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Configuration Guide - Security

S9300, S9300E, and S9300X V200R011C10

This document describes the configurations of Security, including ACL, reflective ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, separating the management plane from the service plane, security risks.
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Configuring MAC Address Consistency Check in an ARP Packet

Configuring MAC Address Consistency Check in an ARP Packet

Context

The MAC address consistency check function for ARP packets prevents attacks from bogus ARP packets in which the source and destination MAC addresses are different from those in the Ethernet frame header. This function is usually configured on gateways.

This function enables the gateway to check the MAC address consistency in an ARP packet before ARP learning. If the source and destination MAC addresses in an ARP packet are different from those in the Ethernet frame header, the device discards the packet as an attack. If the source and destination MAC addresses in an ARP packet are the same as those in the Ethernet frame header, the device performs ARP learning.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. (Optional) On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

  4. Run arp validate { source-mac | destination-mac } *

    MAC address consistency check in an ARP packet is enabled. This function compares the source and destination MAC addresses in ARP packets with those in the Ethernet frame header.

    By default, MAC address consistency check in an ARP packet is disabled.

    NOTE:

    Sub-interfaces do not support the arp validate { source-mac | destination-mac }* command. When receiving ARP packets, a sub-interface checks MAC address consistency based on the rule configured on the primary interface.

    VLANIF interfaces do not support the arp validate { source-mac | destination-mac }* command. When receiving ARP packets, a VLANIF interface checks MAC address consistency based on the rule configured on the member interface.

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Updated: 2019-04-01

Document ID: EDOC1000178410

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