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The first packet discarding scheme will have a slight impact on the user experience, because discarding the first packet retransmission will increase the response time of the service. In view of this, a better TCP Proxy scheme has been developed. All SYN data messages are accepted by the cleaning equipment and processed according to the SYN Cookie scheme. The IP address that successfully established the TCP three-way handshake with the device is determined to be a legitimate user to join the white list. The device disguises the real client IP address, completes the three-way handshake with the real server, and then forwards the data. However, if there is no IP address that shakes hands with the device three times within the specified time, it is determined that the malicious IP address is blocked for a certain period of time. In addition to SYN Cookie combined with TCP Proxy, the cleaning equipment also has the ability to detect a variety of abnormal TCP flag bit packets, and identifies normal access and malicious behavior by returning unexpected responses to SYN messages to test client responses.It is found that many beginners of design patterns have some characteristics, that is, after learning a certain design pattern, they seem to understand it, but they do not know how to use these so-called elite experiences and suffer from not knowing how to start. When I first learned design patterns, I had similar experiences. I shared my experiences, hoping to be helpful to beginners.对女人脸有自卑感的腐男宫野由美某个夏天，在校内遇到了吵架的场面。这个中年人穿过老板娘，在陈启身前停了下来。This is the end of the analysis of the article. At this time, look at the Android event distribution flow chart. This chart is drawn according to the above four situations. If you understand the four situations (at least give a way to intercept consumption and think of what the log of each event looks like), then it should not be difficult to understand this chart.