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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.Respiratory changes may lead to dyspnea or acceleration, or congestion caused by respiratory secretions, resulting in clicking and coughing.15.6 eyes and their accessory diseases were cured with unqualified eye dysfunction.讲述一个女人游走在四个男人之间，究竟是因为真爱还是因为贪婪呢？《白发魔女传》的一个铁粉看到天启的留言，立刻生出如此想法。The second floor is mine