recursive dns

The previous section mentioned some of the content of the recursive query, but said very little, but also very general, this section will be based on the principle and the case two aspects of DNS recursion and iterative query. Before that, we need to learn some background to better understand today's topic. In the Internet, a smooth resolution of a domain name is inseparable from two types of domain name

In the last section, we use the form of text to describe the process of DNS parsing, in order to better help you understand the entire parsing process, I did a DNS domain name resolution of the step-by-step diagram, as follows: In this diagram, the 8-step parsing process allows the client to successfully access the domain name of www.163.com, but in practical applications, the process is usually very rapid

DNS recursive query and iterative query Summary There has always been confusion about the "recursion" and "iteration" approaches to DNS queries. Most people just tell you. "DNS clients request recursive queries to DNS servers,"

Build a master-slave DNS server and explain important transfer and recursive attributes 1. The main function of allow-recursion is to allow recursive queries on hosts to prevent DNS servers from hanging up or wasting network resources. For example, only recursive

Tags: DNS recursive query and iterative Query 650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M00/4D/52/wKiom1RPZRSxYYKoAAcGjN5cp0M611.jpg "Title =" dnsquery.jpg "alt =" wkiom1rpzrsxyykoaacgjn5cp0m611.jpg "/> Differences between iterative query and recursive query 1. recursive query: {one query} It is

After studying for a while, I was confused for a while, and finally understood. The simplest way to understand it is as follows: Recursion: The method between the client and DNS. The client entrusts its DNS to query the ip address. Iteration: The method between DNS servers. After the client uses recursion to communicate with

iterative queries and recursive queries are two types of requests that can be sent to a domain name server. Recursive queries are the most common requests sent to a local domain name server. When the local domain name server accepts the client's query request, the local domain name server will try to find the answer on behalf of the client, while the client is just waiting when the domain name server perfor

Http://zhangbin.blog.51cto.com/666869/286257 1. recursive query:Generally, recursive queries are performed between the client and the server. After a request is sent from the client to the DNS server, if the DNS server itself cannot be resolved, a query request is sent to another

based on different configurations:By default, the DNS server uses recursion to resolve the name. The recursive method means that the DNS server queries the resolution request from other DNS servers as the DNS client until the resolution result is obtained. During this proce

names, so hosts files could be said to be relatively simple databases. However, as the network exploded, A hosts file, a server, and a group of DNS clusters cannot hold more and more host requests. Therefore, a distributed database has emerged, which is used to cut a database into n slices, resolve client requests on different hosts. When different hosts need to be resolved, they are implemented on different servers to relieve the huge pressure on th

Source: http://www.itechzero.com/dns-hijacking-dns-pollution-introduction-and-public-dns-recommend.htmlWe know that some network operators for some purposes, some of the DNS operation, resulting in the use of the ISP's normal Internet settings cannot obtain the correct IP address through the domain name. Common means a

related to www.qq.com during the query. 223.5.5.5 keeps a backup in its own cache, so there are two types of answers: authoritative response and non-authoritative response. If 223.5.5.5 directly reads the returned results from its own cache, it is an unauthoritative response. If the result is obtained from the authoritative name server of the domain name itself, it is the authoritative response. It is the flowchart of the DNS query Process in "

DDoS attack The normal DNS server recursive query process may be exploited as a DDoS attack. Suppose an attacker knew the IP address of the attacked machine, and then the attacker used the address as the source address to send the resolution command. This allows the DNS server to respond to the original user when a recursiv