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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).现实中的恋爱，未必能修成正果，网络上的相交相知，也不都是一场空，一切都要看自己。You may also like:}虞子期笑问道：霸王，有什么好消息？虞姬含羞地低下头去，项羽笑道：你呀……就快要当舅舅了。新作品由笨蛋主义、香蕉男成员日村勇纪、若林、水川麻美出演。本剧以原案以及担任主要作家的笨蛋主义为执笔业而借来的东京都内的“工作场所”为舞台，将播出他们“特别是什么都不会发生的集会”的模样。As mentioned earlier when summarizing and viewing commands, the--line-number option can be used to list the sequence numbers of rules, as shown in the following figure.