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Method for acquiring IP (Internet Protocol) used by recursive DNS (Domain Name System)
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A recursive, client-side technology, applied in the direction of electrical components, transmission systems, etc., can solve problems such as the inability to directly obtain IP and the difficulty of problem analysis, and achieve the effects of high applicability, reduced difficulty, and reduced costs
Active Publication Date: 2016-10-12
成都知道创宇信息技术有限公司
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[0003] The early DNS was only responsible for resolving available IP records for users, and did not judge the source of users; with the development of the Internet, especially the popularity of CDN, those who can be based on the user's source information (such as geographical location, operator, etc.) ) The authoritative DNS that provides more suitable resolution results came into being; its working mechanism is based on a premise, that is, the recursive DNS and the user client, and the IPs of the two need to have the same information (such as the same geographical location and operator); However, this condition is not satisfied for all users, so it is necessary to obtain the IP of the last level of recursive DNS and the IP of the user itself, and compare and analyze the two; but the IP of the last level of recursive DNS cannot be obtained directly, which is a problem It is difficult to analyze
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Embodiment 1
[0035] Set a fixed domain name, such as myrd.jiashule.com; the client sends an A record query to the authoritative DNS through the recursive DNS;
[0036] When the authoritative DNS receives the A record query of the domain name, it returns the requester's IP as the domain name resolution result to the client, and the TTL time is set to 30s;
[0037] After the client receives the analysis result, it processes the analysis result through the Ping program, and obtains the required IP used by the last level of recursive DNS.
Embodiment 2
[0039] Set a fixed domain name prefix, assuming that both example-a.com and example-b.com use the same authoritative DNS for resolution, the authoritative DNS can set a unified prefix myrd, converted to: myrd.example-a.com and myrd.example-b.com; client sends A record query to authoritative DNS via recursive DNS;
[0040] When the authoritative DNS receives the A record query of the relevant domain name, it returns the IP of the requester as the domain name resolution result to the client, and the TTL time is set to 30s;
[0041] After the client receives the analysis result, it processes the analysis result through the Ping program, and obtains the required IP used by the last level of recursive DNS.
Embodiment 3
[0043] Set a fixed domain name, such as myrd.jiashule.com; the client sends an A record query to the authoritative DNS through the recursive DNS;
[0044] When the authoritative DNS receives the A record query of the domain name, it returns the requester's IP as the domain name resolution result to the client, and the TTL time is set to 30s;
[0045] When the analysis result is returned to the client, the returned IP is restored, and the position of the four numbers in the IP format is adjusted; the analysis result is processed through the Ping program to obtain the required IP used by the last level of recursive DNS.
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Abstract
The invention discloses a method for acquiring an IP (Internet Protocol) used by a recursive DNS (Domain NameSystem). The method comprises the following steps that: a fixed domain name is set, and a client transmits an A record query to an authoritative DNS through the recursive DNS; the authoritative DNS feeds back an IP of a requester to the client as a domain name resolving result when the A record query of the domain name is received; and the client processes the resolving result through a Ping program to obtain a needed IP used by a last-stage recursive DNS after the resolving result is received. Through adoption of the method, the IP of the last-stage recursive DNS can be acquired; the IP of the recursive DNS can be rapidly positioned; the manual analysis difficulty is lowered; the efficiency is increased; and the cost is reduced.
Description
technical field [0001] The invention relates to a method for obtaining IP in a burst, in particular to a method for obtaining IP used by recursive DNS. Background technique [0002] The DNS domain namesystem is the basic core service of the Internet. It maps and resolves domain names and IP addresses to support the normal operation of the Internet. According to functional roles, DNS can be divided into recursive DNS and authoritative DNS. When a user initiates a domainname resolution request, Recursive query will be performed level by level through recursive DNS first; if the query record is in the cache of recursive DNS, the resolution result will be returned to the user; if the TTL expires, recursive DNS will initiate a query request to authoritative DNS and update the resolution result . [0003] The early DNS was only responsible for resolving available IP records for users, and did not judge the source of users; with the development of the Internet, especially the po...
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