Shulou(Shulou.com)06/01 Report--

Years ago, it was found that the web page could not be opened or unusually slow when visiting baidu. At first, I thought it was an occasional situation, and no one reported it. After a few days, I found that this kind of situation still occurred, so I contacted Telecom ISP to help deal with it, because I have two telecom lines here, but the bandwidth is different in different access areas, one has a problem, the other has an abnormal phenomenon. According to the results of the telecom technicians' investigation, they think that their lines are normal, because all of our Client obtain the IP and DNS addresses through DHCP, but the DNS address is the IP address of the internal domain controller. They suggest that we manually configure a telecom public network DNS to test. Through the test, we find that there is some improvement, so we doubt whether it is caused by the setting of DNS. Through the nslookup test, we found that the IP of the baidu we parsed was a Hong Kong IP, and the resolution results of the two lines were the same, but the access of the other line was normal, so we fell into a dilemma. At this time, the telecom technician prompted us whether there was a problem with the forwarding address set for the domain control DNS. By checking, we found that the DNS forwarding address of the domain control was the Singapore address, and basically judged that there was a problem here. Therefore, the forwarding address is changed to the DNS of the local ISP. Through the test of the Client, it is found that the IP of all the resolved baidu are the server addresses of the baidu of the mainland, and the access speed and ping packets are normal.

This troubleshooting gives me a deep understanding of some basic concepts of domain control. Due to the lack of too much contact with domain control for a long time, it is impossible to determine the entry point quickly when there are problems. 51cto friends are welcome to give their opinions on domain control troubleshooting.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.