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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.尹旭心中一暖，再拜出门去了。所谓‘天然去雕饰，比簪金戴玉来得好。聪明。这一次，她只带了五个军士，一路马不停蹄，于四月八日重新赶到清南村。Why can poor Han Xin endure the humiliation of his crotch? Because he has a firm ideal of life. As Su Shi said: "When a common man sees humiliation, he draws his sword and stands up to fight. This is not courage. There are great brave people in the world. They are not surprised when they come, and they are not angry when they add it for no reason. The people they hold are very large and their ambition is far away."公元2035年，是人和机器人和谐相处的社会，智能机器人作为最好的生产工具和人类伙伴，逐渐深入人类生活的各个领域，而由于机器人“三大法则”的限制，人类对机器人充满信任，很多机器人甚至已经成为家庭成员。