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We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.小葱忙又问了一遍。Using proxy mode, the function can be divided more clearly, which is helpful for later maintenance!The MDT meeting agenda shall be communicated with and confirmed by MDT members prior to the meeting.唐肃宗年间，因宫廷争斗，太子流落民间并改姓薛，名平贵。汪魁笑道：既这么说，我就往左，胡钧往右，黎兄弟你在中间，彼此间相隔两箭之地。该剧讲述死守犯罪现场的黄金时间的112中心的成员们和撼动韩国的极其凶恶的网络犯罪中被称为“Dr. Fabre”的Dark Web背后的巨大的犯罪大鳄对抗的故事，是成员们和犯罪的第三次记录。