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Article 12 Sailing Boats如果硬要选出第三个超级大国，那么必然是陈启的文娱帝国。In popular terms, it is to use network node resources such as IDC server, personal PC, mobile phone, smart device, printer, camera, etc. to launch a large number of attack requests on the target, which leads to waste of network resources, congestion of link bandwidth, depletion of server resources and interruption of service, making it impossible to provide normal services to the outside world, and only game over can be announced. The detailed description is shown in the following figure:只杀敌，不表演。So at the moment, We're on another machine, Use the ping command to send a message to the current machine. As shown in the following figure, the ping command can be responded to, proving that the message sent by the ping command has been normally sent to the host where the firewall is located. The IP address of the machine where the ping command is located is 146, and the IP address of the host currently testing the firewall is 156. We will use this environment to demonstrate the operation of iptables.时隔千年，虽然越人和后世的狼兵有所差别，却也有异曲同工之妙。