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61. X.X.201We 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.黄飞鸿是清末民初名震岭南的着名拳师，平素以行侠仗义、排解纠纷为己任；除了设馆授徒之外，并医治跌打济世，在武林中极有声望。某天正值黄飞鸿宝芝林药局新张吉庆，德记栏主人周立德前来道贺，并希望黄飞鸿能够帮助他在来年观音诞时抢得丁财炮…女子带着一批不为人知的杰作走进一家纽约画廊，由此开始了一个关于艺术圈的贪婪与恣意，以及一场惊天骗局的故事。But in that case, Not even considering so many dangers, This performance of '74 spray' is of great use, I remember there were 4 '74 spray' on the position at that time, There are two recruits who operate them. Two veterans, Both veterans were squad leaders, All have the skills of air injection, Facing the big wasp descending from the pavement, The two of them were obviously forced to hurry, Take up the '74 spray' and aim at the position where the big wasp is relatively concentrated in the sky and spray it out. If it weren't for the critical situation at that time, the two squad leaders would definitely not have this kind of "dangerous operation", while the other two recruits watched the veterans take the lead and learned to do so. Although they had not received relevant training and the accuracy of spraying was not as good as that of veterans, they finally sprayed out and did not hurt themselves or other comrades in arms.咱们家想不兴旺都不成啊，瞧这些小东西，这么用心上进。