Re: [Xen-users] network error, even when reboot into non-Xen smp kernel

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Robert Ficcaglia wrote:
> 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
First, why aren't you using the RHEL 4 RPM? It's true they accidentally 
left out the documentaiton in that, but it works fine, and has RPM 
kernels for both Dom0 and DomU.
Second, unless you hard-code your MAC address in your Xen configuration 
file, it's going to get changed randomly in your DomU's every freaking 
time you reboot them. And RedHat's network setup tools look in 
/etc/sysconfig/network-scripts/ifcfg-eth* to associate the HWADDR 
setting with specific network devices. This keeps eth0 and eth1 from 
getting swapped around for different kernel configurations, and helps 
keep the network device names consistent when adding wi-fi or USB 
network devices.
You can also simply comment out the HWADDR lines in 
/etc/sysconfig/networ-kscripts/ifcfg-eth* if you have only one network 
device and thus aren't worried about swapping them.
Is the problem in your Dom0? Do you have multiple network devices?

> 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.
See above.

>  
> 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!!)

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