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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).第一卷附赠OVA　　由于海叔年事已高，其江湖地位被新崛起的汪(黄秋生)所取代，汪也很欣赏浪，浪为了进一步掌握军火集团的正确资料，把心一横，干掉海叔，籍以证明自己对汪不二之心。汪大喜，吸纳浪为其头号马仔。袁不知道浪的真正身份，追捕浪，两人拼得你死我活，袁深感此人身份极可疑，后得悉浪是卧底神探，便设法跟浪联络，希望一同破坏汪的罪行。　　金多美饰演赵以瑞，她是有着神赐予的头脑的“高智能”且具备独特魅力的人物，是SNS明星也是网络影响力人物，具备天使般的外貌和反转性格。她和朴塞路因为恶缘而结缘并一起在梨泰院发展。作为捕手和击球手的走一郎非常的活跃。而投马由于某些原因而担任三垒手，却拥有着作为投手的才能。走一郎的亲妹妹同时也是投马无血缘关系的义妹·立花音美也进入了初中，三人之间的氛围也发生了一些变化。是同情，他坚决不承认自己是心疼。板栗又道：皇上和众位大人休怪三爷爷和我外公莽撞，实在是他们心思淳朴，想不通像胡镇这样的。