recursive dns

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

@ Zheng yu Summary I. symptom: Java httpclient initiates an HTTP request to the WebService interface under the x××× open. x××. com domain name from the master station data center, which is extremely slow. Troubleshooting: 1.1. wget test results No Specify the IP protocol and the interface for wget to access it. The time is 4.163 seconds, which is basically a waste of host parsing. If the IP protocol of the specified wget is IPv4, The wget test takes only 0.096 seconds. 1.2. WGEtCompari

When NetlogonWhen the service cannot register or cancel registering multiple resource records, the System Event Log will recordNetlogon5781Error message. The event description does not contain the names of these resource records. In addition, the event description may be "no ",DNS servers are available ", note: the common cause of these errors is that the domain controller references itself as the DNS

[Daily] DNS iterative Query Process and dns query Process DNS is an application layer protocol, and the port numbers are tcp/53 and udp/53.DNS query process, such as accessing www.test.com1. The client queries www.test.com2. query the preferred DNS server, in Linux/etc/re

In the previous blog, we described how to create a common DNS record in a DNS server, and in this article we'll show you how to configure a secondary server for DNS, as well as a stub zone similar to a secondary zone. A DNS secondary server is a fault-tolerant design, considering that once a

/56/wKiom1Pg3ujiqZtaAAEXjRaqWkI086.jpg "title=" DNS access. png "alt=" wkiom1pg3ujiqztaaaexjraqwki086.jpg "/>The WWW host under LLH wants to access the WWW host under 51cto, but the DNS server in the LLH domain does not have 51cto domain name resolution information.1) At this time, the LLH domain DNS server began to access the root server, asked if there is 51cto

Today, when I look at the source code of a website, I found the Here is a brief description of Dns-prefetch found on the internet. DNS implements the mapping of domain names to IP. Access to the site through the domain name, each request to do DNS resolution. At present, the DNS resolution is usually below 200ms ea

Modify DNS in Linux and dns in linux Not long ago, I encountered some problems on the server. I need to modify the dns configuration of the server and write it down. I used centos 6.5. The DNS configuration file is in/etc/resolv. conf, but the service network restart is restarted after modification. If it is opened a

How to change the DNS settings for IOS devices The first step: we click "Set" in Iphone6 standby and then open it into the details below. Step two: Now we're going to click on wi-fi"Wireless LAN" Here we want to find ourselves using Wi-Fi network. " As shown in the following figure Step three: Then, as shown in the following figure, the previous selection is the WiFi we are on, and we click the "Show Info" button (the letter "i") on the

Each entry in a database is called a resource record (RR) Resource record format: The second field in the first section, the third field, the fourth field (resource record type), and the fifth field Name TTL in (Internet) rrtvalue If TTL is not written, you must specify a default value in the global variable. The TTL value can be omitted. TTL 600; For example: Name [TTL] inrrt (resourcerecordtype) Value Www.zledu.com. ina1.1.1.1 1.1.1.1inptrwww.zldu.com. (reverse resolution) Resource Reco

First, the early topology map planning DNS dual NIC; eth0:192.168.6.248 eth1:192.168.7.248 Telecom users: 192.168.6.X this network segment analog IP address 6.248 6.244 Unicom Users: 192.168.7.X This network segment analog IP address 7.248 7.244 Other users: any Site Cluster Address: Telecom Access: 192.168.1.1 192.168.1.2 Netcom Visit: 192.168.2.1 192.168.2.1 Other users: 192.168.3.1 192.168.3.1 Second, the configuration of rsync services,

The installation of DNS servers and clients is briefly described in the previous section. Although there are few knowledge points involved, there are already two parts of the DNS system that are indispensable, that is, DNS servers and clients, and the DNS system includes zone and resource records, which are primarily d

How does the DNS for Linux be set up? How to modify DNS addresses under LinuxHttps://jingyan.baidu.com/article/870c6fc32c028eb03fe4be30.htmlThe location of DNS settings under Linux is primarily,1 network card settings configuration file inside the DNS server address settings, 2. System default

the DNS host closest to the domain that controls test.com.cn. The originally queried DNS server in Step 9 sends a request to the DNS server in the test.com.cn domain to search for www.test.com.cn after receiving the location where the query should continue, at last, the IP address of the host www.test.com.cn will be found in the

called a secondary server for this zone.Query mode for DNSWhen the DNS client queries the DNS server for an IP address, or when the DNS server queries the DNS server for an IP address, it has two query modes:recursive query :When a DNS client makes a request, if there is no

addition;// Number of additional resource records;} DNS, * PDNS;In the 16-Bit Flag, the QR Code determines whether the query is a query/response message. The opcode identifies the query type, the AA determines whether the answer is an authorized answer, and the TC determines whether the query can be truncated, RD determines whether a recursive query is expected. RA determines whether a

Preface:If you are lucky to be seen by a friend and find something wrong in this article, you may want to criticize and correct it. If you have any questions, we hope you can discuss them together. Because I have not registered a valid domain name, I only need to configure the DNS server in my LAN. DNS Environment Planning Vm ip Address: 10.170.2.10 master DNS