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I am working on Ubuntu OS.

Initially my pc configuration was Intel core 2 duo 3.0GH with 320 GB HDD. After some times, my friend changed the motherboard with lower version of configuration without changing the HDD.

Still the Ubuntu OS is working fine. I want to know that from where I would come to know the previous MAC (the machines physical address)? Does the system keep any log file in Hard disk ? If yes, then how to know?

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This information is unlikely kept. If it is kept it would be located in the same logs files as your current MAC address. Why do you care about our old MAC address anyways? –  Ramhound Mar 14 '12 at 17:28
    
Yes dear, I just want to know the MAC address of the old motherboard because I have to prove that I m innocent.. kindly help.. –  Mahfooz Mar 14 '12 at 17:46
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