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Duplicate MAC Addresses

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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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.

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Duplicate MAC Addresses

by jack_j_guarnera In reply to Duplicate MAC Addresses

The question was auto-closed by TechRepublic

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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.

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Duplicate MAC Addresses

by jack_j_guarnera In reply to Duplicate MAC Addresses

The question was auto-closed by TechRepublic

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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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