[pve-devel] More than 10 interfaces in lxc containers

Stephan Leemburg sleemburg at it-functions.nl
Sun Aug 23 18:14:20 CEST 2020

Hi Dietmar,

I have done some more testing on my openvswitch test proxmox system.

If I don't put a tag on the device, it seems to behave like a trunk. So, 
that would solve my problem. _If_ the hosts where openvswitch enabled.

Which they are not. So, in order to solve this I have to migrate them 
(these are operational systems hosting clients systems) to a openvswitch 

They where setup before openvswitch became operationally viable.

If this resolves the issue, then that must be done. But in the mean 
time, it would be very nice if you could just accept the patch to allow 
for the 32 interfaces instead of just the 10.

If you have other suggestions, links, then I would be happy to follow 
them and do my own research. I could also contribute some documentation 
for others facing the same issues.

Kind regards,


On 23-08-2020 17:04, Stephan Leemburg wrote:
> Hi Dietmar,
> As said, the node has tradtional vmbr (brctl) bridges. So with that 
> setup, I do not know how to do what you suggest. But I am happy to learn.
> And as far as I can tell on my test server that uses openvswitch, I 
> can only assign one tag to an interface in a container.
> So also that will not work. If I could assign multiple VLAN's to an 
> openswitch based container interface then I could create the vlan 
> interfaces inside the container.
> Ending up with as many vlan devices required in the container, so im 
> my case with more than 10.
> That would - however - require changing the current production setup 
> on the OVH server(s) to switch from traditional bridging to openvswitch.
> OVH servers are good in price/performance. Support is not so good and 
> there is no console, so if something goes wrong you have to order (and 
> pay for) a kvm to be attached for one day. That can take up to an hour 
> or so to be performed as it is work that has to be performed manually 
> by a site engineer in the data center.
> But if there is a way, then I would be more than glad to learn about it.
> Kind regards,
> Stephan
> On 23-08-2020 16:24, Dietmar Maurer wrote:
>>> If it would be possible to provide a 'trunk' openvswitch interface to
>>> the CT, then from within the CT vlan devices could be setup from the
>>> trunk, but in the end that will still create 10+ interfaces in the
>>> container itself.
>> Cant you simply use a single network interface, then configure the vlans
>> inside the firewall?
>> IMHO, using one interface for each VLAN is the wrong approach. I am sure
>> next time people will ask for 4095 interfaces ...
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