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Domain name server (DNS) cache camping-based domain name resolution method and system

A domain name resolution system and technology for domain name resolution, applied in domain name resolution methods and systems based on DNS cache residency, capable of solving the problem of authoritative server and recursive server failure deterioration, domain name resolution that cannot be resolved normally, authoritative server and recursive server domain name resolution performance Influence and other issues, to achieve good technical effects, improve the effect of speed

Active Publication Date: 2017-01-11
BEIJING RUNSTONE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] With this traditional caching strategy, when the resolution of the authoritative server or the upper-level recursive server is abnormal, the original record has been deleted when the TTL of the domain name expires, and the request of the domain name to the authoritative domain name server or the recursive server cannot obtain normal resolution results. , then the resolution of the domain name cannot be resolved normally, and it will be reflected on the user side, causing the user to be unable to access the Internet normally.
In this case, a large number of recursive requests for this domain name will definitely affect the domain name resolution performance of the authoritative server and recursive server, and even lead to further deterioration of the failure of the authoritative server and recursive server

Method used

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  • Domain name server (DNS) cache camping-based domain name resolution method and system
  • Domain name server (DNS) cache camping-based domain name resolution method and system
  • Domain name server (DNS) cache camping-based domain name resolution method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1 As shown, a domain name resolution method based on DNS cache residency, including:

[0047] Receive a resolution request for a domain name initiated by a user;

[0048] Query whether the resolution result of the domain name is cached in the cache server and whether the TTL has expired;

[0049] If the resolution result of the domain name has been cached in the cache of the current cache server, and the TTL has not expired, the cache server returns a response directly to the user.

[0050]After the present invention adopts the above scheme, the DNS cache based on the cache server not only improves the resolution speed, but also when the authoritative server or recursive server resolves abnormally, the cache server can keep the cache and wait for the authoritative server or recursive server to resolve normally. The record of the domain name is updated from time to time, which has a good technical effect.

Embodiment 2

[0052] The present invention will be further described in conjunction with the following embodiments. Specifically, it is preferred that there is no resolution result of the domain name in the cache of the current cache server;

[0053] The cache server transparently transmits the request and sends it to the recursive server or authoritative server;

[0054] The recursive server or authoritative server resolves the domain name and returns a response, and the cache server parses the domain name records in the response and saves them in the cache, and returns the response to the user at the same time.

[0055] Preferably, if the resolution result of the domain name has been cached in the cache of the current cache server, however, the TTL has expired;

[0056] The cache server returns a response to the user first;

[0057] A request is sent to the recursive server or authoritative server, and the recursive server or authoritative server returns a response by normally resolving ...

Embodiment 3

[0061] combine Figure 2-5 The present invention is described in detail, specifically, as figure 1 As shown, it is the first query process. The user initiates a resolution request for a domain name. The current cache server does not have the resolution result of the domain name in the cache. The cache server transparently transmits the request and sends it to the recursive server or authoritative server. The recursive server Or the authoritative server can normally resolve the domain name and return a response. The cache server parses the domain name record in the response and saves it in the cache, and returns the response to the user at the same time, such as figure 1 shown.

[0062] Such as figure 2 As shown in the query process again, in which the user initiates a resolution request for a domain name, the resolution result of the domain name has been cached in the cache of the current cache server, and the TTL has not expired, the cache server directly returns a respons...

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Abstract

The present invention discloses a domain name server (DNS) cache camping-based domain name resolution method and system. The method comprises the steps of receiving a user-initiated request to resolve a domain name; inquiring whether a resolution result of the domain name is cached in a cache server and whether an TTL is expired; and if the resolution result of the domain name is cached in the cache server and the TTL is not expired, directly returning, by the cache server, a response to the user. According to the method, DNS cache based on the cache server improves the resolution speed; further, when an authoritative server or a recursive server resolves abnormally, the cache server makes the cache resided and waits to update a domain name record until the authoritative server or the recursive server resolves normally, so that the technical effect is better.

Description

technical field [0001] The invention belongs to the technical fields of network technology and domain name system (DNS), and in particular relates to a domain name resolution method and system based on DNS cache residency. Background technique [0002] DNS is the domain name system, a core service of the Internet, responsible for the resolution of mapping records between domain names and IP addresses, and is also a distributed database. The main function of the DNS cache server is to temporarily store the response information records from the authoritative server or recursive server in its cache. It can directly respond to the corresponding record information to the user, thereby effectively improving the efficiency of domain name resolution and reducing unnecessary bandwidth consumption. The efficient operation of DNS cache is a key factor to ensure the recursive domain name service and even the whole domain name service level. [0003] The authoritative domain name servi...

Claims

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Application Information

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IPC IPC(8): H04L29/12H04L29/08
CPCH04L61/4511H04L67/5682H04L67/568
Inventor 丁文涛孙萍
Owner BEIJING RUNSTONE TECH
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