(By blocking false ARP packets at the system kernel layer and automatically notifying the gateway's accurate MAC address, the ARP firewall can ensure that the data flow is accurate and does not pass through a third party. Then ensure the security of the communication data, ensure that the network is unblocked, and ensure that the communication data is not controlled by a third party. Including blocking ARP attack, blocking IP conflict, Dos attack suppression, ARP data analysis and other functions.)