[one-users] OVH (So You Start) + OpenNebula + 1 IP

Pablo Hinojosa Nava pablohn6 at gmail.com
Tue Jul 22 19:07:58 PDT 2014

Hi all,
first of all, thanks for your assistance.
Finally I have bought 8 ip's to have a easier network set up.I did not find
how to automatize the creation ov vms with NAT network and port

In relation with the problem with OVH and the connection lost when you
attach a bridge to an interface, it is fixed.
The problem was the next:
reading this
I supposed I should leave the eth0 definition without change it. I mean, I
would have to add the br0 definition below the eth0 definition. I did not
realised that the /etc/network/interfaces must have only defined lo and br0
(attached to eth0) as it is documented. Having br0 with the main IP and lo
is how the interfaces should be set up.

So if you have the same problem, put the same network configuration than
the documented one.


Pablo Hinojosa.

2014-07-18 12:27 GMT+02:00 Joaquin Villanueva <jvillanueva at acb.es>:

>  Hi Valentin,
> Configure bridges in OVH servers is somewhat tricky. I've done it in the
> past (not for OpenNebula, but for XEN VMs running inside an OVH server) and
> the problem is the MAC filtering, as Valentin says. You have to add new
> MACs from your control panel, and use Failover IPs (not sure if this is
> mandatory, i was using these Failover IPs to give public access to my VMs)
> . See this docs:
> http://guias.ovh.es/DedicadoBridgeCliente
> http://guias.ovh.es/DedicadoMacVirtual
> Regards,
> El 18/07/14 08:03, Valentin Bud escribió:
> Hello Pablo,
> On Fri, Jul 18, 2014 at 6:53 AM, Pablo Hinojosa Nava <pablohn6 at gmail.com>
> wrote:
>>      Hi all,
>>  I am having problems trying to set up an OpenNebula host to virtualize
>> with KVM.
>>  I have bought a dedicated server with OVH (So You Start) with 1 publlc
>> IP.
>>  The public IP is on eth0 interface and each time I try to create a Linux
>> bridge (as is suggested during the installation
>> http://docs.opennebula.org/4.6/design_and_installation/quick_starts/qs_ubuntu_kvm.html#configure-the-network
>> ) I got frozen the SSH connection.
>>  If I edit the file /etc/network/interfaces, then I run
>> /etc/init.d/networking restart and it seems the server does not do
>> anything. If I restart the server with changes made, I cannot recover the
>> connection and I have to reinstall the operating system.
>>  If I try to create the bridge by hand, I the same problem (connection
>> lost) when I try to add the bridge to the public network interface (etc0).
>>  It seems OVH use Mac Filtering switches, so that could be the reason.
>>  I could buy a block of 8 or 16 IPs, but it does not change way to
>> configure OpenNebula.
>  If OVH is using MAC Filtering than you cannot bridge eth0 unless you
> create the bridge
> using the same MAC address as the one eth0 has. Never tried so I just
> suppose it
> could work.
>  You have at least three choices, you can either NAT a private class over
> eth0 and define that
> network in OpenNebula, you can acquire a /29 block, create a bridge, set
> the first public IP
> address on it and define the network in OpenNebula, or a combination of
> both.
>  You can choose to use Linux bridge or OpenvSwitch. Either of the two are
> really easy to
> set up and running. OpenNebula has network drivers for both of them. I
> would choose
> OpenvSwitch :).
>  Best,
> Valentin
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