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Network firewall: It is often located at the entrance or edge of the network, and is protected against the entrance of the network and serves the local LAN behind the firewall.Definition and Naming of MDT……之后终于打破了长达10年的沉默，重新启动了项目。成为传说的第一神剑传说倒是确有其事，可那毕竟只是一个传说，几百年前一个女人的临终祝愿当真能够实现？即便是承影剑握在手中，绿萝对此还是不大相信。一阵风似的，这些人消失在夜幕中。At present, what methods do we take to solve the attack? The first method shortens the waiting time and deletes the illegal request data packets waiting in the waiting queue as soon as possible. The second method is that the first handshake message is not put into the waiting queue. We return a 32-bit unsigned integer to the client as the Seq of the second handshake. The integer is obtained by adding a serial number of the server to the parameters requested by the user (including the requested address, port, etc.). If it is a normal user, it adds 1 as ACK after receiving this integer and returns it to the server. After receiving the data, the server subtracts 1 from this ACK and then performs inverse operation to obtain various parameters. Finally, the data sent out are compared. If they are completely consistent, it means that it is an effective response and stored in the corresponding data structure, otherwise it is not. Through this method, illegal requests cannot occupy system resources.