message from a client; A data transmitter for outputting a message generated by the message analysis processing module to the Internet; A protocol processing unit for transmitting and receiving a message transmitted and received with the client by a communication protocol; It consists of a network interface unit that interfaces with a network with a loopback IP address,

The client module excludes the Internet information database from the server module and adds an assignment address binding unit. The assignment address binding unit combines the IP address and network related information allocated from the server module to the system to access the Internet.

The configuration of the server module and the client module when operating as a virtual host has a different configuration than when operating as a local host in that each includes a network interface unit.

The configuration and operation of the present invention will be described in detail through one embodiment.

2 is a block diagram of a DHCP server and a client configured to be run in the same computer according to the present invention.

The system according to the present invention includes a server module 20 and a client module 20 'in one computer 100.

In the server module 20, the Internet information database 21 stores network information such as an authorized IP address, subnet mask, gateway address, and the like. The error processing unit 22 discards abnormal data that cannot be normally processed for the address assignment request from the client module 20 '. The message analysis processing module 23 analyzes a message received from the client module 20 ', extracts a message and client related information, and responds to the message according to the extracted information. The data receiver 24 receives a message from the client module 20 '. The data transmitter 25 transmits the message generated by the message analysis processing module 23 onto the network. The protocol processor 26 transmits and receives a message transmitted and received between the client module 20 'and a communication protocol. The network interface unit 27 interfaces with the Internet 200 with a loopback IP address (127.0.0.1).

The client module 20 'has the same configuration as the server module 20 but is configured by adding an assignment address binding unit 32 except for the Internet information database 21. The error processing unit 28 discards abnormal data that cannot be normally processed for the address allocation request from the server module 20. The message analysis processing module 29 analyzes a message received from the server module 20 ', extracts a message and server related information, and responds to the message according to the extracted information. The data transmitter / receiver 25/24 transmits / receives a message from the server module 20. The protocol processor 26 transmits and receives a message transmitted and received between the server module 20 and a communication protocol. The assignment address binding unit 33 couples the IP address and network related information allocated from the server module 20 to the system to be connected to the Internet 200.

As presented in the present invention, a local host IP address (127.0.0.1) is used as a communication method between a DHCP server and a DHCP client existing in one computer, and an Internet address is allocated using the DHCP mechanism. FIG. 3 (a) shows a process diagram illustrating a procedure for implementing a DHCP mechanism between a server and a client configured in the system of FIG. 2, and FIG. 3 (b) shows a DHCP mechanism between a server and a client configured in the system of FIG. A flowchart illustrating a method of controlling to implement is shown.

The client module 20 'broadcasts a DHCPDISCOVER message requesting an IP address rental through the network interface unit 27, at which time the message is also transmitted to the local host server module 20 (step S31). The local host server module 20 receives the DHCPDISCOVER message from the client module 20 'via the network interface unit 27 using the loopback IP address information "127.0.0.1" (step S32). Upon receiving the DHCPDISCOVER message, the local host server module 20 reads an IP address suitable for the current situation from the Internet address database 21 and sends a DHCPOFFER message "127.0.0.1 through the network based on the received local host IP address information." "To unicast" (step S33). The client module 20 'extracts the assigned IP address and configuration parameters from the DHCPOFFER message received through the network interface unit 27 and broadcasts a DHCPREQUEST message through the network interface unit 27 (step S34). The local host server module 20 transmits a DHCPACK message as a unicast message with respect to the broadcast DHCPREQUEST message (step S35). After receiving the DHCPACK message, the client module 20 'binds the allocated IP address and configuration parameter information to its own system (step S36).

4 is a block diagram showing the configuration of a system in which a server module and a client operating as a virtual host according to the present invention are configured in the same computer to implement a DHCP mechanism.

The configuration of the server module 40 operating as a virtual host is substantially the same as that of the server module 20 operating as a local host, and differs in that the network interface unit 48 is not shared with the client module. Similarly, the configuration of the client module 40 'is also substantially the same as the client module 20' when using the local host method, and differs in that the network interface unit 55 is not shared with the client module.

The exchange of messages between the client and server takes place using the virtual host. After the network interface units 48 and 55 are virtually installed in the notebook computer, the TCP / IP stack is bound to the network interface units 48 and 55 to drive the virtual host. By assigning a virtual private IP to the bound TCP / IP stack, the virtual host runs as a DHCP server. The DHCP server can therefore be run using this private IP address to respond to messages from DHCP clients. A DHCP server running using a virtual host on a notebook computer exchanges messages with clients in the following ways:

FIG. 5A is a procedure diagram illustrating a procedure for implementing a DHCP mechanism between a virtual host server and a client configured in the system of FIG. 2, and FIG. 5B implements a DHCP mechanism between a virtual host server and a client configured in the system of FIG. 2. A flowchart is shown that illustrates how to control to do so.

The client module 40 'transmits a DHCPDISCOVER message requesting the IP address rental through the network interface unit 55 to the virtual host server module 40 via the network 200 to broadcast it (step S51). The virtual host server module 40 assigns the virtual host IP address to the loopback IP address "127.0.0.1" and receives a DHCPDISCOVER message from the client module 40 'through port 67 (step S52). The virtual host server module 40 reads an IP address suitable for the current situation from the Internet address database 41 based on the received virtual host IP address information, and reads a DHCPOFFER message as "127.0.0.1" through the network. Cast (step S53). The client module 40 'extracts the assigned IP address and configuration parameters from the DHCPOFFER message received through the Internet 200 and the network interface unit 55, and then broadcasts a DHCPREQUEST message to the virtual host server module 40. (Step S54). The virtual host server module 40 transmits a DHCPACK message as a unicast message with respect to the broadcast DHCPREQUEST message (step S55). After receiving the DHCPACK message, the client module 40 'binds the allocated IP address and configuration parameter information to its own system (step S56).

In order to utilize the server / client-based DHCP mechanism even on a network where no DHCP server exists, the DHCP mechanism can be utilized by configuring the DHCP server and the DHCP client in the same computer to interoperate.

As described above, according to the present invention, a DHCP server is configured in a network using a driving method using local host information and a method using a virtual host. You can take advantage of the DHCP mechanism even if it doesn't exist. In addition, when changing TCP / IP settings, it is not necessary to restart the computer for binding, which makes the IP address setting convenient.

1 is a flowchart illustrating an operation for a client to be assigned an address from a server by DHCP.

2 is a block diagram of a DHCP server and a client configured to run in the same computer according to the present invention;

3A is a procedure diagram illustrating a procedure for implementing a DHCP mechanism between a server and a client configured in the system of FIG. 2;

3B is a flowchart illustrating a method of controlling to implement a DHCP mechanism between a server and a client configured in the system of FIG. 2;

4 is a block diagram showing the configuration of a system in which a server module and a client operating as a virtual host according to the present invention are configured in the same computer to implement a DHCP mechanism;

5A is a procedure diagram illustrating a procedure for implementing a DHCP mechanism between a virtual host server and a client configured in the system of FIG. 2;

FIG. 5B is a flowchart illustrating a method of controlling to implement a DHCP mechanism between a virtual host server and a client configured in the system of FIG. 2.

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

20: server module 20 ': client module

21: Internet address database 22, 28: error handling unit

23, 29: message analysis processing module 24, 30: data receiving unit

25, 31: data transmitter 26, 32: protocol processor

27: network interface unit 33: allocation address binding unit

100, 300: Computer 200: Internet

Claims (5)

Have a server module and a client module on one computer, The server module, An Internet information database for storing network information related to public IP address allocation, such as a public IP address, subnet mask, and gateway address; A message analysis processing module for parsing the public IP address allocation request related message of the client module and reading the public IP address related network information corresponding thereto from the internet information database to generate a response message; A protocol processing unit for processing a series of messages transmitted and received between the client modules, including a response message generated by the message analysis processing module, to be transmitted and received by a predetermined communication protocol; The message generated by the message analysis processing module is a protocol processing unit, and the message processed by the protocol processing unit is composed of a data transmitter and a data receiver for outputting the message analysis module, respectively, The client module, Among the components of the server module, a message analysis processing module, a protocol processing unit, a data transmitting unit and a data receiving unit, including an allocation address binding unit for binding the network information related to the public IP address provided by the server module is configured, The server module and client module, A system supporting host mobility in an Internet network, characterized in that a message interface is connected to a network interface unit for interfacing message transmission / reception using a loopback IP address. The method of claim 1, wherein the server module and the client module; And an error processing unit for discarding the data according to abnormality of the data parsed by the message analysis processing module. The client module broadcasting a DHCPDISCOVER message requesting a public IP address rental through a server module having a loopback IP address or a virtual host address, wherein the server module is included in a specific device in which the client module is embedded; The server module receiving a DHCPDISCOVER message from the client module via a loopback IP address or a virtual host address; The server module reads a public IP address and network-related configuration parameters to be assigned to the client module from a storage area set in the specific device, and puts them in a DHCPOFFER message to unicast to the client module through a loopback IP address or a virtual host address. step; The client module parsing the transmitted DHCPOFFER message via a loopback IP address or virtual host address to read a public IP address and network related configuration parameters, and broadcasting a DHCPREQUEST message; The server module unicasting a DHCPACK message to the broadcast DHCPREQUEST message; Binding, by the client module, the allocated IP address and configuration parameters after receiving a DHCPACK message. [4] The host mobility of the Internet network according to claim 3, wherein the local host information (loopback IP address) is set to 127.0.0.1 to run a DHCP server or a DHCP server based on a virtual host address. How to support. Have a server module and a client module in one computer, The server module, An Internet information database for storing network information related to public IP address allocation, such as a public IP address, subnet mask, and gateway address; A message analysis processing module for parsing the public IP address allocation request related message of the client module and reading the public IP address related network information corresponding thereto from the internet information database to generate a response message; A protocol processing unit for processing a series of messages transmitted and received between the client modules, including a response message generated by the message analysis processing module, to be transmitted and received by a predetermined communication protocol; A data transmitter and a data receiver configured to output a message generated by the message analysis processing module to a protocol processor, and output a message processed by the protocol processor to the message analysis processing module, respectively; And a virtual network interface unit for interfacing the message processed by the protocol processor with the client module using a pre-bound virtual host address. The client module, Among the components of the server module, a message analysis processing module, a protocol processing unit, a data transmitting unit and a data receiving unit, including a virtual network interface unit, the assigned address binding the network information related to the public IP address provided by the server module A system for supporting host mobility in an Internet network, characterized in that the binding unit is added.