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I want to connect an iMac G3 running Mac OS 8.6 to my Ethernet network. The easiest way for me to do this is to change the iMac's MAC address.

Is it possible to change the MAC address and, if so, how should I do it?

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    Why do you think that's the easiest way? Millions of machines with fixed MAC addresses connect to IP networks every day.
    – paxdiablo
    Commented May 10, 2022 at 4:45
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    1) That's almost assuredly not the easiest way. 2) You should be able to do this via OpenFirmware. To display the machine's MAC address you can use dev enet followed by .properties but I'm not totally sure how you'd go about setting it. Here's an OpenFirmware quick reference and a sample device tree to get you started (look for mac-address).
    – Alex Hajnal
    Commented May 10, 2022 at 4:52
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    @andypea - then one might say it isn’t your network and whoever controls the list might be unhappy.
    – Jon Custer
    Commented May 10, 2022 at 12:31
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    "My network has a MAC address whitelist that I don't control" means that you almost certainly should not be trying to do this. Talk to the people that do control your whitelist.
    – paxdiablo
    Commented May 11, 2022 at 4:09
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    @user253751 OP may not be on a traditional sort of privately-contracted ISP. For example, when I was a college student living on-campus, we were only allowed to submit 1 MAC address for the network at a time. In order to change that MAC address, we had to contact the ISP, and wait several hours if not a whole day. I learned about spoofing real quick back then.
    – Brian Reading
    Commented May 11, 2022 at 15:52

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There's a piece of abandonware called "Relocated" that was written by Robert Sixkiller & Adriaan Mol in the early 2000s. It will allow you to change (spoof) your MAC address in MacOS 8 and 9. You can find a copy here.

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