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    Of course it is. Have you missed the "Reinitialize the MAC address of all network cards" checkbox in VBox GUI when cloning?
    – Marek Rost
    Commented Mar 17, 2017 at 17:55
  • @MarekRost: Yes I have seen that "Reinitialize..." things. Does that guarantee that the MAC address is unique for all the virtual servers that are in Virtualbox? Does that reinitialize the one which are created now or earlier as well? Commented Mar 17, 2017 at 18:03
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    it will generate new random MAC for the newly created machine - so there is reasonable chance it will be unique. Alternatively you can set MAC manually from machine settings -> network -> adapter -> advanced. Obviously it won't work from inside the machine unless you change it with every boot.
    – Marek Rost
    Commented Mar 17, 2017 at 18:07