How to find a changing IP on ethernet network

[Ivan Andres Hernandez Puga <ivan.hernandez () globalsis com ar>]

Hello. I have a client with a simple Ethernet network with HUB's 
connecting and there is one person that is changing it's IP and creating 
conflicts. What would you do to track down that person? i mean, to find 
who does that?
Thanks!
Ivan Hernandez


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