Domain name system DNS secondary recursion resolution method

Abstract

The invention discloses a domain name system DNS secondary recursion resolution method. After a local DNS server receives a domain name resolution request of a user host, whether a resolution result is cached locally or not is firstly checked, if the resolution result is cached locally, a process is directly responded and finished, if the resolution result is not cached locally, the local DNS server carries out recursion resolution, and the user host is prevented from being attacked by address pollution and domain name hijacking; only when the recursion resolution is failed, the domain name resolution request is forwarded to an external recursion resolution server for secondary resolution; and the local DNS server receives a resolution result returned by the external recursion resolution server, sends the resolution result to the user host and records a cache. The cache record is stored in the external recursion resolution server and positions of network nodes are different, so the condition that the user host cannot access a domain name due to a recursion failure resulting from an error occurring in authorized DNS configuration of a searched domain name is not liable to occur. The method provided by the invention is simple and convenient in operation steps, no hardware is increased, only functions of the local DNS server is modified, and the recursion resolution is backed up.

Description

technical field [0001] The invention relates to a method for secondary recursive resolution of Domain Name System DNS (Domain Name System), belonging to the technical field of computer network communication. Background technique [0002] Domain Name (Domain Name) is the name of a certain computer or computer group on the Internet, which is used to identify the computer's electronic location (sometimes geographical location) during data transmission. A domain name consists of a string of dot-separated characters as its name, usually containing the name of an organization, and always includes a two- or three-letter suffix to indicate the type of organization or domain The country or region in which you are located. [0003] Domain Name System DNS (Domain Name System) is a distributed database that maps domain names and IP addresses (IP addresses) on the Internet. It stores a table of domain names and corresponding IP addresses for resolving domain names in messages. , so tha...

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Problems solved by technology

However, the above-mentioned recursive-only method only performs recursion, so when there is a problem with the authoritative DNS configuration of the queried domain name or improper security protection policy configuration, the local DNS server cannot obtain the resolution result through recursive resolution, which will cause Even if the host where the domain name is located works normally, but because the domain name cannot be resolved, the user still cannot normally access the host or resource of the domain name

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