Each IP address can have a host name that consists of one or more strings separated by a decimal point. With the hostname, do not memorize each IP device IP address, just remember the relative intuitive meaningful host name on the line. This is the function that the DNS protocol will perform.Today we will discuss DNS servers, especially Linux DNS servers, and how
About the dns resolution and mx record of the email server!
How do I make MX resolution records for domain names? --------------------------------------------------------------------------------Most SMTP requests an MX record to point to a host name. Therefore, specify an MX record to a host name instead of an IP address. For example, to set 218.5.1.249
Request -----> Local/etc/hosts# If there is resolution in the host file, the parsing result of the host file will be returned without any further steps
----> Local DNS Cache# Search for the local DNS Cache. If yes, the system returns the result and there is no next step.
----> Find the first dns server ----> Find th
the forwarders list does not answer, the host will go to find the answerForwarders {192.168.100.20;}; Forwards all incoming DNS requests to the 192.168.100.20 server};Logging {Channel Default_debug {File "Data/named.run";Severity dynamic;};};Zone "." in {Type hint;File "named.ca";};2. Using named-checkconf to detect named.conf syntax[Email protected] ~]# named-checkconf/etc/named.conf[Email protected] ~]#3
Tags: cal grep nslookup no direct directory netstat images resRelated concepts:Forward parsing: Resolving a domain name to an IP addressReverse parsing: Resolving IP addresses to domain namesEnvironment: Linux Server One, IP address: 192.168.80.10The first step: Getting Ready for work[[email protected] ~]# yum install bind//Installation DNS service[[email protected] ~]# systemctl stop FIREWALLD//Turn off fi
There are many solutions, such as using Windows2000 or WindowsServer2003 to provide Network Load balancing services, but the settings for this service are complex. And it is a simple method to realize Network Load Balancing through DNS server.
The author takes the Web server in the enterprise network as an example to introduce how to use the
At present, many enterprises and institutions have set up units within the LAN, the internal network are equipped with related servers (such as Web, FTP and other servers). Internal network users want all servers to use domain names to access, network administrators can use the way to build a DNS server to achieve.
Set up a DNS
resolution.The primary name server maintains a local database of a specific DNS zone, with automatic control of the parsing recordsis the only authoritative server and official server in the designated area. When building the primary domain name
also query any type of DNS records and transmit the information of the entire region of a domain. When called without parameters, nslookup displays the name server it uses and enters the interaction mode.
At the '>' prompt, you can type any domain name you want to query. By default, it requests A records, which contain IP addresses related to domain names.
You can change this type by issuing "set typ
In fact, the DNS under RHEL5 is neither simple nor complex, but the DNS File Location of RHEL4 is quite different. However, after several days of painstaking research, the hard bone was finally cracked down. DNS servers in Linux are divided into the following types: 1. The primary function of the cache Domain Name Server
Set up a DNS server on the internal network that allows users to enter the IP address of the internal network DNS server in their computed DNS server IP address. A forward, directional lookup zone is established on the
Configuration
1. DNS configuration file/Etc/hosts is the IP address file of the earliest hostname;
/Etc/resolv. conf: This is important! It is the IP address record of the ISP's DNS server;
/Etc/nsswitch. conf: whether to use/etc/hosts or/Etc/resolv. conf setting!
In general, the search for the default host name and IP address in Linux takes/etc/hosts as the pr
) used by the NetWare network. Gateways are also known as IP routers.What is the default gateway? The default gateway means that if a host cannot find an available gateway, it sends the packet to the default designated gateway, which handles the packet. The gateway used by the host is now generally referred to as the default gateway.DNS server:DNSRefers to the domain name server. InThe domain name on the internet is one by one corresponding to the IP
Create a DNS server on Linux-Linux Enterprise Application-Linux server application information. For more information, see. I. Assumptions
Many DNS articles start with the DNS principle. From the perspective of my use, I will provide some simple and practical application inst
Work Assignment DescriptionCompany name is ABC company, build DNS server. Head office in Beijing, the company's registered domain name is ht.com. Your company has two branches, the first for Asian companies (Asia), the company is headquartered in Beijing, the second is a European company (Europe), please set up a DNS on the head office
DNS server is actually a domain name resolution system, the prerequisite is only that two virtual machines can ping the same can, so can be in the basic network configuration alone, or you can follow the DHCP server to practice, but we used to ping the IP address, now become ping domain name (example: Ping www.qq.com)DNS
Tutorial Background:The company's current network environment is accessible to all users above the internet, and the DNS used is obtained through the DHCP server, the DNS address entered on the DHCP server is a registered DNS server
Event Causes and analysis
This incident is a linkage event, mainly divided into two parts:
1, the Dnspod site's DNS server by more than 10Gbps traffic DDoS attack the suspect because it is the competition between the network game between the business, causing a server operators launched thousands of zombie hosts to Dnspod launched a DDoS flood attack, Causes the
Hosts file), a recursive query request is sent to the specified DNS host, and if the DNS host does not have resolution information for that domain name, it will continually iterate over the DNS host, where the highest level (authoritative) root DNS host has 13 units. The fo
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