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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.有可能，但我们只要围住山路，盗匪只能困于其中。说什么都显虚伪，都可笑。《如果月亮有眼睛》是2006年北京激动影业有限公司出品的一部爱情剧，改编自张小娴的作品《那年的梦想》，由杨超执导，吴毅敏编剧，瞿颖、胡兵、耿乐、杨恭如、蒋勤勤主演[1] 。