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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).三万越军入城的阵势震撼不已，城头前来的山yīn现如今的守军，还有前来迎接越王的众多的士绅官僚，都大为惊叹，越王有此精兵在手，少不得让他们忌惮。3. Destroy Shooting Power Ratio红衣少女脸sè这才好转一点她知道二哥也是颇有为难之处。王穷笑道：自来民间藏高人。Return new Memento (value);