National top-level domain root server failure a large number of web sites inaccessible

January 21 News, today around 15:10 P.M., the domestic common top-level domain root server resolution exception, some domestic users can not access the. com Domain name Web site.

Some users visit the site, will be jumped to 65.49.2.178 this IP address, resulting in the real site can not be successfully accessed. After the failure occurred, all the common top-level domain name in the territory of the visit there are problems, the current reason is not clear, the possible reasons for two, one is the root problem, the second is the domestic link problems.

16:18 P.M.: The domain Name Service provider Dnspod said that the root is now back to normal, but there may be a return of the wrong IP address, because there are caches, some areas of the fault may last 12 hours.

Dnspod founder Wu Hongshong to Tencent Science and Technology said: The fault situation is very serious, the domestic two-thirds DNS in a state of paralysis, users can not access, the situation is gradually recovering. The Domain Name Service provider is assisting the Government related department to troubleshoot the reason, now the reason is unknown, but has nothing to do with dnspod.

Query 65.49.2.178 information and found that the IP is located in the U.S. North Carolina City of the dynamic Internet Marvell Company. A large number of well-known IT companies in China's domain name was resolved to a U.S. company. Jinshan Poison PA Security experts believe that the incident is highly likely to be a man-made hacker attack.

The root server is primarily used to manage the home directory of the Internet, with only 13 units worldwide. 1 primary root servers, placed in the United States. The remaining 12 were supplemented by root servers, of which 9 were placed in the United States, 2 in Europe, in the UK and Sweden, 1 in Asia and in Japan. All root servers are managed by the United States Government-mandated Internet domain name and number distribution agency, ICANN, for global Internet domain name root servers, domain name systems, and IP addresses.

It is reported that 114DNS has resumed normal service, but most of the domestic operators default DNS is not working properly. If you do not have access to the Internet, you can consider your computer's DNS set to 114.114.114.114, Standby DNS is 8.8.8.8.

What is DNS

DNS is the abbreviation of domain Name System, is a core service of the Internet, it is a distributed database that can map domain name and IP address to each other, it can make people access the Internet more conveniently, without remembering the IP string that can be read directly by machine.

People are accustomed to memory domain name, but the machine only recognize each other IP address, domain name and IP address is one by one corresponding, the transformation between them is called Domain name resolution, domain name resolution needs to be specialized domain name resolution server to complete, the whole process is automatic. When your site is finished and uploaded to your virtual host, you can directly in the browser to enter the IP address to browse your site, you can enter the domain name query your site, although the resulting content is the same, but the call process is not the same, the input IP address is directly from the host to invoke content, The input domain name is through the domain name resolution server to the corresponding host's IP address, then calls the content of the website from the host.