[CentOS] Strange XEN on CentOS HWaddr Address Issue

Ross Walker rswwalker at gmail.com
Tue Aug 4 16:50:26 UTC 2009

On Tue, Aug 4, 2009 at 12:30 PM, Brett Serkez<bserkez at gmail.com> wrote:
> On Tue, Aug 4, 2009 at 9:09 AM, Christoph Maser<cmr at financial.com> wrote:
> <snip>
>> When Xen starts does some trickery with your interfaces. You should see
>> FE:FF:FF:FF:FF:FF on device peth0 and the real MAC-address on device
>> eth0.
>> All Xen vif devices will show also MAC FE:FF:FF:FF:FF:FF. That is
>> totally normal.
> I  wanted to clarify on this point.  Understood as far as the above,
> but the issue is that the PHYSICAL MAC was changed to
>  This went so far as to still have this value even after rebooting on
> the standard kernel and then uninstalling XEN:
> # dmesg | grep eth1
> eth1: RTL8110s at 0xee156c00, fe:ff:ff:ff:ff:ff, XID 04000000 IRQ 22
> What ever happened during the first boot of XEN caused a permanent
> change to this NIC as far as I can tell.

Maybe because you are looking at the bridge's mac and not the
ethernet's which would be peth0.


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