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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).　　原本与女儿相依为命的乔教授，偶然结识了女明星沈美凤，两个人一见钟情。乔教授决定迎娶沈美凤为妻。婚后，沈美凤将自己和前夫小混混许富贵的一对儿女许天磊和许天丽带到了乔家。可欣和父亲非常大度的接纳了他们，可欣以哥哥做称呼许天磊，以妹妹称呼许天丽，一家人开始了看似平静的生活。经济不甚繁荣的乌贼川市，名侦探鹈饲杜夫（玉木宏 饰）根本不关心没有报酬的杀人案，更热衷于替有钱家的阔太太寻找丢失的猫猫狗狗。拖欠房租的他偶然看到了一处低廉的招租信息，于是欣然前往，由此结识了新房东二宮朱美（刚力彩芽 饰）。二宫家境优渥，而且热衷于侦探剧，在大学还与一帮同好组成了推理协会。不管杜夫乐不乐意，朱美经常不请自来出现在事务所，并且积极参与到案件的调查中去。大学生户村流平（白石隼也 饰）涉嫌杀害前女友和学长，经鹈饲和朱美时而靠谱时而搞笑的推理侦查得以昭雪，并毛遂自荐要拜在鹈饲门下修行。午夜2点，玫瑰园小区附近突然响起枪声，市外贸局长裘成贵倒在血泊里，市刑警支队副支队长朱光奉命接手此案，公安局长南平却收回命令，要朱光把案子交给副支队长史金浩负责………,出来吧。