FreeKB - Resolve Duplicate IP address
Wireshark - Resolve Duplicate IP address

Warning Duplicate IP address configured in the Export Information windows means there are two or more workstations in the network configured to use the same IP address. In this example, the IP address in question is The resolution to this issue is to configure the workstations to use DHCP so that they do not obtain a duplicate IP address, or to reconfigure the workstations to use different static IP address.

In the scenario where you verify there are not two or more workstations in the network using the same IP address, this may suggest that your network has been ARP poisoned. 

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