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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.五百门……不……至少有七百门……德布拉甘萨颤抖地望向沙加路吼道，为什么？沙加路早已躲到甲板的角落跪地抱头，生怕被什么东西误伤。黄瓜气得无语，只好丢开。遥想当年，太祖一马平川把蒙古人赶走，永乐更进一步迁都北京，屡进北漠将蒙古人驱逐，可后来的子孙们越来越不争气，到嘉靖这辈基本已经不是能不能争到气的问题了，他是根本不争。西南边陲，贩毒活动猖獗，毒枭阮霞、萧金、托姆等头目只手遮天，为了打通三棵树经昆明到香港的通道，并盗取生物学家陈百涛教授的最新技术资料，阮霞、萧金、托姆派遣李新潜回大陆，李新回境后，假意与陈教授之女陈思思发生关系，在潜入陈教授书房被发现后，再次安排同伙榴红以保姆身份进入陈教授家中。而李新在窃取资料后，意想不到招来除警方压力的黑帮连环追杀…… 以刑警队长高一朗为首，警员杨辉、傣族战士岩松、训犬主…绿叶直起腰。