KR20010107137A - A domain name service system with clients using domain caches - Google Patents

Abstract

The present invention is to provide a domain information service method using a domain cache in an Internet domain name search system. The present invention stores the used IP address or domain name in the domain cache, and requests this domain cache when a domain name search request is made. By primarily retrieving, reducing the number of retrieval requests to domain name servers for repetitive domain search requests, which reduces the load on domain search servers and allows client computers to obtain relevant information more quickly, improving performance. Be sure to

Description

A domain name service system with clients using domain caches}

The present invention relates to the mapping of Internet domain names and IP addresses. In particular, an IP address or domain name that has been used is stored in a domain cache. By reducing the number of search requests to the domain name server in the case of repetitive domain search requests, it reduces the load on the domain search server calculation and improves performance by allowing client systems to obtain relevant information more quickly. It relates to a domain information service method using a domain cache.

The name you give to an Internet site is called the Internet domain name. Objects on the Internet can be communicated by assigning an IP address consisting of only numbers.

From a computer's point of view, an IP address alone can be an excellent name for an object, but since it is not practical for people to use IP that consists only of numbers on a daily basis, they use a method of linking a numeric name to a letter. Thus, there is a need for a service that provides match information between numeric and character names, and the computer providing such a service is called a domain name server. Recently, domain name servers map other types of domain addresses in addition to IP information.

A client computer refers to a computer that requests a domain name server for a mapping relationship of domain names. The client computer has a domain name service client program (hereinafter abbreviated as client program) that requests a name server for matching information of domain names.

This client program works when an application attempts to access another site using a character name to request information from a domain name server. This program may be part of an application program or may be a standalone program. That is, currently, most application programs directly access a domain name server and request a name search. Here, a program that performs the function is called a client program. In recent years, the centralized name service, which requires access to a dedicated server, has been developed and distributed in a separate form.

The distributed name service is distributed locally with name servers, and each client computer is associated with one or more name servers to receive a search service. Name servers work in conjunction with other name servers to exchange domain information.

Centralized naming services are a type of service that has begun to emerge recently, in which all client computers connect to a single name server to obtain information.

A client computer, a normal user's computer, requests a domain search from its domain name server whenever it visits another Internet site. Even when the user repeatedly visits the same site, the same domain information is repeatedly requested from the domain name server. Therefore, there is a problem that the processing speed is lowered by increasing the load on the domain search server, and there is a disadvantage that the request information is not provided quickly from the client computer.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object of the present invention is

By storing the IP address or domain name that was used in the domain cache, the domain cache is searched first when the domain name search request is made, and the number of search requests to the domain name server in the case of repeated domain search requests is reduced. The purpose of the present invention is to provide a domain information service method using a domain cache that reduces the computational load of the server and improves performance by allowing client computers to obtain relevant information more quickly.

In order to achieve the above object, the domain information service method using the domain cache according to the present invention,

The client system first searches for an internal domain cache when an IP address or domain name search is requested, and provides the information to an application program if the requested information is stored;

A first search step of requesting a search by accessing a domain name server if the requested information is not stored as a result of the domain cache search, receiving the domain information in the domain cache, and transmitting the received domain information to a domain application;

The client system examines the domain information received in the domain cache search step or the domain information provided in the first search step, and if the domain information is an IP address, attempts to access the corresponding site. Performing a IP address search request to the name server, and receiving a search result information and attempting to access the corresponding site;

As a result of the attempt to access the corresponding site, if the connection to the corresponding site is not successful, the method may include performing a domain cache update step of deleting the corresponding information of the domain cache.

1 is a block diagram of a client system and a domain name server block to which the present invention is applied;

2A is a diagram illustrating a case where an application program executed on a client system includes a client program;

2b is a diagram showing a case in which a client program is operated independently of an application program on a client system;

3 is a diagram illustrating a domain information service method using a domain cache according to the present invention;

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

10: Client System 11: Domain Cache

20,30,31: Domain Name Server

Hereinafter, a domain information service method using a domain cache according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a client system and a domain name server block to which the present invention is applied. The client system 10 requests a domain name search and attempts to connect to the site with the IP address thus obtained. Domain name server 20, 30, 31 performs a function of mapping the requested domain name and IP address, the domain name server 20 is a centrally operated system, domain name server 30 ( 31) are distributed systems.

In addition, the client system 10 includes a domain cache 11 that temporarily stores a domain name or an IP address that has been used by a user.

In addition, the client system 10 performs software for accessing a corresponding site on the Internet, which includes an application program and a client program.

As shown in FIG. 2A, the client program may be included as part of this application program, and as shown in FIG. 2B, the client program may be independent of the application program.

3 is a flowchart illustrating a domain information service method using a domain cache according to the present invention.

As shown, the client system preferentially searches the internal domain cache when an IP address or domain name search is required, and provides a domain cache search step (ST11, ST12) that provides the information to the application if the requested information is stored. , ST13); As a result of the domain cache search, if the requested information is not stored, a request is made by accessing a domain name server, and receiving the domain information as a response, storing the information in a domain cache, and transmitting the information to an application program (ST14). Wow; The client system examines the domain information received in the domain cache search step (ST11-ST13) or the domain information provided in the first search step (ST14), and attempts to access the corresponding site if the domain information is an IP address. A second search step (ST15-ST17) of performing an IP address search request to the domain name server for a set number of times if not an IP address, and then receiving search result information and attempting to access the corresponding site; As a result of the attempt to access the corresponding site, if the connection to the corresponding site is not successful, the domain cache updating step (ST17-ST20) of deleting the corresponding information of the domain cache is performed.

The domain cache updating step further includes simply deleting the failed domain, and the client system transmits a list of information stored in the domain cache to a domain name server connected in the first search step, and transmits the list. The received domain name server checks whether the mapping between the domain name and the IP address is changed, if there is changed information as a result of the check, transmitting the changed information to the client system, and transmits the changed information from the domain name server. Upon receipt, the client system may further perform the step of modifying the storage information of the domain cache.

The domain information service method using the domain cache according to the present invention as described above will be described with reference to embodiments.

First, when the application program and the client program in the client system 10 is operated independently of each other, the domain information service method using the domain cache according to an embodiment of the present invention, when a character name or domain name is input from the user, the application program Requesting the client program to search for a domain name for the input character name or an IP address for the input domain name; The client program receiving the request comprises: a second step of searching a domain cache to find a domain name or an IP address; After performing the second step, the client program transmits the corresponding domain information to the application program if the desired information is stored in the domain cache. If the desired information is not stored in the domain cache, the client program accesses a domain name server. A third step of requesting retrieval of domain information; After the third step, if the domain information is transmitted from the domain name server, the client program stores the received domain information in the domain cache and transmits the received domain information to the application program; The application checks whether the domain information received in the third step or the fourth step is an IP address, and if the result is not an IP address, requests the IP address search to the domain name server for a predetermined number of times, and transmits the result. Perform the fifth step.

As described above, when an application and a client program are operated independently of each other in the client system 10, one embodiment of the case where the first request is requested from the client program and the second request is requested from the application program will be described below. Same as

Here, the first search request is an act of requesting a search for a domain name server when the domain cache is not found in the domain cache, and the second search request is a set number of times when the domain information received as a search result is not an IP address. As much as it refers to the act of requesting a search from a domain name server.

When a character name or domain name is input from the user, the application program requests the client program to search for the domain name for the input character name or the IP address for the input domain name (step 1). The client program then searches the domain cache to find the domain name or IP address (step 2).

Here, the domain cache will be described. As shown in [Table 1], mapping information of domain names already searched is stored.

Domain name Mapping Information (IP Address or String) Frequency of use When to use JumByul.com 211.47.54.134 1234 5.24.17: 00 SB www.sbs.co.kr 123 5.24.17: 30

When the domain name JumByul.com is input from the user, the application sends the JumByul.com information to the client program and requests the domain information retrieval.

The client program searches the domain cache to find the IP address 211.47.54.134, which is mapped to JumByul.com, and sends it to the application.

On the other hand, if a search is requested by inputting domain information of "SBS" from the user, the application program sends the information "SBS" to the client program and requests the search. The client program first searches the domain cache, finds the domain information www.sbs.co.kr that is mapped to SBS, and sends it to the application program.

On the other hand, when a user is requested to search for information on a domain name that is not in the cache table of the domain cache, the client program connects to the domain name server and requests domain information search (primary search request) (step 3). Thus, when domain information is transmitted from the domain name server receiving the request, the client program stores the information in the domain cache and transmits the information to the application program (step 4).

When the application receives the domain information found in the domain cache or receives the domain information from the domain name server side through the client program, the application checks whether the received information is an IP address.

Therefore, if the IP address is information that can be recognized by the application, try to access the site. However, if it is a domain name rather than an IP address, it will ask the domain name server for an IP address lookup (secondary search request).

That is, in response to a request for retrieving domain information for SBS, when the client program finds the domain cache and transmits "www.sbs.co.kr" to the application, the application returns the IP address of the domain information retrieval result. Because it is not a server, it connects to a domain name server and requests IP address retrieval.

So when an application receives domain information from a domain name server, it checks whether the information is an IP address. If it is not an IP address, a search request is made to the domain name server again. This search request is performed as many as the set number of times, and if the IP address is received as the search result information within the set number of times, an attempt to access the corresponding site is performed (step 5). In addition, when receiving domain information other than an IP address, if a second search request is performed for a set number of times, the search request is not made any more. Therefore, it tries to access the site by using the information received from the domain name server.

In this case, the domain name server connected in the first search request and the domain name server connected in the second search request may be the same or different.

In this case, the size of the domain cache may be limited. If the domain name is larger than the size, some domains should be deleted in order of priority. Information that can be used to determine the priority includes the frequency of use and the point of use. The higher the frequency of use and the more recent time of use, the higher the priority.

Next, when the application program and the client program in the client system 10 is operated independently of each other, the domain information service using the domain cache according to an embodiment of the case where the client program performs both the primary search and the secondary search request The method may further include a first step of requesting the client program to search for a domain name for the input character name or an IP address for the input domain name when a character name or a domain name is input from a user. Wow; The client program receiving the request comprises: a second step of searching a domain cache to find a domain name or an IP address; After performing the second step, if the desired information is not stored in the domain cache, the client program connects to a domain name server and requests domain information retrieval; If the desired information is stored in the domain cache, the client program checks whether the information is an IP address or not, and checks whether the search result information received from the domain name server is an IP address. Otherwise, a fourth step of performing an IP address search request to the domain name server for a set number of times; After performing the fourth step, if the domain information is transmitted from the domain name server, the fifth step of transmitting to the application program is performed.

Referring to the operation of the embodiment when both the first search and the second search request in the client program as described above are as follows.

When a character name or domain name is input from the user, the application program requests the client program to search for the domain name for the entered character name or the IP address for the entered domain name (step 1).

Upon receiving this request, the client program searches the domain cache to find the domain name or IP address (step 2). Thus, if the desired information is not stored in the domain cache, the client program connects to the domain name server and requests domain information search (primary search request) (step 3).

Therefore, if the desired information is stored in the domain cache, the information is checked to see if it is an IP address, and if it is not an IP address, the IP address search is requested again to the domain name server (secondary search request). Alternatively, if the desired information is stored in the domain cache by performing the second step, it is checked whether the information is an IP address. So, if it is not an IP address, it requests the IP address search again from the domain name server (second search request) (step 4).

The secondary search request is performed as many times as the set number of times, and before the search request to the domain name server is performed for the set number of times, if the IP address is searched and transmitted from the domain name server, the secondary search request is stopped. In addition, if a search request to the domain name server is performed as many times as the set number of times, the search request is no longer performed regardless of whether an IP address is received. In this way, when the search result information is transmitted from the domain name server as a result of performing the secondary search request, the client program transmits this information to the application program (step 5).

In addition, when the application program is operated including the client program, the application program performs the first search and the second search request, the description thereof will be omitted.

In this way, the client system stores the domain information that has already been used in the internal domain cache, and if the domain name information is to be searched, the domain cache is first searched to obtain the corresponding information.

However, when the mapping between the domain name and the IP address is changed, such as when the owner of the domain name connects to the domain name server and deletes the domain name, the domain cache should also store the changed mapping information.

To this end, when the client system receives an IP address as a search result and attempts to connect to the IP address, if the connection fails, the client system deletes the corresponding mapping information of the domain cache (ST19, ST20). Thus, the information in the domain cache is updated.

Or, when connected to a domain name server, the client system sends a list of information stored in the domain cache to the connected domain name server. The domain name server receiving the list checks whether the mapping between the domain name and the IP address has changed, and if there is any changed information, sends the changed information to the client system. The client system may then update by updating the cache cache information. The overall update of the domain cache is performed at a time arbitrarily designated by the client program, for example, when a domain search fails, or may be performed when the application program is terminated.

As described above, in the domain information service method using the domain cache of the present invention, the used IP address or domain name is stored in the domain cache, and when the domain name search request is made, the domain cache is first searched, thereby repeating the domain. In the case of the search request, the number of search requests to the domain name server is reduced, thereby reducing the computational load of the domain search server and improving the performance by allowing the client computer to obtain relevant information more quickly.

Claims (4)

In a method for retrieving an Internet domain name, comprising a client system and a domain name server, The client system first searches for an internal domain cache when an IP address or domain name search is requested, and provides the information to an application program if the requested information is stored; A first search step of requesting a search by accessing a domain name server if the requested information is not stored as a result of the domain cache search, receiving the domain information in the domain cache, and transmitting the received domain information to a domain application; The client system examines the domain information received in the domain cache search step or the domain information provided in the first search step, and if the domain information is an IP address, attempts to access the corresponding site. Performing a IP address search request to the name server, and receiving a search result information and attempting to access the corresponding site; And a domain cache updating step of deleting the corresponding information of the domain cache if the connection to the corresponding site is not successful as a result of the attempt to access the corresponding site. The method of claim 1, wherein the domain cache update step, The client system transmits a list of information stored in the domain cache to a domain name server connected in the first search step, and the domain name server receiving the list changes whether a mapping between a domain name and an IP address is changed. Checking the; and, if there is changed information as a result of the checking, transmitting the changed information to the client system; and receiving the changed information from the domain name server, the client system correcting the stored information of the domain cache. Domain information service method using a domain cache, characterized in that further comprising. In the domain information service method when an application and a client program operate independently of each other in a client system, If a character name or domain name is input from a user, the application program requesting the client program to search for a domain name for the input character name or an IP address for the input domain name; The client program receiving the request comprises: a second step of searching a domain cache to find a domain name or an IP address; After performing the second step, the client program transmits the corresponding domain information to the application program if the desired information is stored in the domain cache. If the desired information is not stored in the domain cache, the client program accesses a domain name server. A third step of requesting retrieval of domain information; After the third step, if the domain information is transmitted from the domain name server, the client program stores the received domain information in the domain cache and transmits the received domain information to the application program; The application program checks whether the domain information received in the third step or the fourth step is an IP address, and if the result is not an IP address, performs an IP address search request to the domain name server as many times as the set number, and the result is obtained. The domain information service method using a domain cache, characterized in that the fifth step of receiving. In the domain information service method when an application and a client program operate independently of each other in a client system, If a character name or domain name is input from a user, the application program requesting the client program to search for a domain name for the input character name or an IP address for the input domain name; The client program receiving the request comprises: a second step of searching a domain cache to find a domain name or an IP address; After performing the second step, if the desired information is not stored in the domain cache, the client program connects to a domain name server and requests domain information retrieval; If the desired information is stored in the domain cache, the client program checks whether the information is an IP address or not, and checks whether the search result information received from the domain name server is an IP address. Otherwise, a fourth step of performing an IP address search request to the domain name server for a set number of times; And after the fourth step, if domain information is transmitted from a domain name server, performing a fifth step of transmitting to the application program.