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Then change the code to the following:Reset authentication takes advantage of the reliability of TCP protocol, and DDOS protection system responds to syn first. When the protective device receives syn, it responds to syn_ack and sets the Acknowledge number to a specific value (recorded as a cookie). When the real client receives this message and finds that the acknowledgement number is incorrect, it will send a reset message with a sequence number of cookie + 1. The source of the forgery will not have any response. In this way, we can add the real client IP to the white list. ?-Skills that can easily get feedback are suitable for self-study. For example, when programming and debugging run away, you will know what goes wrong. Continue to take English as an example. If you find some words and roots that you are not familiar with, add them to your favorites and repeat them when you are free. If you find that you cannot understand grammatical difficult prepositions, you need to read and learn about them. Feedback is very important, which determines whether learning is mechanical repetition or virtuous circle.《无耻之徒》正式续订第9季。该剧已成为showtime最长寿+收视最高的台柱，续订理所当然。经历第8季涨薪风波后，第9季也早早宣布“老爹”William H. Macy和“大姐”Emmy Rossum带领的全员回归。True or False因此当机立断是最好的办法。