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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.3. Return-MASTERDOWN error.死者：夺命书生身份：《兵器谱》排名第二，宁王府客卿死因：被没有枪头的霸王枪刺死死亡地点：京都华太师府杀人者：唐伯虎至此，《兵器谱》上再也没有夺命书生剑五字，唐家霸王枪重新夺回排名。第一集的故事发生于Wilson的女友去世八周 以后。很明显，在这种打击下，他已经了无生趣了，不管医院工作多忙，或者House怎么刺激他，他都完全提不起精神来。面对这样一个活死人，当House遇到麻烦，或者需要与人分享各种好主意或馊主意时，他该投向谁的怀抱呢？好在这个难题在第二集就有了答案——某个尖酸刻薄的私家侦探的出现，使House有了臭味相投的拍档。此人由Michael Weston倾情出演，其 狡猾邪魅的程度，据说几乎不输于House本人。提起大哥，赵锋没了声音——这辈子他都比不上哥哥了。We can see above that the basic process of Baidu's interview is like the above code, so Ali and Tencent's are also similar to the above code (here we don't stick the same code one by one), so we can extract the public code. Let's first define a class called Interview方家兄弟这才齐齐松了口气，对着小葱不住说感谢的话，又说害她费心。