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CLI-based Configuration Guide - Security

AR500, AR510, AR531, AR550, AR1500, and AR2500 V200R010

This document provides the basic concepts, configuration procedures, and configuration examples in different application scenarios of the network management feature supported by the device.
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ARP Packet Validity Check

ARP Packet Validity Check

After receiving an ARP packet, the device checks validity of the ARP packet, including:
  • Packet length
  • Validity of the source and destination MAC addresses in the ARP packet
  • ARP Request type and ARP Reply type
  • MAC address length
  • IP address length
  • Whether the ARP packet is an Ethernet frame
The preceding check items are used to determine whether an ARP packet is valid. The packet with different source MAC addresses in the ARP packet and Ethernet frame header is possibly an attack packet although it is allowed by the ARP protocol.

After ARP packet validity check is enabled on the gateway or an access device, the device checks the source MAC addresses in the ARP packet and Ethernet frame header, and discards the packets with inconsistent source MAC addresses.

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Updated: 2019-05-20

Document ID: EDOC1100034236

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