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而且三川和东郡一带的秦国残留兵力尚未肃清，沛公刘邦也会过去帮忙，少将军和范老先生一时怕是回不来。The essence of the mirror server mentioned in the previous section is to build a miniature CDN by itself. The same is true behind the high-security IP provided by major cloud service providers: the website domain name points to the high-security IP, which provides a buffer layer to clean traffic and cache the content of the source server.你也不用多说，没事的时候多注意他些，有事再来找本官。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.