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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).秦旷却很是赞了她一番，安慰道：这已经很不错了，你还小呢。Var players = [];It will be slow to start fishing.正值壮年的卸岭盗魁陈玉楼伙同罗老歪一探湘西瓶山元将之墓。却不想其中机关重重，几次均未得手，死伤甚众。于是陈玉楼联络搬山道人，告知瓶山中有千年丹丸，四处寻找雮尘珠的鹧鸪哨为之心动， 决定一同前往瓶山......高拱怒道：张居正。Public class State {