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Log Reference

CloudEngine 8800, 7800, 6800, and 5800 V200R005C00

This document provides the explanations, causes, and recommended actions of logs on the product.
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ARP/4/ARP_DUPLICATE_IPADDR

ARP/4/ARP_DUPLICATE_IPADDR

Message

ARP/4/ARP_DUPLICATE_IPADDR: Received an ARP packet with a duplicate IP address from the interface. (InterfaceName=[InterfaceName], IpAddress=[IpAddress], MacAddress=[MacAddress], PE-VLAN=[PeVLAN], CE-VLAN=[CeVLAN])

Description

An interface received an ARP packets carrying an IP address the same as an existing one.

Parameters

Parameter Name Parameter Meaning
IpAddress IP address that is conflicted with the existing one
InterfaceName Name of an interface
MacAddress MAC address
PE-VLAN Outer VLAN
CE-VLAN Inner VLAN

Possible Causes

  • Cause 1: Another device on the network is configured with the same IP address as the local device.
  • Cause 2: There are ARP spoofing attacks with bogus source IP addresses.

Procedure

  • Cause 1: Another device on the network is configured with the same IP address as the local device.

    Check the devices with the same IP address on the network according to the conflicting VLAN, interface, and IP address in the log. Modify the interface IP address according to the address planning to remove the address conflict.

  • Cause 2: There are ARP spoofing attacks with bogus source IP addresses.

    Find the attack source according to the conflicting VLAN, interface, and IP address in the log, and configure the device to prevents ARP spoofing attacks. In addition, you are advised to remove virus from the PC or server in the attacked network.

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Updated: 2019-04-20

Document ID: EDOC1100039602

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