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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).Write according to your own thinking, finish and then take out magazines to compare and revise, and correct your own version.故事发生在现实而又荒诞的胡海镇，主人公否否是胡海镇上一个普通的青年，他默默无闻，却有着双重身份，当有人在行为上越过了他的道德底线，便会变身成禽兽超人，专打禽兽不如的人，通过独特的镜头语言和艺术表现手法，诙谐、幽默的讽刺和抨击社会的阴暗面。从客观的角度批判生活中的丑恶现象，弘扬正义。本季主要讲述胡海镇因为雾霾弥漫而导致动物体内出现珍稀的宝石-霾石，而李镇长为了消除雾霾投巨资建设的上气下调工程也因此变得暧昧起来，李镇长、贾巨发和禽兽超人围绕霾石展开各种对抗和纠葛…After the screen prompt icon as shown in the figure, the recovery mode entered successfully. After connecting to itunes, you will also be prompted that you have entered recovery mode.下更预计晚八点。After adjustment, I finally arrived in Guilin. It took 12 minutes. Guilin is very big. I wonder if Google is special.