Re: [Xen-users] disappearing network?

[Stefan Dannemann <sd@xxxxxxxxxxxxxxxx>]

Hi Tom,

I have quite similar effects on my Ubuntu Gutsy x86_64 with Xen 3.1.

If the network setup is mangled in some way, shutting down writes a different 
MAC Adress to my NIC device, usually FE:FF:FF:FF:FF:FF from the peth0 device.
The next reboot brings the NIC up as eth1 (through udev device naming in 
/etc/udev/rules.d/70-persistent-net.rules). But with eth1 as the only NIC xenbr0 
doesn't work.
So I have no luck after reboot.

As a workaround I write my MAC Address back to NIC in /etc/rc.d/xend
/etc/init.d/xend
    stop)
          xend stop
   ===>   ifconfig peth0 hw ether 00:11:22:33:44:55 down
   ===>   ifconfig eth1 hw ether 00:11:22:33:44:55 down


Booting with non-xen kernel doesn't establich the xenbr0. This is an other way 
to get your NIC with your proper MAC adress up, named as eth0 through 
/etc/udev/rules.d/70-persistent-net.rules.
Stefan


Tom Horsley wrote:
> I'm wondering if anyone else has encountered this network problem:
>
> The xen server is up for several weeks, then suddenly the network 
> connection to the
> box stops working. Rebooting doesn't fix it, but rebooting to a non-xen 
> kernel
> does fix it, then rebooting back into xen again, I find that it is once 
> again working.
> Happened most recently with x86_64 debian etch and Xen 3.2, before that 
> happened
> with sles10sp1 and xen 3.1 (this is the same hardware just running 
> different host
> linux & xen these days).
>
> I have difficulty imagining where it could be caching "the network should be
> broken" flag across reboots, or why rebooting with a different kernel 
> would fix it,
> but I thought I'd ask on the microscopic chance that it makes sense to 
> someone
> out there :-).
>
>
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