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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.爱奇艺自制古装网剧《公子倾城》概念海报释出！古灵精怪的江湖侠女遇上孤傲绝尘的无感庄主，阴差阳错下感知互换。奇妙姻缘“甜”注定，反转爆笑乐不停。改编自维和粽子同名小说，敬请期待！只看了几张纸，我就头皮发麻，不过我还是忍着反胃和恶心，把全文看完了。　　美高梅的無劇本與另類電視台和Orion電視台總裁，巴里楫i茲尼克（Barry Poznick），本片在2011年圣丹斯电影节上获得剧情片评委会大奖，女主角也赢得评委团特别奖。武馆女掌门黄小鱼作误闯娱乐圈，意外成为当红明星袁帆的贴身保镖，正式开始甜喜过招的同居生活。黄小鱼也向袁帆坦白了自己被大热武侠游戏《新斗罗大陆》NPC附身的秘密，开启了一段游戏和现实双线开恋的高甜时光。