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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.　　一次意外撞车，陈重结识了叶梅。5.2 for exampleShandong Province昭和四大奥特曼与平成四大奥特曼的豪华大集结！本剧讲述了30多岁的两位主角，通过一款美食家交友APP认识后，一同踏上了美食之旅。两人一边享受着西班牙干腌火腿、日本拉面和世界各地的美食，一边了解着彼此。对日本香橙的共同喜爱，对美食家装模作样的厌恶，让两人心灵相通，但两人过往感情留下的伤疤所激发的不安感和摇摆不定，可能会阻止他们品尝到真爱的味道。To give a comprehensive example, you can look at it according to the above figure. According to the source channels of users, do targeted germination retention. For example, this source channel is a red envelope download from Android application market or a bonus game on WAP side, so this part of users can be considered as profit-seeking, and there can be corresponding profit-seeking activities on the landing page of the client, which can improve retention.