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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: How do I get my Pi4 (Fedora) to use a real and stable MAC
 address?
Date: Tue, 17 Sep 2024 10:44:35 +0100
Organization: A little, after lunch
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On 16/09/2024 23:30, Lars Poulsen wrote:
> On 9/15/2024 9:36 PM, The Natural Philosopher wrote:
>> Unfortunately you are probably the only one here that is using RedHat 
>> on a Pi.
> 
> You may well be right about that.
> 
>> AFAIK, ethernet defaults to 'one permanent MAC address' - its only 
>> wifi that tends to switch around for security in public wifi spaces.
>>
>> Have you actually checked to see if you are getting ethernet 
>> randomisation?
>> ifconfig -a will display it
> 
> Thank you for an actually useful suggestion. I had forgotten to check 
> that and just assumed that was the cause of a change in IP address.
> 
> 
> 
Hang on a minute.... IP address or MAC address?

IP address may change any time you connect to the DHCP server (if you 
are using DHCP).

ifconfig -a
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        *inet 192.168.0.101*  netmask 255.255.255.0  broadcast 192.168.0.255
         inet6 fe80::9a2:3187:4600:cfc1  prefixlen 64  scopeid 0x20<link>
        *ether d8:3a:dd:85:22:b1*  txqueuelen 1000  (Ethernet)
         RX packets 335547  bytes 39007037 (37.2 MiB)
         RX errors 0  dropped 158  overruns 0  frame 0
         TX packets 348598  bytes 256465720 (244.5 MiB)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

This is a statically configured *IP address* on a Pi 4B
I assume the Ethernet *MAC* address is always the same.

Looking up the MAC address online:
Result:
MAC Address Prefix	Manufacturer
D83ADD				Raspberry Pi Trading Ltd

-- 
The lifetime of any political organisation is about three years before 
its been subverted by the people it tried to warn you about.

Anon.