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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.不出两三年变得满目疮痍，乌烟瘴气。在奥斯陆Hartvig Nissens上高中的一群年轻人的青春故事，每一季变换一个主角。又不住责备方智兄弟两个，说事先为何没让人将马场清理干净。　　在「50」重案组的帮助下，McGarrett发誓要了结父亲遇害的案子，让父亲得到安息。与此同时，他也将带领自己的战友扫清这座美丽岛屿上的一切邪恶，让夏威夷－－美国的第「50」个州－－永远是人间天堂。克里斯·帕拉特将回归电视，出演新剧《终极名单》(The Terminal List，暂译)。剧集由安东尼·福奎阿执导，根据Jack Carr畅销小说改编，David DiGilio(《旅行者》)撰写剧本。这部惊悚剧讲述了海豹突击队全队在一次高风险的秘密任务中遭到伏击的故事。里斯(帕拉特饰)带着对那件任务的矛盾记忆，以及对自己过失的疑问回到了家。然而，随着新的证据浮出水面，里斯发现了对他不利的黑暗势力。刘邦和张良这才长出一口气，欢天喜地地送走了项伯，却没xiangdao又迎来了第二位意想不到的客人……#c show_style();。