Xen users - Apr 2007 - network error, even when rebooting into CentOS smp kernel

Tried posting this before, but never seemed to appear on the list, so
retrying. Apologies if it ends up posted twice:

 After installing xen-3.0.4_1-install-x86_32p.tgz on a CentOS 4.4, I was
getting a network error:
Device eth0 has different MAC address than expected

I have searched for hours here and other places, tried all the recommended
solutions and no luck. However, my real question is this... Even after I
reboot into the previous CentOS kernel ( CentOS (2.6.9-42.0.10.ELsmp )), I
get the same network error. I have tried this on 2 different boxes and it is
completely reporducible. (Different network cards, too.)

Strangely, I can boot into the non-smp kernel: CentOS (2.6.9-42.0.10.EL) and
get networking.

What is Xen doing that is persistent and causing network failure even after
fallback to the original smp kernel?? (Maybe it is worth saying that the
network was 100% fine before Xen install, in fact, sadly it is a completely
remote server, so that is the only way to get into the box unless I want to
pay for an expensive remote hands service!!)

How can I undo these changes and restore networking to my CentOS smp kernel?


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