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People may have such a puzzle: computers on the network can only identify such as "123.123.123.123" such as digital address, so why when we open the browser, in the Address bar to enter the domain name dns.qy.com.cn, we can see the page we need? In fact, just an IP address and domain name each other "translation" process. The former has to establish a domain name Mapping record that points to the corresponding IP address; for the latter, this record has been established and is in effect. The cr
Windows2000 domain name resolution is based on dynamic DNS, and the Implementation of Dynamic DNS is based on RFC 2136. In Windows 2000, Dynamic DNS is integrated with DHCP, WINS, and Active Directory (AD. There are three methods to implement DNS in Windows 2000 Domain: primary DNS
This article describes how to check whether the local DNS server works normally and how to update it. When we access a website, we directly enter the domain name in the browser, for example, www.webweb.com, when a website fails to be accessed normally, many users instinctively think that there is a problem with the local network or the target server. However, after some troubleshooting, however, it is not caused by these factors that the website canno
Most network communication is based on TCP/IP, while TCP/IP communication is based on IP addresses. But in real-world network access, who would like to use IP addresses for access? We cannot remember the IP addresses. To solve this problem, we have DNS. DNS: When a domain name system user accesses the Internet, the user enters www.luwenju.com as a computer name, and the user's computer delivers it to the
Reprint Please specify Source: http://blog.csdn.net/luotuo44/article/details/45545059DNS (domain Name System), readers have heard more or less that the domain name can be converted to an IP system. Makes it possible for us to access a website simply by remembering the domain name rather than the IP. When we enter a URL in the browser, the browser will send a query request to the local DNS server, the local DNS
Dns.c Copy Code code as follows: /* * DNS Query Program on Linux * * author:ismdeep@live.com * * */ Header Files #include #include #include #include #include #include #include List of DNS Servers registered on the systemChar dns_servers[10][100];int dns_server_count = 0;Types of DNS resource records:) #define T_A 1//ipv4 Address#define T_
The following content is reproduced from http://www.yuanma.org/data/2006/0721/article_1199.html How DNS works DNS is divided into client and server. The client plays the role of question, that is, to ask the server a domain name, and the server must answer the real IP address of this domain name. The local DNS first queries its own database. If your database does
Article Title: explores the running status of DNS servers. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. In Linux, it also provides a popular BIND server, which is the most commonly used server software for building DNS servers. There are many articles about BIND insta
In the previous article (man-in-the-middle attack ARP poisoning), we discussed dangerous hacker attacks and practical ARP poisoning principles. In this article, I will first discuss how to detect and prevent ARP poisoning (or ARP spoofing) attacks, and then I will review other man-in-the-middle attacks-DNS spoofing.ARP cache attacks are very dangerous. It is important to create security awareness and analyze effective tools and policies among users. I
In Linux, it provides a widely used BIND server, which is the most common server software for building DNS servers. There are many articles about BIND installation. Now let's talk about the maintenance topic. How can we understand the running status of the DNS server? Is it busy and load-intensive? All this is important for system administrators. To learn about the running status of the
The configuration file is located:/Etc/sysconfig/network-ScriptS/ifcfg-eth0Device = eth0Onboot = YesBootproto = staticIpaddr = 192.168.0.3Netmask = 255.255.255.0Gateway = 192.168.0.1 Make the IP address take effect:/Sbin/ifdown eth0/Sbin/IFUP eth0 Configure DNS resolutionEcho "nameserver 211.98.1.28">/etc/resolv. conf Notify gateway to update information:/Etc/init. d/network restart ① Introduction DNS is th
Several security questions about DNS Author: demonalex In the TCP/IP architecture, the most insecure is the data security at the application layer.Program/The remote buffer overflow and Script Injection of the operating system occur at this layer. Do you know how insecure it is ?! Today, I want to talk about the security of the DNS service, a protocol that is closely related to your daily network connec
Nbsp; (1) restrict name server recursive query function nbsp; disable recursive query to enable name server passive mode, when it sends a query request to the external DNS, it will only answer the query request of its authorized domain, without caching any external data, so it is impossible to suffer from cache poisoning (1) restrict name server recursive query Disabling recursive queries can enable the name server to enter the passive mode. when it
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 responsible → query information fro
Article title: detailed explanation of dns settings in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. DNS overview DNS is the Domain Name System, which can convert a Domain Name such as www.21php.com to an IP addres
DNS is a very important basic service. Many applications are based on DNS services, such as the most commonly used HTTP browser. Many of my friends said they could not access the internet in the Forum. In fact, they could not resolve the FQDN name, that is, there was a problem with accessing the DNS service. If they only used IP addresses for access, for example,
This article divides the DNS into two kinds, one is the host or the embedded device DNS, one is the website domain name DNS, to tell the DNS after the fall the harm that brings.One: Router DNS hijackingYour local network connection DNS
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. In addition, the CentOS systems used in this case are all installed in the vmwarevm. Although this is not a problem
DNS spoofing technology principle and Security Protection Technology Overview: What is DNS spoofing?DNS Spoofing is the art of changing the original IP address of DNS. For better understanding, let's look at an example. If you want to use your browser to search for some information on Google, you can enter www.google.
Please let me know if there is something wrong or unclear in this article. thank you! DDNS configuration instances (DHCP + DNSDDNS) are a basic task in network management. However, as the network grows, it will be very troublesome to frequently modify data files in the DNS region. Therefore, dynamic DNS came into being. Please let me know if there is something wrong or unclear in this article. thank you! D
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