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Recommendation of Hot Joining Projects: Hu's Large Plate Chicken Joins Big Official Rice Noodles Joins Meimao Maocai Joins Gao Jimi Joins Jin Fuxiang JoinsWe 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.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.天启有那么多小说，每一部都是人气爆棚，好好改编原著小说不好，非要整出《唐伯虎点秋香》这么一个幺蛾子…………ps：第二更送上，明天继续。