Lan Internet access problem solving process

A few days ago, after I changed the IP address, I suddenly couldn't access the internet. I thought it was an IP conflict, so I changed another one, so I changed N, but I still couldn't get it. After each change, I showed that I was connected, A few seconds later, the display was limited. I thought it was the reason for NIC driver. I unloaded and loaded it again. After n times of repetition, the wood had any effect. Later, I thought it was the hardware reason. I pinged the IP address of other machines in the LAN and pinged it. This shows that the NIC should still be able to send and receive data, but why cannot I access the Internet? The problem diagnosis that comes with Windows Startup shows that DNS is not responding. (later I found that this Nima pitfall is caused by too many reasons), so I started to check whether the DNS Service has started, I changed several frequently-used DNS servers, and Google is the same. In short, it won't work. Later, I had no choice but to connect to wireless networks. It was a waste of time. However, wireless connection suffers from a headache. After a while, the connection will be dropped once. You must restart the software to connect to the Internet. So I began to find the reason. In fact, it is not difficult to find the reason. I have been ruled out for the local reasons, so the reason may only be on the server side of the LAN. Since the computer can send and receive messages normally, the possible reason is that the information sent out is not received by the server, but it is obviously impossible, because after I change the IP address, the network will change from restricted to connected, it indicates that they are still interconnected. The reason may be that the computer's Internet access application is rejected. After confirming the cause, I began to find a solution. I remember that when the school network was unstable last semester, I learned how to bind a MAC address to avoid ARP attacks. So I tried it, however, it did not work. Although my ARP Address still failed to access the Internet, the problem of Unbinding ARP still persists. What is the reason? I went to Baidu and found that changing the MAC address can solve many network problems in the LAN. Whether the MAC address is blocked or bound to an IP address that cannot be changed, I forgot the IP address, you can modify the MAC address (conjecture ). Then I tried it and it was a success. I finally got online happily. ^_^