1. What is DNS?
(Domain Name System) domain name system.
In fact, the functions implemented by DNS are very simple and effective, so that users do not need to remember the IP addresses that frequently access the server, you can directly access the
The premise for the commercial use of IPv6 is that IPv4 addresses are exhausted. For this reason, we urgently need the IPv6 protocol to improve this situation. So how does IPv6 distribute DNS servers? Next we will analyze the principles in depth.
Set up DNS service on CentOS 7
Document Description:
This document uses a case study to deploy DNS services on CentOS 7. This case is only a summary of my knowledge about how to deploy the DNS service. It is not a case in the production environment.
ConceptDefault dns lookup sequence for linux clients:
Local DNS Cache → local hosts file → preferred DNS server (recursive)
Linux DNS Server Query sequence:The DNS cache of the preferred server → the domain in which the preferred server is
Each entry in a database is called a resource record (RR)
Resource record format:
The second field in the first section, the third field, the fourth field (resource record type), and the fifth field
Name TTL in (Internet) rrtvalue
If TTL is not
For DNS (domain Name System) Everyone is certainly not unfamiliar, is not used to convert a site's domain name to the corresponding IP. When we find that we can go to QQ but can't browse the webpage, we will think that the domain name server hangs
From theory to practice, all-round understanding of DNS2015-11-23 Programmer's Home
Selfboot
Original: http://segmentfault.com/a/1190000003956853
For DNS (Domain Name System) Everyone is certainly not unfamiliar, is not used to
A record, MX record, CNAME record, URL forwarding, NS record, dynamic record (RPM)
A record, MX record, CNAME record, URL forwarding, NS record, dynamic record (RPM) Table of Contents
Dns
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Aaaa
DNS server: Describes DNS service principles, installation, master-slave configuration, and dns master-slave configuration.
DNS server: Describes DNS service principles, installation, and master-slave configuration.
1. Introduction to DNS
1. DNS
DNS
DNS (domain Name System), a distributed database of domain names and IP addresses that are mapped to each other on the Internet, makes it easier for users to access the Internet without remembering the number of IP strings that can be read directly
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