(The ARP attack and protection methods and the ARP attack principle are described in detail. It is very good to find on the Internet. Because there are many contents, the outline is as follows: 1. ARP concept 1.1 ARP concept knowledge 1.2 ARP working principle: 1.3 ARP communication mode 2. Common ARP attack types 2.1 ARP scanning ( ARP request storm) 2.2 ARP spoofing 3. Common protection methods 3.1 Static binding 3.2 Use ARP protection software 3.3 Routers with ARP protection function)