[CentOS] the wandering MAC?

Eero Volotinen eero.volotinen at iki.fi
Wed Oct 13 15:08:32 EDT 2010


2010/10/13 Boris Epstein <borepstein at gmail.com>:
> On Wed, Oct 13, 2010 at 2:55 PM, Eero Volotinen <eero.volotinen at iki.fi> wrote:
>> 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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>
> OK... how do I set it? Or, more importantly, how do I find out what
> MAC the card currently thinks it has?

Well, ifconfig?

It really doesn't matter, just generate random one..

edit  /etc/sysconfig/network-scripts/ifcfg-ethX

Remove HWADDR=00:00:00:00:00:00
add MACADDR=WH:AT:YO:UW:AN:T0

It should work this way and then just service network restart ..

--
Eero



--
Eero


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