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DNS is an application-level protocol, and DNS provides a mechanism for translating a human-readable hostname or domain name into a computer or network-readable digital address, making it possible for the wide application of the interconnection network. I. Basic concepts related to DNS (1) Domain name and top-level domain 1) Domain name Domain name is typically t

Article Title: DNS resolution process. 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. When the DNS client needs to query the name of an application, it will contact its own DNS server to resolve the name.

With the gradual popularization of networks, network security has become the focus of the INTERNET. It is related to the further development and popularization of the INTERNET, and even to the survival of the INTERNET. Fortunately, our INTERNET experts did not disappoint INTERNET users, and network security technologies continued to emerge, giving INTERNET users and enterprises more peace of mind, the following describes the main technologies in network security, hoping to provide a network secu

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

first, what is DNS. DNS (domain Name System) is the abbreviation for the name systems, a computer and network service naming system that is organized into a domain hierarchy that is used by TCP/IP networks and provides services for converting host names and domain names to IP addresses. You can think of it as a huge phone book.For example, if you want to access the domain name math.stackexchange.com, first

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

How to empty the DNS cache for LinuxI. Empty DNS cache under Linux There are usually two ways to implement a DNS cache implementation under Linux:One is to manage the DNS cache with the DNS cache program NSCD (Name Service cache daemon).One way to implement

Network communication is mostly based on TCP/IP, while TCP/IP is based on IP address, so the computer can only recognize the IP address such as "202.96.134.133" when communicating on the network, but cannot know the domain name. We can't remember sites with more than 10 IP addresses, so when we visit the site, more is in the browser address bar to enter the domain name, you can see the required page, this is because there is a call "DNS server" comput

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