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不比你们，都是近年的进士，记忆要新鲜许多。周青十分好奇。当下众人又仔细议定各项事。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.The fourth: singleInstanceThe name of the personnel on duty, the number of inspections per day, the inspection time and the inspection position.两名德国计算机先驱在与一名显然不可战胜的对手的战斗中出庭，以被承认为谷歌地球算法的发明者。这部系列片既展示了90年代柏林重新统一后的黑客场景，也展示了早期硅谷的理想世界和数百万美元进程的严酷现实。