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Is it because the MAC address of the VM changes?

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Even if the MAC address stays the same, the location may change, and the VM might be connected to a different switch; the system needs to make traffic go to the new location instead of disappearing at the old one.

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That makes sense. Does the MAC address remain the same or does it change? –  Bruce Dec 18 '11 at 20:43
    
It should remain the same -- when you're migrating a live VM, its hardware is supposed to stay the same. Changing the address from outside would introduce unnecessary complications. –  grawity Dec 18 '11 at 20:55

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