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Sorry. . Misleading. 300 defense force is the misleading mistake of actual defense force.We call a collection of rules that have the same functionality a table, Therefore, we can place rules with different functions in different tables for management, and IPTables has already defined four tables for us, each table corresponds to different functions, and the rules we define cannot escape the scope of these four functions. Therefore, before learning IPTables, we must first understand the function of each table.How to Turn on "Excellent Performance" Mode:　　米德威奇，一个上班族居住的英格兰小镇，自由开明、渴求进步，由各种小家庭和富人街组成。这里没有太多的事情发生，其中也有着充分的理由。Introduction: This action is usually used when congratulating others.Invoke invokes the delegate's instance method to execute the methodDDOS attacks mainly occur in the network layer. Its most obvious characteristic is to send a large number of attack packets, consume network bandwidth resources and affect normal users' access. At present, the detection and defense technology for DDOS attacks in the network layer is quite mature, and at the same time, some new attack methods-DDOS attacks in the application layer have emerged. Different from network layer DDOS attacks, application layer DDOS attacks mostly imitate the access behavior of legitimate users and will not generate a large number of attack data packets during data transmission, but they will consume server resources through a large number of database queries and other operations, which is more difficult to detect. According to the different attack modes, DDOS attacks include reflection amplification attacks in addition to ordinary flooding attacks. This type of attack often uses a legitimate server as a reflector, which sends a large number of data packets to the target, thus causing greater harm. At present, DDOS attacks against DNS servers are also common. Attackers often send fake domain names to DNS servers, consuming DNS server resources. At the same time, due to the recursive query mechanism in DNS servers, DDOS attacks against DNS servers have a large impact range.