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In TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue).伴随乾隆帝“禅位”钟声，“康乾盛世”降下帷幕。嘉庆皇帝，大清历史上一个悲剧皇帝，从父皇手中接过一个“千疮百孔”的帝国，在风雨飘摇中度过他的帝王生涯。在267年的大清历史中，嘉庆在位的25年只是这漫长岁月链条中短暂的一环，可他身处惊心动魄的动荡时代。康乾鼎盛达到顶点，大清江河日下，开始衰颓和败落；而西方世界摆脱封建桎梏，大踏步地走上资本主义殖民掠夺，给仍在昏暗中的东方古国带来危机与挑战。每日行进数十里，一部分身单力薄之人已经有些吃不消了，这才仅仅是个开始1948年春，保密局南京站二处侦防科科长李梅在一次行动中脑部受重创造成部分失忆，忘记了自己共产党员的身份。中共情报员佯装叛变设计让李梅的记忆复苏。和党组织恢复联系后的李梅配合组织完成任务，同时找准时机吸纳中央陆军大学战术教官高峰。保密局南京站站长胡一夫一直暗中监控李梅，李梅几次险象环生。期间她与高峰出生入死，擦出了爱情火花，结为连理。最终李梅协助高峰率部宣布起义，解放军百万雄师渡江，南京解放 。不是我老婆子偏心——就偏心也是常情——咱们总要向着自家人一些。Variable value: (This is the installation directory of jdk)这天天刚蒙蒙亮，黎水照常比别的军士起得早。