. Everyone has heard about DNS. DNS is a very professional term. It is a core service of the Internet. It is an abbreviation of the domain name system. It is a distributed network that can map domain names and IP addresses to each other. The database makes it easier for people to access the Internet without having to remember the IP strings that can be read directly by the machine. Since the role of DNS is so powerful, what should you do if there is a DNS resolution error? Today, Xiaobian will explain this to everyone, and I hope to help the friends who often do the work.
Because the IP address information is not Too good memory, so the name of the domain name appears in the network, we need to enter this good memory domain name when accessing, there will be a server in the network that automatically resolves the corresponding domain name into 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.
When there is a DNS resolution failure on our computer, don't worry, the solution is simple.
(1) Use nslookup to determine whether it is a DNS resolution failure:
To be 100% judged whether the DNS resolution failure needs to be solved by the system's own NSLOOKUP.
First step: Confirm that your system is Windows 2000 and Windows XP and above, and then enter the command line mode by pressing Start->Run->Enter CMD
Step 2: Enter nslookup command and press Enter to enter the DNS resolution query interface.
The third step: 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. If you can't access it, DNS resolution should not work properly. 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.
Small Tip: If the DNS resolution is normal, it will feedback back to the correct IP address.
(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.
First step: Confirm that your system is Windows 2000 and Windows XP and above, and 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 the DNS server. , nslookup operation on the DNS server to see if it can be resolved normally. Solve the DNS service failure on the DNS server, and generally the problem can be solved.