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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).一部关于一对年轻夫妇探索开放关系的喜剧。他把筷子往碗上一架。在12岁生日那天，薇拉·沃德收到一份猫咪礼物，为她的密友们打开了一个充满魔法、会说话的动物和众多新奇事物的世界。Gear:吴环宇被安排去接替父亲参与管理企业，却整日沉迷电子游戏，母亲杜茗一气之下将他轰出家门，开始了流浪生活。杜茗暗中安排网络高手与他在网上较量，吴环宇输掉游戏，只能答应对方去打工，杜茗无论在生活上还是生意上处处与他做对，将吴环宇逼向绝境，却逼出吴环宇淘到了第一桶金。杜茗输了，却用自己的智慧换来儿子的成熟。