How to prevent ARP attacks targeted at static users

Static users (for example, dumb terminals such as printers and servers) are allocated static IP addresses. Attackers usually steal authorized users' IP addresses to connect to networks and initiate ARP attacks to interrupt network communication.

To defend against ARP attacks, a static user binding table and dynamic ARP inspection (DAI) can be configured for static users. DAI checks ARP packets based on binding entries.

Run the user-bind static command to configure the static user binding table, and run the arp anti-attack check user-bind enable command to enable DAI.

After the configuration, when a device receives an ARP packet, it compares the source IP address, source MAC address, interface number, and VLAN ID of the ARP packet with static binding entries. If the ARP packet matches a binding entry, the device considers the ARP packet valid and allows the packet to pass through. If the ARP packet does not match a binding entry, the device considers the ARP packet invalid and discards the packet.

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