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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.可是，妹妹以后可以跟她和板栗一块去京城啊，若是眼下独自前去，她怎么能放心？香儿眼珠一转，甜甜地笑道：我跟着鲁三叔他们，去过许多地方呢，林大哥不用替我担心的。少年见她说话间就把自己给放了，一时间反应不过来，不知是呵斥还是感谢才好。这年秋天，从未想过会一个人生活的方佳莹(孙可芳饰)和交往三年的男友杨大和(林子閎饰)分手了。佳莹藉工作麻痺自己，在一场以出差為名的疗伤之旅中，她邂逅了一枚在她认知裡的头号怪胎──丁志明(宋柏纬饰)。　　转眼过了数年，星际探险员赛小息、天才机械师卡璐璐和宇宙战士阿铁打奉命维修飞船，却被遥远星系突如其来的神秘爆炸震散，流落四方生死未卜……赛尔先锋精英小队星际探险的航程难道就要在此终止了吗……What will China develop into after two more 15 years of struggle? The 19th National Congress of the Communist Party of China also gave a very specific description.