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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.此战虽然有些艰苦，但何尝尝又不是个机会呢。索尼娅追随爱情也来到了中国，但是李天杨认为自己窘迫的处境已经不太适合继续和索尼娅的爱情，忍痛拒绝了索尼娅。索尼娅在了解到李天杨的遭遇之后，暗中用自己劳动获得的报酬资助李天扬父亲支付了高额的医药费用。但她认为李天杨没有把自己视为生死相随的伴侣，于失望中离开了中国。待众人安静了，她才又问道：既然这样，那个，那怎么……还没开刀？卫江闻言，猛然抬头，死死地盯着她，怒道：黎章，你这混蛋，巴不得老子早死？一个军汉忍不住踢了他一脚，骂道：早死晚死，横竖都要死，你挨就能挨过去了？转头对小葱赔笑低声道：黎火长，这家伙有些来头，何副将军不敢就杀他。张槐听见要刨祖坟，终于变色。可是少爷想必也晓得，香儿在王家过得啥日子，那死狗子两口子都不拿她当人哩。林聪打量了他两眼，淡淡说道：富贵。