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Attack targets include: large amount of data operations, database access, large memory files, etc.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).666666666666刘小念前脚刚被带走，孟小蔷后脚就投奔到了黄家，还被安排在刘小念的卧室。(1) Take the department as a unit, and hold a forum on the 8th floor every cycle. The company provides melon seeds, fruits and the like, and speaks freely and organizes the forum in a pleasant and harmonious atmosphere.当他吃痛惨叫的时候，趁隙又将左手扣住的一枚银针刺进了他的脖子，脚下顺势一个扫堂腿，那人就倒地不起了。Tilt angle