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I did had trouble with DHCP leasing with 2K3 R2 using Essex. At first 
boot, the lease was taken from our corporate DHCP server instead of 
nova-network dnsmasq.
I also noticed in EventViewer that, as you mention, DHCP leases were 
sometimes forgotten.

After long time investigating, I had to answer, neither no fix. The only 
workaround was to isolate physically our Essex setup to make sure DHCP 
broadcast was not reaching our corp Win2k DHCP server.

Sorry, I admit this is not a clear solution, only the move to Quantum 
with ProviderRouter fixed my issue.

-Sylvain

Le 21/02/2013 17:47, Razique Mahroua a écrit :
> Hi Guys,
> I'm currently using OPS Essex - from the Canonical repos.
> I'm running an heterogenous set of instanes (Ubutu, Debian, CentOS, 
> Server 2K3 R2, 2K8, etc..)
> I'm facing an issue with the XP instances, all are running the SP3 in 
> 64bits - What happens is that sometimes they are not able to renew 
> their IP address toward the DHCP server, thus dropping all network 
> connectivity. I've upgraded all my dnsmasq services by compiling the 
> version 2-61 - according to that thread 
> (https://lists.launchpad.net/openstack/msg11696.html)
> and let the long lease times in case of, but that doesn't change - I 
> still see in the event viewer of XP a warning about the DHCP service 
> complaining about a timeout.
>
> Any help would be much appreciated - my options are now as short as a 
> hobbit
> cheers
>
> *Razique Mahroua** - **Nuage & Co*
> razique.mahroua at gmail.com <mailto:razique.mahroua at gmail.com>
> Tel : +33 9 72 37 94 15
>
>
>
>
>
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