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Press the F key to increase the flap adjustment. This will slow down the plane.“赢了的话就向前辈告白！”但是实力远远不及。The situation in centos7 is slightly different from that in centos6. Let's first talk about how to save iptables rules in centos6.SNAT: Source address translation solves the problem that intranet users use the same public network address to access the Internet.生活在小城市的一对年轻夫妻杨华和苗唯最近过得不顺心，两人本是相爱却因矛盾不断升级而怨恨纠缠。海市蜃楼般的奇异幻象照进现实，一场风暴袭来，麻木中的万事万物迎来再一次的觉醒。(3) Instruments, equipment and facilities suitable for the maintenance and testing business scope of fire fighting facilities;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.