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20,000 Yuan Zhai Xingli's "Close-up" of 17 Deaths, Three Minutes of Life and Death in Guilin Dragon Boat Capsizing "Editor: Liu HaichuanIn 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).听到工作人员的解释，李聪云顿时一脸黑线，这什么和什么。Category: The attribute is used to specify the environment in which the current Action is executed;小葱含笑不语，快速扫一眼少年，跟他爹一样高大结实，微黑的脸颊，唇边生了一圈细细的绒毛，笑容朴实淳厚。There are three main reasons for the peculiar smell of automobile air conditioners. First, there is exhaust gas leakage from the external engine and foreign matter in the air inlet, which leads to unpleasant smell from the air inlet of the air conditioner. In this case, it is very good to check and go to the repair shop to open the cover for inspection, which can be clearly seen. Second, the air conditioning filter element is too dirty. Regular cleaning and inspection can completely prevent the occurrence of peculiar smell. Third, the air conditioning pipes and evaporators are caused by mold, which is also more troublesome and expensive to maintain. The first two situations are relatively simple and easy to check. The following focuses on the third reason, why mold can be produced in pipelines and evaporators. The following master will give you a brief introduction.