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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.警界的秘密武器，在林立的高楼间低飞穿梭，火力足以轰掉半个城市。一群警界败类，企图利用它作不法勾当，驾驶法兰克因知情而被诬陷追杀，他决定突破重围，扫荡罪犯。这里，众人又忙碌了好一阵，冬日天短，又是下雪天，渐渐天光就暗了，郑氏也醒了过来。但没办法，我有自己的路，自己选的路，四书五经有其价值，但那从不是自己的价值。Telecommunications方志敏率领红十军团直插国民党腹地。谭家桥一战，由于军团长刘畴西刚愎自用，战况急转直下，方志敏等将领在怀玉山先后被俘。在狱中，方志敏等人和敌人坚决斗争。刘畴西更是对所犯错误悔恨不已，造成红十军团全军覆没。劝降无济于事，蒋介石下令枪毙方志敏。你们只能砍下我的头，绝不会动摇我的信仰。信仰者们被带上刑场……最后，我知道很多人不信，认为我在过度解读，那我就再补充几个细节。