11:27 a.m.
On Fri, Nov 18, 2016 at 5:57 PM, Derek Atkins <derek(a)ihtfp.com> wrote:
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
A tagged/vlan network has one VLAN set, not multiple ones.
A non tagged/vlan network ignores tagging, it passes packets as is, either
tagged
ones or non tagged ones.
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(a)gmail.com> writes:
> On Fri, Nov 18, 2016 at 10:28 AM, MOUCHOIR David <David.Mouchoir(a)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
To increase security, at least in the sense raised here, libvirt provides
the ability
to specify the exact vlan tags allowed for a vnic, but only with OVS and the
underlying host switch.
Please see: http://libvirt.org/formatdomain.html#elementVlanTag
We are actually on-flight to use OVS as an alternative to the linux bridge,
but it
is still not fully ready and this trunking setting for the vnic would need
to be added
as it is not in our current plans (although a hook can do a good job to set
it).
Thanks,
Edy.