Event ID - PIX-4-405001

Message CodePIX-4-405001
SeverityWarning
DescriptionReceived ARP {request | response} collision from IP_address/MAC_address on interface interface_name.
ExplanationThe Cisco ASA received an ARP packet, and the MAC address in the packet differs from the ARP cache entry.
User ActionThis traffic might be legitimate, or it might indicate that an ARP poisoning attack is in progress. Check the source MAC address to determine where the packets are coming from and check to see if it belongs to a valid host.
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