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But this is not over yet. Ethernet also requires CRC verification when transmitting data. The network card will CRC check the data packet before sending the data, attaching a 4-byte CRC value to the back of the packet header. At this time, the packet length is no longer 40 bytes, but 64 bytes, which is often referred to as SYN packet attack. The packet structure is as follows:红椒忙道：我可不就是这么说的。不急，所有货都不急，有一分是一分。“人类爱上吸血鬼！”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.震惊！懵懂少年在祖坟偶遇修仙大姐姐，身上的怪病竟然奇迹般消失了，还正式踏上了修仙之路。嗯？……30天内必须要结成道侣，否则就会死？Step 4: Release the startup key/power key, and the HOME key will not be put on for 15 seconds. This step can enter DFU. At this time, the mobile phone is black screen, but iTunes can recognize it.