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If the command in the above example does not use-s to specify the original source address in the corresponding rule, After the modification is completed, The source address in the rule you modify will automatically change to 0.0. 0.0/0 (this IP represents an IP address that matches all network segments), At this time, the corresponding action of-j is REJECT, Therefore, if the original source address of the rule is not specified when executing the above command, all IP requests will be rejected (because the original source address is not specified, the source address of the current rule will automatically change to 0.0. 0.0/0). If you are using ssh to remotely go to the server for iptables setting, your ssh request will also be blocked.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.剩下他爷俩，我是哪个都舍不得。"What, T-shirt, skirt and bag are just the same, miss, please wrap them up."Power Up -- Red Velvet“杨光”的身份依旧还是保安，但感情上却百般周折，与众多女演员发生各种啼笑皆非的纠葛，走了一个又来一个，反反复复，用他自己的话说是“感情大丰收”，特别是这回还给“杨光”与其中一位女友设计了吻戏，成为该剧一大看点。了许多，大有夺“杨光”的风头之势，坏的是平时不务正业混日子的“条子”走上了一条不归路，饱受身心煎熬，尝尽了苦头。 　　“杨光”的父亲“杨丰年”还是那个在家里闲来无事的老头，韩兆笑称老爷子没什么正经戏，净干些“拈花惹草”的事，杨少华说自己其实就是个活动背景，一辈子没受过骗的杨老爷子这回算是领教了骗子的高超骗术，把全部家当拱手相让，最终还是“杨光”这个大孝子替父亲要回了钱。大家是否还记得在《杨光3》的《捉贼记》一集中被人误认为偷车贼的“老七”，他的命运在《杨光4》中来了个大转折，不但找到了漂亮温柔的女朋友，而且还非常有钱，两人住在豪华别墅甜蜜的生活。Impeachment of the queen, asking the emperor to scrap the passbook like snowflakes, flew to the cabinet, the emperor...