After you have your own domain name, you need a DNS server to resolve your domain name. The role of parsing is to inform your visitors that your website is on which IP host.
The DNS server is provided by your domain name registration company. If you register a domain name in a company, it will be provided by the company. You don't need to make any settings, just keep the default options.
You can change the settings of your domain at any time, for example, you can point it to a different IP. When you change the settings of the domain name, the DNS servers of the world will be notified one by one. In this way, Internet users around the world will be guided to your new host. There is a process for notifications. It takes about 24 hours to refresh the DNS servers around the world and learn about your changes.
Generally speaking, the URLs we visit are, for example, www.xkq.com. These addresses are called domain names. It is well known that any host in the network is identified by an IP address, that is, only knowing The IP address of this site can successfully implement access operations.
However, because the IP address information is not well remembered, the name of the domain name appears on the network. When accessing, we need to enter the domain name of this good memory. The network will automatically have the corresponding domain name. A server that resolves to an IP address. This is the DNS server. The machine that can implement the DNS resolution function can be either its own computer or a computer in the network, but when DNS resolution is wrong, for example, parsing a domain name into a wrong IP address, or not knowing the corresponding domain name at all. When the IP address is, we can't access the corresponding site through the domain name. This is the DNS resolution failure.
The biggest symptom of DNS resolution failure is that there is no problem with accessing the IP address of the site. However, accessing his domain name will result in an error.
Don't worry when our computer has a DNS resolution failure. The solution is simple.
(1) Use nslookup to determine whether it is a DNS resolution fault:
To be 100% judged whether the DNS resolution fault needs to be solved by the system's own NSLOOKUP.
Step 1: Confirm that your system is Windows 2000 and Windows XP and above, then enter the command line mode by pressing "Start -> Run -> Enter CMD".
Step 2: Enter the nslookup command and press Enter to enter the DNS resolution query interface.
Step 3: The command line window will display the DNS server address used by the current system. For example, the author's DNS server IP is 202.106.0.20.
Step 4: Next enter the domain name of the site you are unable to access. For example, if the author enters www.***.com, if it cannot be accessed, then the DNS resolution should not be normal. We will receive a prompt message for DNS request timed out, timeout was 2 seconds. This shows that our computer does have a DNS resolution failure.
Tip: If the DNS resolution is normal, it will feedback back to the correct IP address. For example, the author uses the address www.***.com for query analysis, and will get name:ciidnet.com, addresses: 61.135 .133.103, 61.135.133.104 information.
(2) Query whether the DNS server works normally:
At this time, we have to look at the DNS address used by our computer and query his operation.
Step 1: Confirm that your system is Windows 2000 and Windows XP and above, then enter the command line mode by pressing "Start -> Run -> Enter CMD".
Step 2: Enter the ipconfig /all command to query the network parameters.
Step 3: In the ipconfig /all display information we can see a place to write DNS SERVERS, this is our DNS server address. For example, the author is 202.106.0.20 and 202.106.46.151. From this address, it can be seen that it is an external network address. If there is a parsing error in the external network DNS, we can replace the other DNS server address to solve the problem.
Step 4: If the internal network address of your company is displayed at the DNS server, then your company's DNS resolution is done to the company's internal DNS server. In this case, we need to check. This DNS server performs nslookup operations on the DNS server to see if it can be parsed normally. Solve the DNS service failure on the DNS server, and generally the problem can be solved.
(3) Clear DNS cache information method:
When the computer accesses the domain name, it is not necessary to seek help from the DNS server every time it is accessed. Generally, when the parsing work is completed once The parsing entry will be saved in the computer's DNS cache list. If the DNS resolution changes, the DNS cache list information will not be changed. When the computer accesses the domain name, the DNS server will not be connected to obtain the latest parsing information. Will be resolved according to the cache correspondence stored on your computer, so there will be DNS resolution failure. At this point we should solve the problem by clearing the DNS cache command.
Step 1: Enter the command line mode via "Start -> Run -> Enter CMD".
Step 2: In the command line mode we can see that there is a parameter named /flushdns in ipconfig /?, this is the command to clear the DNS cache information.
Step 3: Execute the ipconfig /flushdns command. When the prompt "successfully flushed the dns resolver cache" appears, the current computer's cache information has been successfully cleared.
Step 4: When we visit the domain name again, we will get the latest resolution address on the DNS server, and there will be no problem with the parsing error caused by the previous cache.
(4) Modify the HOSTS file method:
Modifying the HOSTS method is to modify the DNS resolution correspondence in the HOSTS file to achieve the purpose of correct parsing. Because the HOSTS file in the local system is first viewed when the local computer accesses a domain name, the resolution relationship in the HOSTS file is greater than the resolution relationship on the DNS server.
This way, when we want to bind a domain name to an IP address, we can do this by adding a parsing entry in the HOSTS file.
Step 1: Pass "Start -> Search" and look for the file named hosts.
Step 2: Of course, readers who already know his path can go directly to the c:\\windows\\system32\\drivers\\etc directory to find the HOSTS file. If your system is Windows 2000, you should look in the c:\\winnt\\system32\\drivers\\etc directory.
Step 3: Double-click the HOSTS file and select Open with the Notepad program.
Step 4: After that we will see all the contents of the HOSTS file. By default, there is only one line of content "127.0.0.1 localhost". (Other lines with # before are not real content, just help information)
Step 5: Add the entries you want to perform DNS resolution to the HOSTS file. The specific format is to write the domain name first. Corresponding IP address, then space to receive domain name information. For example, the author added two entries "211.153.80.1www.xkq.com" and "10.82.0.1www.***.com".
Step 6: After setting up, we will automatically analyze whether it is based on the internal network or the external network when we visit www.***.com.
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