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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.Today's social environmental problems are becoming more and more serious, and the awareness of environmental protection is gradually fading in people's minds. In addition to the destruction of our actual actions, the environmental problems of the whole earth cannot be ignored. If we love our earth and our home, let us give a little strength to smile. Therefore, we designed this activity...............太平洋は燃えているか？ 川岡大次郎 大高洋夫Fifteen pupils and their teachers embark on an extraordinary time-travelling adventure as they fast-forward through more than 100 years of school life.Illustration of Event Delivery MechanismPurple: Lithospermum, Black Bean, Mulberry