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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.CBS宣布开发英剧《鬼屋欢乐送 Ghosts》的美版，Lionsgate及BBC Studios合作制片﹑由Joe Port及Joe Wiseman负责。《鬼屋欢乐送》讲述一对年轻夫妇搬到梦想的乡间别墅后，发现这儿原来有着一群不同时期的鬼魂，而他们都想把主角二人赶出去。荣郡王世子夫人吓呆了，在胡敦提醒下，才和妹妹上前扶住满脸是血的二太太，低声提醒她不可再莽撞。她的心中一定藏有很多秘密。营地边两人正在私语话别。营帐里，项羽、尹旭、项庄、龙且、虞子期、英布、钟离昧、季布等人围坐一起，他们都是项羽一系，或者说主战派的核心人物，谈及什么，也不虞担心走漏消息。《有问必达》是天津卫视的一档新节目，英达将首次涉猎职场话题。访谈中，英达扮演的刺儿头员工会向老板们频频抛出难题，比如长期请病假、不服裁员、对老板言语威胁等，跟观众分享更多的职场实例，告诉大家如何在职场中保护自我权益。