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We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.性格相合最坏的2人织成的×杀手”的悬念。公元未来某年，春节零时。新港半岛的市民沉浸在节日的欢乐气氛中，新港市近海区域，石油钻探公司的天然气开采平台将物理探杆钻到海下时，突然一种莫名的气体冒了出来。气体遇物理摩擦起火燃烧，且越烧越旺，致使平台发生大爆炸，打井工人全部遇难。勘测小组前往调查真相……As mentioned earlier when summarizing and viewing commands, the--line-number option can be used to list the sequence numbers of rules, as shown in the following figure.你睡觉真不老实呢。DDoS attacks can be divided into heavy traffic attacks, TCP state exhaustion attacks or application layer attacks. In Kapersky's DDoS Attack Report published in the second quarter of 2011, HTTP flood attack is the most common DDoS method, which is an example of application layer attack. The dominance of application layer attacks reflects that the rapidly evolving DDoS has broken away from the traditional direction of large traffic attacks.