at t dns codes

In the previous blog post we introduced several indispensable records in DNS servers, including a, NS, and SOA records. In this blog post we will continue to introduce several other common DNS records, I hope you can understand the DNS helpful.Four MX recordMX records are also known as Mail Exchanger Records, and MX records are used to indicate which server is

Pre-Erection Preparation:To set up a DNS server, you must install a software program that provides a DNS service, the BIND software, that can be installed using the following command:Yum install-y bind-chroot Bind-utis 1. Modify the master configuration file/etc/named.confThis server is relatively simple to set up, that is, in fact, this [so-called DNS ser

DNS domain Name service and build cache DNS server detailed (2)1.DNS Service Installation: BIND, full name is Berkeley Internet name Domain, this software is maintained by ISC/etc/named.conf: The main function is to define the working properties and areas of the bind process/etc/rndc.key: Full name Remote name Domain Controller, primary storage key file/etc/rndc.

"Experimental description"Experimental environment: Add a server ns2.test.com, IP 192.168.0.112;Experimental purpose: The new server is configured to 192.168.0.111 this primary DNS server from the DNS server;" conditions for implementing master-Slave Synchronization"1, the master-slave server time must be synchronized, using NTP and time server periodic synchronization time;[Email protected] ~]# vim/etc/cro

Recently, my colleague reported that during the NSLookup test on the Intranet, I found that when I used the Intranet DNS server 192.168.1.1 for resolution, the DNS server responded very quickly and did not Any errors. However, when the DMZ server 51.144.198.99 is used for testing, the system always prompts that the request times out and returns the correct resolution. We suspect that the firewall we are usi

Secondary DNS server configuration******************The purpose of the secondary server: First, as a backup of the primary DNS server, the second is to share the load of the primary DNS server.The configuration of a secondary DNS server is relatively straightforward, because its zone database files are periodically cop

Have you ever encountered a DNS error or can be on the QQ but not open the Web page situation? Or is it too slow to open the page? These could be DNS setup errors or no settings, so here's how to troubleshoot DNS errors and how to set up DNS to navigate the web smoothly. Tools/raw Materials Windows Xp/vista Treewalk

Today when looking at the source code of a website found rel= "dns-prefetch" href= "//static.tuweia.cn/" > A little curious about dns-prefetch, Because more than once to see, today finally can't help to see what he is what technology? Here is a brief description of Dns-prefetch found on the internet.DNS implements domain-to-IP mapping. Through the domain name to

Before you build a DNS server, introduce the terminology in several DNS 1, forward lookup zone: mapping for Computer name to IP address. When a DNS client initiates a request to a DNS server to resolve the IP address of a computer name, the DNS server looks in the forward l

In the previous blog, we introduced the architecture of DNS, the common records, also introduced the configuration of the secondary server, today we will introduce some of the files behind the DNS server. In fact, the work of the DNS server relies on these files, understand the background files of DNS, to better unders

DNS is the basic service of the internet, and bind is the most popular open-source DNS software. Because it is very popular, it is very aggressive. Therefore, we need to build a secure DNS server. There are several measures to build a secure DNS Service (for basic bind compilation and installation and configuration, re

DNS Subdomain authorizationRole: Applies to the same DNS organizationThe resolution of the parent/child domain is handled by a different DNS serverThe parent DNS server should have the ability to iterate over the sub-domain nameSubordinate areabelong to different agency management:. CN and. anonymous.cn. CN needs to kn

Most DNS cache servers exist in small enterprises. they are not responsible for domain name resolution and are only used to help users query domain name information from other DNS servers. The queried information is saved locally to facilitate the next use of the domain name. it is valid to shorten the domain name query time and save the local information. The following is... information Most

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 servers, only by the two types of domain name

Originally in this verse to explain the installation of DNS, but I found that in fact before this, but also need to explain a few basic concepts, first of all, the DNS suffix. In the previous basic chapters, we know that a domain name can be divided into the main and suffix 2 parts, where the host we can understand as a host or a network terminal name, the suffix directly determines the nature of the domai

Passive Information collectionFeatures:Based on open channelNo direct contact with the targetAvoid leaving all traces.Standard Reference--osint:U.S. militaryNorth Atlantic Treaty Organization noun explanationdns--domain Name System domain Name SystemsA distributed database that maps the domain name and IP address on the Internet makes it easier for users to access the Internet without remembering the number of IP strings that can be read directly by the machine. The process of obtaining the IP a

Recently found that a number of installation Win8.1 system users encountered Win8.1 application store and Updata Automatic Updates, the presence of the application store can not open and can not get automatic update information and so on. And these two kinds of problems, we can usually modify the DNS server address to be resolved, so the following article will be a detailed introduction to the next Win8.1 how to set up

Website optimization technology is always evolving. Today I re-read the previous front-end optimization notes and found that the section on YSlow Optimization 34 guidelines on reducing DNS lookups (reduce DNS lookups) should probably be revised. DNS as the foundation of the Internet Protocol, the speed of its resolution seems easy to be overlooked by site optimiz

Most of the network traffic is based on TCP/IP, while TCP/IP traffic is based on IP address, but in the real network access who is willing to use IP address, because the IP address we remember inconvenient. To solve this problem, DNS is available. DNS: Domain Name System users access to the Internet through the input www.luwenju.com actually entered a computer name, the user's computer to the

Originally transferred from http://hi.baidu.com/shyoung/blog/item/b0ccff03fd462481d43f7c5a.html The complete DNS System of the DNS component consists of the DNS server, region, Parser (DNS client), and resource records, and you need to correctly configure them. The DNS proto