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  • #2115016

    Duplicate MAC Addresses

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    by jack_j_guarnera ·

    I have some Compaq Deskpro EN’s with PII/400 or PIII/500 processors and Compaq/Intel Pro 100 PCI NIC’s. Recently, some PC’s where restored to the original, factory image. The factory image used a Compag/Pro 100 NIC driver. All PC’s with the restoredimage reported to have the same MAC address. To make matters even more interesting, the vendor prefix of this address has not been released by the IEEE.
    If I replace the Compaq driver with a current Intel driver, the correct, individual MAC’s are initialized and the problem is solved.
    I must assume that the erroneous MAC address is used in manufacturing but I haven’t been able to find any references to this problem anywhere. Can anyone shed some light on this?

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    • #3686429

      Duplicate MAC Addresses

      by wburdine ·

      In reply to Duplicate MAC Addresses

      If you go to the advanced tab under the NIC’s property page (assuming your using Win 2k, NT, or 9x) you will find a setting for over riding the NIC’s MAC address. Here it is common for (paranoid or power crazed) people to enter custom MAC’s for their own network to work only with a switch or router that will have lock outs to anything other than the custom MAC addressing scheme.

    • #3801060

      Duplicate MAC Addresses

      by timtoombs ·

      In reply to Duplicate MAC Addresses

      i agree with burdine. clear the custom mac address field checkbox and the address from the nvram will be used instead.

    • #3723022

      Duplicate MAC Addresses

      by jack_j_guarnera ·

      In reply to Duplicate MAC Addresses

      This question was auto closed due to inactivity

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