[ovirt-users] ?==?utf-8?q? 2 Vlans on one VM nic

[Derek Atkins]

Perhaps showing my ignorance, but...

Can't you set up three virtual tagged bridges in ovirt?  Each bridge
would be tagged with the proper vlans, and then connect to the correct
VMs?  Is there something that prevents you from creating tagged bridges
that all link into a non-tagged physical NIC?

Or, possibly, could you set up the physical NIC for all the vlans and
then split them out into the separate virtual bridges?

This should prevent the admin on VM1 from accessing the vlans of the
other VMs because they are attached to different (tagged) bridges.  Or
is there something that prevents this approach?

-derek

Gianluca Cecchi <gianluca.cecchi at gmail.com> writes:

> On Fri, Nov 18, 2016 at 10:28 AM, MOUCHOIR David <David.Mouchoir at isae.fr>
> wrote:
>
>      That's what I understood
>     I don't have problem configuring VLANs on nics and switches, I've already
>     done many times
>     What I said is
>     If I have 3 VMs
>     VM1 needs vlan1 and 2
>     VM2 needs vlan3 and 4
>     VM3 needs vlan5 and vlan6
>    
>     for security reason I don't want any of these VM to be able to "see"
>     traffic of other VLAN
>     I will need 3 interfaces, one per trunk
>    
>     Could Vswitch be the solution ? It seems to be implemented in ovirt, but
>     documentation looks very poor ( or I didn't find the documentation ;) )
>
> I'm not a security expert.
> For sure If you don't trust the sysadmin of the VMs operating system or if
> anyone has access to the virtual console so it could attach a live distro and
> so on.... you had better to have 3 different physical network adapters on your
> hypervisors and create on them 
> trunk for id 1 and 2 on first
> trunk for id 3 and 4 on second
> trunk for id 5 and 6 on third
>
> But from a functionality point of view (and also segregation if you don't
> modify configuration of OS) you can have only one physical adapter on
> hypervisor, allow id 1, 2, 3, 4, 5, 6 on it and then configure
> on VM1 OS configure ifcfg-eth0.1 and ifcfg-eth0.2 files
> on VM2 OS configure ifcfg-eth0.3 and ifcfg-eth0.4 files
> on VM3 OS configure ifcfg-eth0.5 and ifcfg-eth0.6 files
>  
> It depends on who manages ovirt infrastructure, network infrastructure and OS
> infrastructure and if they are different people...
>
> I don't know if any virtualization vendor can provide the level of security
> you want using only one physical adapter....
>
> GIanluca
>
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-- 
       Derek Atkins                 617-623-3745
       derek at ihtfp.com             www.ihtfp.com
       Computer and Internet Security Consultant