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The attacker first forged the address to initiate a SYN request to the server (can I establish a connection?) The server will respond with an ACK + SYN (Yes + Please confirm). The real IP will think that I did not send the request and did not respond. The server does not receive a response and will retry 3-5 times and drop the connection after waiting for a SYN Time (typically 30 seconds-2 minutes).Updated December 25(Tickets purchased at the ticket vending machine are green on the top and tickets purchased at the manual window are orange on the bottom)尤其是张耳，之前被陈余那样的攻打和欺负，早就是满腹怨恨了，现在终于有机会报仇，自然不会轻易放过。A year later, a friend of Xiaobian's came to Nagoya to play and asked Xiaobian about the scenic spots recommended by Xiaobian. Xiaobian said this sentence without thinking:This strategy is mainly implemented by imposing rate limits on scarce resources such as IP and accounts. A typical example of this rate limit is to require the user to resolve the verification code to verify whether he publishes too frequently, as shown above.[Reissue] First Certificate of Wuxi Enterprise: 35 yuan/Zhang; One Family with Multiple Certificates: 50 yuan/Zhang Nanjing Human Resources and Social Security Bureau: http://www.njhrss.gov.cn/