Xen users - Aug 2005 - Re: dom0 bootup -- Device eth0 has differet mac address than expecte

>> I think he''s having problems with Dom0 changing 
>> Mac address, rather than the domU (is that right?)
Yes, you are correct. It''s dom0 that seems to be getting a random MAC
and because of that Xen can''t t find the NIC and won''t load
eth0 because the MAC is different than what is expected. I''ve seen
others with the same problem and their (different) fixes haven''t worked
for me.
>> Does the original machine have more than one 
>> ethernet device?  Perhaps Linux is enumerating the 
>> cards in a different order when running under Xen so
>> you''re not using the card you think you are?
It''s a single NIC in the machine. Dell 2400. NIC on the motherboard.

Ah well, I''ve decided to forego CentOS 4.1 for now and reload the box
with Fedora Core 4 since the Xen directions seem to be a bit better for Xen on
FC4 than for Xen on CentOS 4.1/RHEL 4x. Hopefully that will make the world a
beautiful thing and allow me to actually see Xen working.

Thanks for the help.

Datto


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datto@charter.net wrote:
>>>I think he''s having problems with Dom0 changing 
>>>Mac address, rather than the domU (is that right?)
>>>      
>>>
>
>Yes, you are correct. It''s dom0 that seems to be getting a random
MAC
>
Eh? How is that possible? I thought the only random MAC created is the 
MAC for the vifs?
I use Lineox (another RHE clone, like CentOS) for dom0 and it works. The 
MAC for eth0 in dom0 is the same one I get as in native Linux. I did 
build my own Xen kernel though, to include some drivers just the way I 
like it.

AFAIK, as long as you have the necessary network drivers on dom0 kernel 
the interface names will stay the same on native Linux and Xen, which 
means the MAC is also the same.

Regards,

Fajar



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datto@charter.net wrote:
>>>I think he''s having problems with Dom0 changing 
>>>Mac address, rather than the domU (is that right?)
>>>      
>>>
>
>Yes, you are correct. It''s dom0 that seems to be getting a random
MAC
>
Eh? How is that possible? I thought the only random MAC created is the
MAC for the vifs?
I use Lineox (another RHE clone, like CentOS) for dom0 and it works. The
MAC for eth0 in dom0 is the same one I get as in native Linux. I did
build my own Xen kernel though, to include some drivers just the way I
like it.

AFAIK, as long as you have the necessary network drivers on dom0 kernel
the interface names will stay the same on native Linux and Xen, which
means the MAC is also the same.

Regards,

Fajar




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On Mon, 2005-08-29 at 19:00, datto@charter.net wrote:
> >> I think he''s having problems with Dom0 changing 
> >> Mac address, rather than the domU (is that right?)
> 
> Yes, you are correct. It''s dom0 that seems to be getting a random
MAC and because of that Xen can''t t find the NIC and won''t
load eth0 because the MAC is different than what is expected. I''ve seen
others with the same problem and their (different) fixes haven''t worked
for me.
> 
> >> Does the original machine have more than one 
> >> ethernet device?  Perhaps Linux is enumerating the 
> >> cards in a different order when running under Xen so
> >> you''re not using the card you think you are?
> 
> It''s a single NIC in the machine. Dell 2400. NIC on the
motherboard.
> 
> Ah well, I''ve decided to forego CentOS 4.1 for now and reload the
box with Fedora Core 4 since the Xen directions seem to be a bit better for Xen
on FC4 than for Xen on CentOS 4.1/RHEL 4x. Hopefully that will make the world a
beautiful thing and allow me to actually see Xen working.
Following the instructions for FC4 doesn''t help me. I''m trying
to load
the same machine as you using the instructions from
http://www.fedoraproject.org/wiki/FedoraXenQuickstart. If I do that It
loads  Xen 2.6. That is apparently the wrong one, it needs xen-3.0. If I
get that and the kernels that go with it, it won''t boot at all. I
suppose there are dependency issues.

I''m trying to track them down but I feel lost and forlorn because I
suspect that something this monstrous would have shown up in the wiki or
the mailing list. I''m afraid it''s some Dell thing. I also
don''t
understand the statement that FC4 has xen built in. I don''t see it
anywhere and it looks like you have to get everything from FC5 to get it
up. Why won''t xen2.0 work on FC4? Should I just go top FC3?


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> >> I think he''s having problems with Dom0 changing
> >> Mac address, rather than the domU (is that right?)
>
> Yes, you are correct. It''s dom0 that seems to be getting a random
MAC and
> because of that Xen can''t t find the NIC and won''t load
eth0 because the
> MAC is different than what is expected. I''ve seen others with the
same
> problem and their (different) fixes haven''t worked for me.
Weird!
> >> Does the original machine have more than one
> >> ethernet device?  Perhaps Linux is enumerating the
> >> cards in a different order when running under Xen so
> >> you''re not using the card you think you are?
>
> It''s a single NIC in the machine. Dell 2400. NIC on the
motherboard.
Really weird!

Is it possible that a different driver is being used for this NIC in XenLinux 
than native Linux (compare the output from your network driver in
"dmesg" on
both configurations)?  Not entirely sure why this''d make a difference 
though...

Cheers,
Mark
>
> Ah well, I''ve decided to forego CentOS 4.1 for now and reload the
box with
> Fedora Core 4 since the Xen directions seem to be a bit better for Xen on
> FC4 than for Xen on CentOS 4.1/RHEL 4x. Hopefully that will make the world
> a beautiful thing and allow me to actually see Xen working.
>
> Thanks for the help.
>
> Datto
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
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> Ah well, I''ve decided to forego CentOS 4.1 for now and reload the
box with
> Fedora Core 4 since the Xen directions seem to be a bit better for Xen on
> FC4 than for Xen on CentOS 4.1/RHEL 4x. Hopefully that will make the world
> a beautiful thing and allow me to actually see Xen working.
I''m not sure that FC4 will behave any better, since there seems to be 
something really weird going on here :-( - if it does I''ll get even
more
weirded-out than I already am ;-)

Cheers,
Mark

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On Wed, 2005-08-31 at 12:39 +0100, Mark Williamson
wrote:
> > Ah well, I''ve decided to forego CentOS 4.1 for now and reload
the box with
> > Fedora Core 4 since the Xen directions seem to be a bit better for Xen
on
> > FC4 than for Xen on CentOS 4.1/RHEL 4x. Hopefully that will make the
world
> > a beautiful thing and allow me to actually see Xen working.
> 
> I''m not sure that FC4 will behave any better, since there seems to
be
> something really weird going on here :-( - if it does I''ll get
even more
> weirded-out than I already am ;-)
> 
> Cheers,
> Mark
> 
Does your ethX config have a  
HWADDR=XX.XX.XX.XX.XX.XX.XX 
in it?
May be worth a shot to try to remove it and see what happens.

Regards,
Ted




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