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CLI-based Configuration Guide - Security

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 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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Gratuitous ARP Packet Sending

Gratuitous ARP Packet Sending

As shown in Figure 11-6, an attacker forges the gateway address to send a bogus ARP packet to UserA. UserA then records an incorrect ARP entry for the gateway. As a result, the gateway cannot receive packets from UserA.

Figure 11-6  Bogus gateway attack

To avoid the preceding problem, configure gratuitous ARP packet sending on the gateway. Then the gateway sends gratuitous ARP packets at intervals to update the ARP entries of authorized users so that the ARP entries contain the correct MAC address of the gateway.

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Updated: 2019-08-07

Document ID: EDOC1100034077

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