[CentOS] the wandering MAC?

Eero Volotinen eero.volotinen at iki.fi
Wed Oct 13 14:55:06 EDT 2010


2010/10/13 Boris Epstein <borepstein at gmail.com>:
> On Wed, Oct 13, 2010 at 2:19 PM, Brunner, Brian T.
> <BBrunner at gai-tronics.com> wrote:
>>
>>> I just tried a full powerdown with NTP deactivated. The
>>> system came up, the time is fine.
>>>
>>> Not that the time on the motherboard should necessarily
>>> affect the MAC on an expansion card, but that was a good test
>>> nonetheless.
>>
>> I'm suspicious (as others have suggested) the card itself is bad.  I
>> think to suspect the flash chip that stores the MAC addr.  The rest of
>> the card may be perfect.  Using it long-term might require no more than
>> a manual edit of the init script for it adding something to this effect
>> 'if MAC == zeros; then set MAC to 00:0a:cd:1a:c1:71 fi'.  This will fix
>> this card without clobbering it's successor down the road.
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>
> Brian,
>
> While those suspicions were well justified I am not sure your guess is
> correct in this particular case as I just swapped the NIC I had for a
> different one and I seem to be getting the same sort of errors again.
> What's the likelihood that two NICs in a row have a faulty flash?

Well, you can set  new mac address also manually on ifcfg-ethX script
.. or ifconfig ..

--
Eero


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