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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.From random import random?住在绿意盎然的边境村落·丹德拉的凛，是个稍有些贪吃、充满精神的女孩子。与可靠又温柔的姐姐·梅尔、以世界第一的科学家为目标的科学宅少年·阿尔、严格但满怀关爱的爷爷一起过着平稳的生活。In addition to bearing the weight and torque of the engine, the front subframe also absorbs the impact from the suspension. Compared with the aluminum alloy front subframe used in the previous generation BMW 3 Series, the steel subframe can more effectively resist the torque of the engine and the impact transmitted by the suspension, but the increased weight of the front will definitely affect certain handling performance.Public Object first ();