MAC address changed

Michael Ross gmx at
Tue Apr 8 01:32:24 UTC 2014

On Tue, 08 Apr 2014 02:18:32 +0200, Mike Jeays <mike.jeays at>  

> More hardware related than FreeBSD - I have an old Pentium 4 with
> a Realtek network card, that I use for backups. I had a power failure
> yesterday, and on reboot, the MAC address on the card has changed from
> 00:e0:18:94:55:89
> to
> 00:e0:18:94:e0:89
> Anyone have an explanation for this surprising behaviour?

RealTek has produced really bad cards for a while,
you may have one of those ( especially if it is from the Pentium 4 days ). ( from 2001 )
"For example RealTeks tend to change their MAC-Address wihtout motivation."

I've never noticed MAC changes, but I've had bad performance problems
with 8139 cards -- maxing out at ~70MBit.
Best to use another one, really.


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