[Users] networking: basic vlan help

[Itamar Heim]

On 01/23/2014 05:59 PM, Assaf Muller wrote:
> If you enable VLAN tagging on the management network, which is configured
> on eth0 (Which also provides internet access from my understanding) then
> you will connectivity as (I assume) your physical switches aren't configured
> for VLANs.
>
> For an all-in-one, what I would suggest is the following procedure:
> On your PC, create a dummy NIC via:
> sudo ip link add dev dummy_0 type dummy
> sudo ip link set dev dummy_0 up
>
> It's important that the name will be in the dummy_* format.
>
> Following that, go back to the GUI, select the host and hit Refresh Host Capabilities.
>
> You should see the new dummy_0 device as a host NIC.
>
> Create a VM network, and under the host Network Interfaces tab hit Setup Host Networks.
>
> Drag and drop the new VM network on dummy_0 (Don't give dummy_0 a boot protocol or an IP address
> in the edit network dialog).
>
> At this point you should be able to attach VM vNICs' to the new VM network and they won't
> be physically connected to any other network, but they'll be able to talk amongst themselves.
>
>
> The "private network" feature is planned* for oVirt 3.5, so in the future you'll be able
> to just define a network as a private one and everything will work automatically.
>
> * No promises!
>
>
> Assaf Muller, Cloud Networking Engineer
> Red Hat
>
> ----- Original Message -----
> From: "Robert Story" <rstory at tislabs.com>
> To: "users" <users at ovirt.org>
> Sent: Thursday, January 23, 2014 5:44:25 PM
> Subject: [Users] networking: basic vlan help
>
> Hello again,
>
> I'm new to VLANs and have a few questions. Right now I just have the mgmt
> interface (bridged with eth0) on my all-in-one oVirt test setup. I want to
> separate some VMs from the public facing net, which I think means that they
> need to be on a different VLAN.  I created two new networks, pubX and
> privY, with vlan ids X and Y, but couldn't assign them to eth0 because the
> current mgmt network is non-VLAN. I was about to enable VLAN tagging on the
> mgmt network, but I wanted to make sure that doing so wouldn't do anything
> to eth0 that would disrupt access to it (I only have remote access and don't
> want to lock myself out).  Also, if it is safe, does the mgmt vlan tag id
> matter? is 0 the right value?
>
> Any/all help, hints, tips or references to examples/links greatly
> appreciated.
>
>
> Robert
>
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wouldn't disabling 'vm network' on the mgmt network to simply allow the 
VLAN'd networks for VMs be simpler?
also, since this question/use-case came up several times past 2 weeks - 
do we have a good enough user feedback on why user can't attach a 
logical network to the same interface, suggesting there is a non-vlan'd 
network visible to VMs, and that if they want to use VLAN'd networks on 
the same nic, they should disable the 'vm network' role on the 
non-vlan'd network?