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It seems that this 

https://bugs.launchpad.net/nova/+bug/1240849

can be the cause of my problem. And it is fixed on IceHouse.
Does someone confirm ?

	A.

On 23 Apr 2014, at 16:44, Alvise Dorigo <alvise.dorigo at pd.infn.it> wrote:

> Hi,
> I've an Havana installation with distributed services (controller node,
> network node running only the neutron agents, compute node).
> The Network node is redundant with dhcp agent in HA mode active/active
> (2 instances running on 2 different network nodes).
> 
> I noticed that, often, after an Hard Reboot the VM is unable to talk to
> the dhcp agent to obtain its private IP. I observed that when this
> happens, the tap of the VM doesn't have the VLAN tag it had before, during the normal functioning.
> 
> This problem doesn't occur if a Soft Reboot is performed (e.g. a
> "reboot" issued from the console).
> 
> Is this known or experienced by someone else ?
> 
> thanks,
> 
>     Alvise
> 
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