[Users] networking: basic vlan help

[Assaf Muller]

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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