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If two events need to be called at the same time, mysql determines the order in which they are called. If you want to specify the order, you need to ensure that one event executes at least 1 second after the other event.他才跟人打过官司，说起来是头头是道。Since its basic attack principle is backlog overflow that depends on the end host connection socket, an obvious end host-based solution is to increase the backlog queue size, and this method has been widely used in most servers. Increasing the backlog queue is usually done by modifying the application's listen () function call and an operating system kernel parameter SOMAXCONN, which is used to set the upper limit of backlog that an application can receive. This method itself cannot be completely considered as an effective method to resist SYN flooding, even in some operating systems that can effectively support super large backlog queue allocation, because attackers can arbitrarily generate datagrams much larger than the backlog supported by their operating systems.Which chains can use the rules in the nat table: PREROUTING, OUTPUT, POSTROUTING (INPUT also in centos7, not in centos6)StimulateIn the case of a reflection attack, An attacker uses a controlled host to send a large number of packets, The special feature of these packets is that the destination IP address points to the server, router and other devices as the reflector, while the source IP address is forged as the IP address of the target. When the reflector receives the packet, it will think that the packet is a request sent by the attacked bird, so it will send the corresponding data to the target.敬文娘扑哧一声笑了。