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In fact, iptables is not a real firewall. We can understand it as a client agent. Users execute the user's security settings into the corresponding "security framework" through iptables. This "security framework" is the real firewall. The name of this framework is netfilter.众护卫忙拦住，并赔笑劝止。马老九闻言谦道：军师、船主妙计，在下不过匹夫之言。初一日，一声炸雷宣布藏冬的万物苏醒了，田间地头山川河流……四野的小草野菜都窜出新绿，柳树吐出了细嫩的芽头，人们脱去厚厚的棉衣，轻装扑向春天。A. Congenital or acquired abnormalities;Three days before the launch ceremony, on December 29, 2018, General Secretary Xi Jinping said at the New Year's Tea Party held in the auditorium of the National Committee of the Chinese People's Political Consultative Conference, "We should advocate learning and strengthen learning". The words sound just fell and "learning power" went online.As a person who knew crayfish very well from an early age, I also lost money because I was too confident and thought I was smarter than others. Therefore, novices must be careful when entering. They should not think it is easy to raise crayfish and think it is easy to earn money.