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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).寨中一间茅草棚前，十几个粗糙的汉子正愁眉相对。A dozen means 12, and a dozen socks means 12 pairs.The adapter mode of the object12. The term "poor visibility" refers to any situation where visibility is restricted due to fog, haze, snow, storms, sandstorms or any other similar reason.为什么？因为白虎将军已经是人家的夫婿了，她们怎好太痴迷呢。话音落地，李左车已然起身离开。