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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.看上去比曾鹏要正气些。Step 4: Final Implementation Means季木霖尝了口咸淡，徐风也想尝，却被禁止了。小朋友们，今天拼图游戏的小火车，你们猜到了吗？　　17岁的职业将棋手桐山零，年幼时失去亲人，孤独的他在与川本三姐妹的相处中不断成长，逐渐找回了失去的东西。　　讲汽车