KR20060071093A - Apparatus and method for using of private internet protocol in internet protocol keyphone system - Google Patents

Abstract

The present invention provides an apparatus and method for using a private IP of an IP keyphone system, comprising: an IP for performing IP processing at a network layer of the IP keyphone system; A private IP controller connected to the IP and controlling a private IP address located at a network layer to control the private IP; An ICMP connected to the private IP controller and positioned at a network layer to perform ICMP processing; By including the ARP connected to the IP and located in the link layer to perform ARP processing, a large number of private IPs are used to use IPs outside the IP range defined in the server. Even if you are not able to use it, you will be able to use private IP optimally.

Description

Apparatus and method for using of private internet protocol in internet protocol keyphone system}

1 is a block diagram of a general IP key phone system,

2 is a block diagram of an ARP answering device of a conventional IP key phone system;

3 is a flowchart illustrating an ARP response method of a conventional IP key phone system;

4 is a block diagram showing an operation flow when an ARP request is equal to an IP address of a device when the method of FIG. 3 operates in FIG.

FIG. 5 is a block diagram showing an operation flow when an ARP request is different from an IP address of a device when the method of FIG. 3 operates in FIG.

6 is a block diagram illustrating a private IP using apparatus of the IP key phone system according to the present invention;

7 is a flowchart showing a method of using a private IP of an IP keyphone system according to the present invention;

FIG. 8 is a block diagram illustrating a flow of the method of FIG. 7 operating in FIG. 6.

Explanation of symbols on the main parts of the drawings

1: security server 2: IP keyphone exchange                 

3, 4: terminal 5, 6, 7: user terminal

21: TCP 22: UDP

23: ICMP 24: IP

25: IGMP 26: ARP

27: Ethernet driver 28: RARP

30: private IP controller

The present invention relates to an apparatus and method for using a private IP (Internet Protocol) of an IP key phone system, and in particular, a large number of private IPs are used to use an IP outside the IP range defined in the server. The present invention relates to an apparatus and method for using a private IP of an IP key phone system, which is suitable for optimal use of the private IP even in a situation where the use of the IP address is prevented.

In general, an IP key phone system is an efficient simple switching system designed to be used by several people simultaneously by installing a limited trunk line in a key phone main device and connecting a key phone and a general telephone. The IP key phone system may be connected to a trunk line and an extension to perform a voice guidance function, interrupting function, broadcasting function, reception rejection function, remote maintenance function, and the like.

1 is a block diagram of a general IP key phone system.                         

Here, reference numeral 1 is a security server, 2 is an IP keyphone switch, 3 and 4 are terminals, and 5 to 7 are user terminals.

Therefore, the security server 1 is a security-related server used in the office, and performs a blocking function for IPs other than the registered IP.

The IP Keyphone Switch is also the main process unit of the IP Key System.

Further, the first terminal 3 and the second terminal 4 are IP key phones using private IP.

In addition, the first user terminal 5, the second user terminal 6, and the third user terminal 7 show a case in which an authenticated IP is used as a PC on which a personal computer (PC) phone is installed.

2 is a block diagram of an ARP answering device of a conventional IP key phone system.

This is the application of Transmission Control Protocol / Internet Protocol (TCP / IP) to the seventh layer of the International Standard Organization (ISO).

In this case, a user process operates in the application layer.

In addition, reference numeral 11 denotes a Transmission Control Protocol (TCP) operating in a transport layer, 12 denotes a User Datagram Protocol (UDP) operating in a transport layer, and 13 ICMP (Inter Control Message Protocol) operates at the Network Layer, 14 is Internet Protocol (IP) at the network layer, and 15 is IGMP (Internet) at the network layer. Group Management Protocol), 16 is the Address Resolution Protocol (ARP) operating at the Link Layer, 17 is the Ethernet Driver operating at the Link Layer, 18 Is Reverse Address Resolution Protocol (RARP) that operates at the link layer.

3 is a flowchart illustrating an ARP response method of a conventional IP key phone system.

As shown in the drawing, when data to be transmitted is transmitted to the IP 14 layer by attaching a TCP header, if there is no MAC (Media Access Control) address for the IP address, the ARP (16) protocol layer is used. A first step (ST1 to ST5) of calling and broadcasting an ARP request message to confirm whether each device is equal to the device's IP address with respect to the ARP request; A second step (ST6) of transmitting an ARP response including the device MAC address to the requested MAC address if the same as the IP address of the device in the first step; A third step (ST7) of attaching a specific router or server or an unused MAC address and transmitting an ARP response if it is different from the IP address of the device in the first step; After the second or third step, a MAC address for the corresponding IP address to be searched is returned, a MAC address and an IP address are set, and a fourth step (ST8) (ST9) of transmitting an IP packet is performed.

Referring to the operation of the prior art configured as described above in detail with reference to the accompanying drawings as follows.

First, FIG. 4 is a block diagram showing an operation flow when an ARP request is equal to an IP address of a device when the method of FIG. 3 operates in FIG.

Referring to Figure 4 describes the operation of the prior art as follows.

1) A TCP header is attached to the data to be sent and sent to the IP layer 14 (ST1).

2) If there is no MAC address for the corresponding IP address, the ARP 16 protocol layer for obtaining the MAC address is called (ST2).

3) The ARP request message is broadcast to obtain the MAC address for the corresponding IP address to be found (ST3).

4) Each device checks whether the ARP request is the same as the device's IP address (ST4).

5) So it is determined whether it is the same as the IP address of the device (ST5).

6) If it is the same as the IP address of the device, the device MAC address is attached to the requested MAC address and an ARP Reply is transmitted (ST6).

7) Return the MAC address for the corresponding IP address to be found (ST8).

8) Set MAC address and IP address and transmit IP packet (ST9).

FIG. 5 is a block diagram showing the operation flow when the ARP request is different from the IP address of the device when the method of FIG. 3 operates in FIG.

Referring to Figure 5 describes the operation of the prior art as follows.

This is a description of the operation when the security server erroneously retrieves the device's MAC address information.

1) A TCP header is attached to the data to be sent and sent to the IP layer 14 (ST1).

2) If there is no MAC address for the corresponding IP address, the ARP 16 protocol layer for obtaining the MAC address is called (ST2).

3) The ARP request message is broadcast to obtain the MAC address for the corresponding IP address to be found (ST3).

4) Each device checks whether the ARP request is the same as the device's IP address (ST4).

5) So it is determined whether it is the same as the IP address of the device (ST5).

Up to this point, operations 1) to 5) are the same as those in FIG. 4.

6) The security server 1 responds with a specific router or server or an unused MAC address when the IP address is not registered or authenticated even if it is not its IP address. At this time, the device of the corresponding IP address also responds with its own MAC address (ST7).

7) For the arrived ARP response, depending on the implementation, return the first or last MAC address (ST8).

8) Set MAC address and IP address and transmit IP packet (ST9).

However, this conventional technology has the following problems.

In other words, when an incorrect MAC address is transmitted from a security server or other server, data cannot be transmitted.                         

This is not a problem in a general situation, but when a terminal registered in the system uses a private IP, such as in the case of an IP keyphone system, when the authentication area of the security server or other server is crossed, communication between terminals cannot be made. There is a problem that occurs.

Therefore, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to use an IP other than the IP range defined in the server by using a large amount of private IP, so that this IP is used in specific servers. Disclosure of the Invention The present invention provides an apparatus and method for using a private IP of an IP keyphone system that can optimally use private IP even in a situation where an address cannot be used.

In order to achieve the above object, the private IP using apparatus of the IP keyphone system according to an embodiment of the present invention,

An IP for performing IP processing at a network layer of the IP keyphone system; A private IP controller connected to the IP and controlling a private IP address located at a network layer to control the private IP; An ICMP connected to the private IP controller and positioned at a network layer to perform ICMP processing; The technical configuration is characterized in that it comprises an ARP connected to the IP, located in the link layer to perform ARP processing.

Method of using a private IP of the IP key phone system according to an embodiment of the present invention to achieve the above object,

When the data to be transmitted is sent to the IP layer with a TCP header, if the MAC address for the IP address does not exist, the ARP protocol layer is called to broadcast an ARP request message, and each device sends an IP address of the device to the ARP request. An eleventh step of confirming whether the address is the same; A twelfth step of transmitting an ARP response including the device MAC address to the requested MAC address if it is the same as the IP address of the device in the eleventh step; A thirteenth step of transmitting an ARP response with a specific router or server or an unused MAC address if different from the IP address of the device in the eleventh step; A fourteenth step of returning a MAC address for the corresponding IP address to be found after the twelfth or thirteenth step and then determining whether the IP address is a private IP address; If the private IP address in the fourteenth step, and the fifteenth step of performing a private IP address processing by calling the ping program is characterized in that the technical configuration.

Hereinafter, an embodiment according to the present invention as described above, an apparatus for using a private IP of an IP key phone system, and a method thereof will be described with reference to the accompanying drawings.

6 is a block diagram illustrating a private IP using apparatus of the IP key phone system according to the present invention.

As shown therein, an IP 24 for performing IP processing at the network layer of the IP keyphone system; A private IP controller (30) connected to the IP (24) and controlling a private IP address located at a network layer to control the private IP; An ICMP (23) connected to the private IP controller (30) and positioned at a network layer to perform ICMP processing; It is configured to include an ARP 26 connected to the IP 24 and located in a link layer to perform ARP processing.

The private IP controller 30 requests a ping (Packet InterNet Groper, Packet Internet Gripper, PING) from the ICMP 23 if the IP address is a private IP address.

The private IP controller 30 includes a bad MAC address and a timeout value of the ARP 26 corresponding thereto, and includes a good MAC address and a corresponding ARP ( And a timeout value of 26).

Here, reference numeral 21 is TCP at the transport layer, 22 is UDP at the transport layer, 25 is IGMP at the network layer, 27 is an Ethernet driver at the link layer, which performs a hardware interface, and 28 is at the link layer. RARP.

7 is a flowchart illustrating a method of using private IP in an IP key phone system according to the present invention.

As shown here, if the data to be transmitted is transmitted to the IP layer 24 with a TCP header, if the MAC address for the IP address does not exist, the ARP 26 protocol layer is called to broadcast an ARP request message. An eleventh step (ST11 to ST15) for confirming whether each device is equal to the IP address of the device with respect to the ARP request; A twelfth step (ST16) of transmitting an ARP response including the device MAC address to the requested MAC address if it is the same as the IP address of the device in the eleventh step; A thirteenth step (ST17) of attaching a specific router or server or an unused MAC address and transmitting an ARP response if the IP address of the device is different from the eleventh step; A fourteenth step (ST18) (ST19) of determining whether the IP address is a private IP address after returning the MAC address for the corresponding IP address to be found after the twelfth step or the thirteenth step; If it is the private IP address in the fourteenth step, a fifteenth step (ST20 to ST27) of calling a ping program to perform private IP address processing is performed.

The fifteenth step may include a twenty-first step (ST20) of calling a ping program of the ICMP (23) using the MAC address and the IP address obtained from the ARP response if the private IP address is used in the fourteenth step; A twenty-second step (ST21) (ST22) for determining whether a MAC exists in the MAC list after the twenty-first step; After the twenty-second step, a ping message is transmitted to the device that has sent the ARP response; Wow; A twenty-fourth step (ST26) if the ping response arrives normally, including the MAC address in the Good MAC List; And a twenty-fifth step ST27 for transmitting a message using the MAC address obtained after the twenty-fourth step.

The step 22 may include returning to the eleventh step if the MAC exists in the bad MAC list after the twenty-first step (ST21); Returning to the twenty-fifth step if the MAC exists in the good MAC list after the twenty-first step (ST22); If there is no MAC in the MAC list after the twenty-first step, the method returns to the twenty-third step.

The operation of the private IP using apparatus and method of the IP key phone system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, in the IP key phone system, a private IP address is used, and specific servers use a method of preventing the MAC address of an unauthenticated IP address from the ARP 26 by sending a MAC of a gateway or a security server.

In this case, the IP key phone system may receive a MAC address sent by an actual device and a MAC address sent by a server, and the present invention relates to a technology for distinguishing the same.

Therefore, the present invention intends to use private IP optimally even in a situation where a large amount of private IP is used to use an IP other than the IP range defined in the server, and this server is prevented from using this IP address.

Thus, the private IP controller 30 controls the private IP address.

Herein, the private IP address refers to an IP address other than the IP address range determined by the IP address and the net mask set in the corresponding device.

The members included in the private IP controller 30 include 1) a bad MAC address list and a timeout value for each ARP, and 2) a good MAC address list and a timeout value for each ARP.

In addition, the private IP controller 30 requests a ping from the ICMP 23 if the IP address is a private IP address.

Ping here is a basic Internet program that checks to see if there is a particular Internet address and that it can accept requests. This ping is used for diagnostic purposes to verify that the host you are trying to connect to is actually running. For example, if a user can't ping a host (that is, the response to the ping is not normal), the user can use the FTP (File Transfer Protocol) protocol to send files to that host. Will not be available. Ping can also be used to determine how fast a running host responds, or it can find the IP address of any site that only knows the domain name.

FIG. 8 is a block diagram illustrating a flow of the method of FIG. 7 operating in FIG. 6.

Referring to Figure 8 described the operation of the present invention.

1) The TCP header is attached to the data to be sent and sent to the IP layer 24 (ST11).

2) If there is no MAC address for the corresponding IP address, the ARP 26 protocol layer for obtaining the MAC address is called (ST12).

3) The ARP request message is broadcast to obtain the MAC address for the corresponding IP address to be found (ST13).

4) Each device checks whether the ARP request is the same as the device's IP address (ST14).

5) Then, it is determined whether it is the same as the IP address of the device (ST15).                     

6) If it is the same as the IP address of the device, the device MAC address is attached to the requested MAC address and an ARP Reply is transmitted (ST16).

7) The security server responds with a specific router or server or an unused MAC address if the IP address is not registered or authenticated even if it is not its own. At this time, the device of the corresponding IP address also responds with its own MAC address (ST17).

8) Then, return the MAC address for the corresponding IP address to be found (ST18).

9) Then, it is determined whether the IP address is a private IP address (ST19).

10) If it is a private IP address, the ping program of the ICMP 23 is called using the MAC address and IP address obtained from the ARP response.

11) If there is a MAC obtained from the bad MAC list, the process starts again from step 2) (ST21).

12) If the MAC obtained from the good MAC list exists, the function of step 17) is immediately performed (ST22).

13) The ping message is transmitted to the device which sent the ARP response (ST23).

14) If the ping message matches the information of the device receiving the message, an echo reply is sent (ST24).

15) Then it is determined whether the response of the ping arrives normally (ST25).

16) If the ping's response is not normal, put it in the bad MAC list and repeat from step 2). In addition, if the response of the ping arrives normally, the MAC address obtained in step 8) is put in the good MAC list and step 17) is performed (ST26).

17) The message is transmitted using the obtained MAC address (ST27).

For the number of other iterations or the timeout value, use the value used in the existing ARP list.

As such, the present invention uses an IP outside the IP range defined in the server by using a large amount of private IP, so that the private IP is optimally used even in a situation where it is prevented from using this IP address in specific servers.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. That is, when using a private IP address in the IP exchange system through the present invention, it is possible to implement the message transmission between each terminal, adding only the portion to perform the private IP address control without changing the existing structure. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the apparatus and method for using a private IP of the IP key phone system according to the present invention uses a large amount of private IP to use an IP other than the IP range defined in the server, so that this IP address is used in specific servers. Even if it is prevented from being used, private IP can be used optimally.                     

In addition, the present invention also has the effect of enabling access to the private IP address without changing the configuration of the server or adding a server when using a large number of private IP addresses, such as IP key phone system.

Claims (6)

An IP for performing IP processing at a network layer of the IP keyphone system; A private IP controller connected to the IP and controlling a private IP address located at a network layer to control the private IP; An ICMP connected to the private IP controller and positioned at a network layer to perform ICMP processing; And an ARP connected to the IP and positioned at a link layer to perform ARP processing. The method of claim 1, wherein the private IP control unit, And if the IP address is a private IP address, requesting a ping from the ICMP. The private IP controller of claim 1, wherein the private IP controller comprises: And a bad MAC address and a timeout value of the ARP corresponding thereto, and a good MAC address and a timeout value of the ARP corresponding thereto. When the data to be transmitted is sent to the IP layer with a TCP header, if the MAC address for the IP address does not exist, the ARP protocol layer is called to broadcast an ARP request message, and each device sends an IP address of the device to the ARP request. An eleventh step of confirming whether the address is the same; A twelfth step of transmitting an ARP response including the device MAC address to the requested MAC address if it is the same as the IP address of the device in the eleventh step; A thirteenth step of transmitting an ARP response with a specific router or server or an unused MAC address if different from the IP address of the device in the eleventh step; A fourteenth step of returning a MAC address for the corresponding IP address to be found after the twelfth or thirteenth step and then determining whether the IP address is a private IP address; And a fifteenth step of performing a private IP address process by calling a ping program if the private IP address is set in the fourteenth step. The method of claim 4, wherein the fifteenth step comprises: A twenty-first step of calling a ping program of ICMP using the MAC address and IP address obtained in the ARP response if the private IP address is in the fourteenth step; A twenty-second step of determining whether there is a MAC in the MAC list after the twenty-first step; A twenty-third step of transmitting a ping message to the device that has sent the ARP response after the twenty-second step; transmitting a response if the ping message and the received device information match; A twenty-fourth step if the ping response normally arrives, including the MAC address in the good MAC list; And a twenty-fifth step of transmitting a message using the MAC address obtained after the twenty-fourth step. The method of claim 5, wherein the twenty-second step is Returning to the eleventh step if the MAC exists in the bad MAC list after the twenty-first step; Returning to step 25 if the MAC exists in the good MAC list after step 21; And if the MAC is not present in the MAC list after the twenty-first step, returning to the twenty-third step.

Images