[CentOS] Strange XEN on CentOS HWaddr Address Issue

Brett Serkez bserkez at gmail.com
Tue Aug 4 16:30:45 UTC 2009

On Tue, Aug 4, 2009 at 9:09 AM, Christoph Maser<cmr at financial.com> wrote:
> 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.


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