DNS is currently one of the most indispensable servers on the Internet, and every day we surf the web with the help of DNS. The DNS server can resolve the domain name for us, locate the e-mail server, and locate the domain controller in the domain ... In the face of such an important server role, we need to do some in-depth research, this article tries to explore
divided into the following two schools:
The theory of using the forwarder function to improve efficiency: these friends believe that when many lower-layer DNS hosts use forwarder, the host is set to forwarder, because a lot of information records are recorded, for those lower-layer DNS hosts, it will increase much faster, that is, it will save a lot of query time! Basically, these basic processes
1. view the Host IP address resolved by the DNS host name
Host CommandPurposeResolve a host name to an Internet address or an Internet address to a host name.SyntaxHost [-n [-a] [-c Class] [-d] [-r] [-t Type] [-v] [-w] [-z] Hostname | Address [Server]Hostnew [-a] [-c Class] [-d] [-r] [-t Type] [-v] [-w] [-z] Hostname | Address [Server]DescriptionThe/usr/bin/host command returns the Internet Address of a host (when the Hostname parameter is specified)
# # # #三-Master DNS DNS Encryption # # # #1. Configuration of master-slave DNS1) Configure two DNS servers.2) where the DNS server is configured as follows:Vim/etc/named.rfc1912.zones---------------------------------------Zone "Westos.com" in {Slave type;Masters {172.25.254.100;};The file "Slaves/westos.com.zone";allow
Use bind, dlz, and MySQL to build intelligent DNS. The DNS data can be put into MySQL.
Yum list all | grep BIND contains an SDB package. You can also put our data in the database.
How can I enable the DNS log function? It is not recommended to enable the log function. If the log function is enabled, the DNS performan
Every time we enter any domain name in the browser to access a website, we use the Dns protocol to perform a "Domain Name: IP" query. As a command line user, the Nslookup command is the most widely used dns-related command. As a programmer, taking c # as an example, the ip address of a domain name is probably the same as the line "System. net. dns. getHostByName
Problem phenomenon:AD The domain controller operating system is WIN2008R2, and a rejected error occurs when a DNS host (A) or alias (CNAME) record is manually added in DNS Manager. However, after you join the client to the domain, you can see the DNS host (A) record for the corresponding client in DNS Manager. In the s
Server.
[Tips]
When setting options of named. conf, we can use the following useful options to enhance the security of the system:
Version "Hello World ";
When someone else wants to detect the version of our DNS server, the other party will get Hello World :)
Listen-on {192.168.100.254 ;};
If the DNS service runs on a server with multiple NICs, It lis
Today, the DNS system has already exceeded the originally set "Address Book" function. With the popularization of the Internet, more and more malicious intrusions and DDoS attacks have emerged. A modern DNS system should be designed to address these issues and provide end users with a fast and easy-to-use interface.The entry point for the DNS system is for the we
I don't know where you are. Anyway, I have a place called the ISP bandwidth service provider, Dr. Peng ... As the original credulous landlord said the legendary telecommunications plus the Great Wall Broadband dual service, the last to pull the landlord's net. As a result, I have never encountered my own IP address is telecommunications. Dr. Peng has always been the bar called the Great Wall broadband. I'm going to go oh ~ ~Always hijack my DNS, and,
Configure the DNS service in Liunx and the DNS service in Liunx
When you Ping the host name, you can map the IP address of the host, and vice versa. Configure and specify the DNS server to quickly deploy the cluster. You do not need to modify the HOSTS file on each host to resolve the IP address and host name. In Linux, DNS
First step, add the DNS configuration file
1. As shown in our Mac OS preferences, we found the "network" click into.
2. Now pop up the network window we can set up DNS, I here to cable as an example.
3. Then we click "Edit Position" to enter, as shown in the following figure.
4. In the pop-up dialog we click the "+" button, and then a new location of the network configuration file. I'll change it
(This article is synchronously published on javaeye.com. Repeat the source for reprinting)
In http://www.cnblogs.com/jackyrong/archive/2006/11/08/554694.html,
I briefly talked about how to deal with Party A's leadership. This is about how to deal with Party A's information project owner. This is also a very important part.How to deal with the relationship with Party
use sniffer to launch attacks?How about "Guess" ID?Why not? But the ID number is composed of two bytes, which means there are 65535 possible values! That is to say, if an attacker wants to launch a successful attack, he needs to construct 65535 forged replies with different IDCs. In this way, at least one package is available.For such attacks, we need a good bandwidth, and most importantly, we do not know when to send forged replies. He must first know that the other
Original article: http://yufuhai.laweach.com/Content_92951.html
WinFang'sAttorneyFeeWho should it be?BurdenAt present, there are two kinds of views. One is that the winning party bears the burden on its own, on the grounds that China does notDefeated partyPaid by the Claimant's attorneyLawsRules, but China has"PartiesParticipateLitigationYou can either hire a lawyer or not hire a lawyer. Moreover, Chinese laws also stipulate that citizens have the o
Experiment (I.)Experimental requirements: Configure DNS servers on two hosts, respectivelyExperimental Purpose:1. Do the authorization of the Bj.tarena.comDNS subdomain on the tarena.com.The 2.bj.tarena.com subdomain forwards the parent domain.Experimental environmentHost name FXHLJ IP address 192.168.1.20 responsible for parsing of the tarena.com domainWww.tarena.com 192.168.1.100Host name localhost IP address is 192.168.1.30 responsible for parsing
Install and configure the DNS server in linux, and configure the dns server in linux
1. DNS concept:
Simply put, DNS is a service on the system that uses port 53 to provide mutual conversion between domain names and IP addresses. For example, if you access www.csdn.net, the router cannot know the address. You need to
In the previous blog, we introduced the DNS server architecture, from which we learned that if we want to register a domain name, then we must go through the top-level domain name server or its subordinate domain name server for our application of the domain name to delegate, the right to resolve to our DNS server, In this way we can obtain the right to resolve the requested domain name. In this article we
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
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