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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.For the operation and maintenance phase, BIM technology can be used to realize virtual reality, asset statistics, space management, building system analysis and disaster emergency simulation. BIM model can improve the efficiency of operation and maintenance, reduce costs, improve the service life of subway and avoid operation and maintenance risks.Analysis: If the two references are the same object, function and array, they are equal. If the references are not the same object, function and array, they are different, even if the two objects, functions and arrays can be converted into exactly equal original values.This is what we often call the professional model.牡丹——在出生的那一夜被绑架的姐姐真世，玫瑰——从不知道姐姐的存在，衔着金汤匙出生的妹妹香世。System Status of Production Order