Caching detecting method, caching detecting device and detection responding device for domain name system

A domain name system and detection device technology, applied in the network field, can solve problems such as connection failure, and achieve the effect of avoiding the failure to update in time

Active Publication Date: 2008-09-24
NEW H3C TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

It can be seen that in the prior art, when the DNS cache is not updated in time, there will be a connection failure

Method used

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  • Caching detecting method, caching detecting device and detection responding device for domain name system
  • Caching detecting method, caching detecting device and detection responding device for domain name system
  • Caching detecting method, caching detecting device and detection responding device for domain name system

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Embodiment Construction

[0043] In the embodiment of the present invention, in order to avoid the connection failure caused by the inability of the DNS cache to be updated in time, after finding the record of the corresponding host domain name and IP address from the cache, the IP address in the record is not directly used to initiate the connection. Instead, send a probe for the host domain name to the host corresponding to the IP address first, and judge whether the other party is the host corresponding to the host domain name according to the probe result, and when the judgment is yes, use the IP address in the record to initiate a connection.

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0045] figure 1 It is an exemplary flow chart of a method for detecting a DNS cache in an embodiment of the present invention...

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Abstract

The invention discloses a cache detection method of a domain name system (DNS), a cache detection device and a detection response device thereof, wherein, the method comprises the steps of searching for the corresponding record of the domain name and the IP address of a host in local cache according to the query request including the domain name of the host, transmitting a detection aiming at the domain name of the host to the host corresponding to the IP address in the record, judging whether the host is the corresponding host of the host domain name or not according to the detection result, and if the answer is yes, the IP address is set as the corresponding IP address to the host domain name, while if the answer is no, the corresponding IP address is inquired to a DNS server. The technical proposal disclosed by the invention can avoid failure connections caused by being unable to renew DNS cache in time.

Description

technical field [0001] The invention relates to network technology, in particular to a domain name system (DNS, Domain Name System) cache detection method, a cache detection device and a detection response device. Background technique [0002] In the current IP network, the IP address is the unique identifier of the host in the network, and the communication between computers can only use the IP address like "xxx.xx.xx.xxx" to identify the host, where x represents a number. However, as computer users, people are more accustomed to using computer domain names to access other computers, such as using the domain name "www.abcd.com" to access the corresponding computers. [0003] In this way, a conversion mechanism is needed to realize the conversion between computer domain names and IP addresses. Based on these requirements, DNS came into being. DNS is a naming system for computers and network services organized into domain hierarchies, mainly used to pass user-friendly and fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/12
Inventor 甘长华
Owner NEW H3C TECH CO LTD
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