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What is the format of MAC addresses?

Discussion in 'Tomato Firmware' started by Kiwi8, Nov 24, 2008.

  1. Kiwi8

    Kiwi8 LI Guru Member

    Hi all.

    What is the format of the MAC addresses?

    I think I tried the format of 11:11:11:11:11:11 but it seemed to be an invalid one. Then I modified it to 00:11:11:11:11:11 and it works.
     
  2. fyellin

    fyellin LI Guru Member

    The first six hex digits of a MAC address are the OUI ("Organizationally Unique Identifier"). They identify the manufacturer or vendor of the ethernet address. OUIs are purchased from IEEE for large sums of $$$. The last six digits of the MAC belong to the vendor, and the vendor can use them in any way it wants.

    Traditionally, the first two hex digits of MAC addresses have always been 00. Digits other than 00 seem (IMHO) to be reserved for esoteric non-ethernet uses, though this is probably changing.

    You can find the complete list of assigned OUIs here. If you click on the MAC address on Tomato's device page, it will show tell you the vendor of that specific MAC.
     
  3. Kiwi8

    Kiwi8 LI Guru Member

    Yeah I understand that MAC addresses were meant to be unique and are assigned by IEEE. But well, I just wish to modify the MAC addresses (via spoofing) on the Tomato routers that I'm using so that it is easy to remember the MAC addresses instead of using the default MAC addresses. :)
     
  4. fyellin

    fyellin LI Guru Member

    If you click the "random" button on the Tomato MAC page, it'll give you 00 followed by 14 random hex digits. You're probably safe doing the same.
     
  5. Kiwi8

    Kiwi8 LI Guru Member

    Hokays... thank u for your insightful advice. :)
     

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