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By default, the changes we make to the "firewall" are "temporary". In other words, when the iptables service is restarted or the server is restarted, the rules we normally add or the changes we make to the rules will disappear. In order to prevent this from happening, we need to "save" the rules.龙且愤然离去确实不争的事实，亲兵迅速将这个消息禀报上去。In this practice, what makes me feel very much is the aspect of interpersonal communication. Everyone knows that interpersonal communication in society is very complicated, but I think it is hard to say clearly how complicated it is. Only through experience can we understand it. Only in this way can we have a deep feeling. The following is the research report on the social practice activities of college students in the countryside compiled by YJBYS. Read it!RB1, …林聪看着胡钧，神情若有所思。范增有些郁闷，若是换了别人自己可以主动毫不留情的阻止，甚至是呵斥。