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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.When using flexible connection traction device, the distance between the two cars is more than 4 meters and less than 10 meters.6. Channel change signal: the right arm extends horizontally forward, the palm is left, and the right arm swings horizontally to the left;诗以树为意象，一花一叶都充盈着爱意。才上线不到一个月，Netflix就续订《#黑钱胜地# Ozark》10集的第二季。《黑钱胜地》讲述主角Marty在受到死亡威胁下，向毒贩集团表示自己可以在奥沙克湖那边进行洗钱活动，获批准后举家搬到那度假胜地去。If the user checks "Show Year in Task Information Date", the displayed date will include the year, otherwise it will not.