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As shown in the above figure, when ping 156 host, the PING command has not been responded to. It seems that our iptables rule has come into effect. The message sent by ping has not been accepted by 156 host at all, but has been discarded, so let alone any response. Well, we have successfully configured an iptables rule. It seems that we have already started.The server's valid reply to the PING command can be one of the following three replies:History宣布直接预订10集UFO题材剧《蓝皮书 Blue Book》，该剧由David O’Leary执笔，根据现实美国空军的研究计划所改篇，背景50-60年代。在当时美国兴起一股UFO的热潮，美国空军为调查UFO而成立了蓝皮书计划/Project Blue Book来作相关研究。剧集讲述一个聪明的大学教授J. Allen Hynek被空军招揽，并由他处理蓝皮书计划中多达数千的未解案件，每一集皆会引用真实的案件，把UFO事件与美国那段具神秘感的历史结合起来。《十八罗汉》是李小龙执导的三十三集电视连续剧，由焦恩俊、何润东等领衔主演，讲述了唐朝末年，皇室势微，九皇子李如璧被迫逃亡，在西天十八罗汉的神助下荡平藩镇割据势力、夺回皇权的故事。他想着，这山谷中一池清水，少了荷叶荷花，岂不少了许多趣味。至此，反秦首战以一场完美的伏击告捷。