LAN ARP Spoofing defense solution

There are many crises hidden in the vast borderless world 路 World 裡, but due to the advancement of security equipment technology, most external attacks have been effectively blocked, but only for attacks in the local area network (Local Area Network) Barrier defense, this type of equipment is relatively weak.

Address Resolution Protocol (Address Resolution Protocol) is mainly designed to obtain the second layer address (MAC address) from the OSI model third layer address (IP address), ARP packets will only be transmitted in the same subnet 路 (subnet), It is rarely transmitted to the same network through the router. The host's operating system will perform a calculation based on the IP address of the packet destination and the value of the subnet mask of the local machine to determine whether the IP of the packet destination belongs to the same subnet as the local machine Address Resolution Protocol (Address Resolution Protocol) is a very important and frequently used protocol. Before any TCP / IP connection is established, 都 must obtain the physical network address of the destination host via the Address Resolution Protocol (Address Resolution Protocol). (MAC), in the local area network (Local area network), this is also one of the most important protocols in the bottom layer of network communication.

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