subject: Teach You From Scratch Analytical Troubleshooting Common Dns-dns, Troubleshooting - Education [print this page] In the actual application process may have the wrong DNS resolution problem, that is when we visit can not be completed when a domain name resolve to the IP address of its work, and can directly enter the website IP is the normal access, this is because failure caused by DNS resolution. The probability of occurrence of this phenomenon relatively large, so this article give you the reader from scratch to teach some basic rule out DNS resolution of errors.
One, what is the DNS resolution failures?
In general, as we visit www.163.com these addresses are called domain names, but we all know the network IP address of any of a host is identified, that is only know the IP address of this site can successful access operations.
However, as IP address information is not a good memory, so the network appears in the domain name, in visit, we need to import the good memories of this domain can be, the network will be there automatically into the corresponding IP domain name resolution address of the server, this is the DNS server. DNS resolution function enables the machine can be your own computer can also be a computer network, but when the DNS resolution error, for example, a domain name resolution into a wrong IP address, or do not know what a domain name corresponding What is the IP address, we can not access the site through the domain, and this is the DNS resolution failures.
DNS resolution failure occurs most symptoms is to visit the site corresponding to the IP address no problem, but the visit will be his domain error.
Second, how to resolve the DNS resolution failure:
When our computer failure occurred after the DNS resolution not to worry, the solution is simple.
(1) use nslookup to determine if that was the DNS resolution failure: To determine whether
100% DNS resolution failure on the system comes through the NSLOOKUP to resolve.
First step: Make sure your system is windowsxp windows 2000 and above operating system, and then "Start -> Run -> type" CMD "into the command line after the carriage return.
Step two: enter the nslookup command, Enter, to enter the DNS resolution query interface.
Third step: the command line window will show the current system used by the DNS server addresses, such as the author of the DNS server IP is 202.106.0.20.
Step Four: Next, you can not access the site enter the corresponding domain name. For example, I enter www.softer.com, if not access, then DNS can not resolve should be carried out properly. We will receive DNSrequest timed out, timeout was 2seconds the prompts. This shows that our computer is really on a DNS resolution failure.
Tip: If DNS resolution to work, then, will be fed back the correct IP address, for example, the address I use www.sohu.com query resolution, will get name: sohu.com, addresses: 61.135.133.103,61.135. 133.104 of the information.
(2) check DNS server is working properly:
This time we will look at your computer how to use the DNS address, and also check his operation.
First step: Make sure your system is windowsxp windows 2000 and above operating system, and then "Start -> Run -> type" CMD "into the command line after the carriage return.
Step two: enter ipconfig / all command to check network parameters.
Third step: in the ipconfig / all to display information in a place we can see written DNSSERVERS, this is our DNS server address. For example, the author is 202.106.0.20 and 202.106.46.151. As can be seen from this address is outside the network address, if you use external network DNS parsing error occurs, we can replace a DNS server address other problems can be solved.
Fourth step: If the DNS server in the office shows his company's internal network address, it shows your company's DNS resolution is to the company's DNS server to complete, then we need to check the DNS server , the DNS server nslookup on the normal operation to see if you can resolve.
