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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.年轻的网络设计师陶侃（陆毅扮演）在一次作品比赛中结识了柳翠芸（蒋虹扮演）。两人为一件作品产生争议，互不服输，成了“冤家”。陶侃与好友，香港青年何嘉林（陈浩民扮演）、杨慧敏（叶璇扮演）成立了青春网销公司，立志要在这一新兴行业中有所作为。不料，翠芸工作的欣欣房产公司与青春公司恰在同一幢办公大楼内，陶侃和翠芸，冤家路窄，两人一见面就相互嘲讽……大大小小的人物，继续装点着他们各自的人生……Let's look at another example of broadcasting. A program has 5 characters. After receiving the broadcasting message, it uses the stamp to draw the shape flower pattern.自从化名“美女蛇”的高级特务出任萍乡“剿共特别顾问”后敌保安局，警察局到处抓人、暗杀，致使我地下党组织遭到严重破坏。陈洪烈是红军侦察员，他的任务是为红军搞到急需药品。当地共青团组织为搞清陈洪烈的真实身份。沉着的陈洪烈看出了他们的破绽机智地同他们对上了暗号。陈洪烈利用何通为父送殡之机将药品放在棺材的夹层里。药品由黄开泰运送上山，但陈洪烈等人却落入敌人之手，在地下党的设计诱出了“美女蛇”，原来他就是卖药人胡宝堂。7-bark Cortex