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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.也不许他扰乱公堂，因此再次恐吓道：再敢喧哗，拖下去重责十大板。半响。三十年代的中国风雨飘摇，内忧外患接踵而至，面对东北三省被日本强行霸占，全面侵华战争爆发在即，抗日救国运动风潮席卷全国。群雄鼎立的上海滩，更是兵家必争之地，而拥有船只和码头的上海船王张家更成为各方争取的焦点。1937年春，张家大老爷张锦臣擅自为独子张子卿订下亲事，迎娶上海滩青帮老大袁九爷之女袁静如，婚事轰动整个上海滩。更糟的是，身为新郎的子卿竟也不知所踪。原来子卿热身抗日活动，偶遇从西塘初到上海的李汉昌，两人相貌惊人的相像。不愿受家族约束的子卿，为了能全身投入抗日活动，请汉昌冒充自己进入张家应付家业。此时，假借行医为名的日本特务村上，一方面利用各方势力从外部压制张家，另一方面用尽手段从内部分离张家，使张家连生突变，分崩离析。而子卿、汉昌以及静如三人间的情感纠葛牵动出他们的身世之谜，更引得张家隐藏多年的家族秘密被迫浮出水面。直至子卿牺牲，令汉昌和静如顿然醒悟，他们以自己的行动，信守对子卿的承诺，维护张家人的尊严，维护中国人的尊严。How to improve the classification ability? Apart from practicing and thinking more, I think the core is two points: