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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