(Wireshark, an essential tool for learning the network, is a valuable video tutorial to share with you. The tutorial is divided into three parts: part1, part2, and part3. You need to download all of them to complete the decompression. Because you are uploading files for the first time, you are not familiar with the process, so I didn't put them in At the same time, friends can find the other two parts to download by themselves)