On Fri, Dec 13, 2019 at 3:56 PM <k.bet...@gmail.com> wrote:

> > On Thu, Dec 12, 2019 at 4:27 PM <k.betsis(a)gmail.com&gt; wrote:
> >
> >
> >
> > Not external logical networks, with vNIC profiles, have no network filter
> > during the VM is started (or the vNIC is hotplugged),
> > allows any MAC address. This works without any hook required.
> > In most simple flow for a lab would be to remove the network filter from
> > ovirtmgmt, attach ovirtmgmt to a VM and boot the VM.
> >
> Well this is where theory contradicts practice...
> Based on what you say layer 2 frames would traverse the VM Network bridge
> and reach VyOS vnic, which they do not.
> Layer 2 frames are dropped after leaving the VM and before reaching the
> VyOS vnic.
> In theory if the VM bridge did not know where they should be forwarded it
> should broadcast them to all attached ports, which again it is not been
> done.
> So i am not sure if it is a bug, or a feature...
>

This works very reliably.
To check the oVirt networking related part, I tried the following setup:

VM1 <-vlan4->VM0<->ovirtmgmt<->dhcpserver/gateway

With a bridge on VM0 which connects the interfaces connected to vlan4 and
ovirtmgmt.
VM0 was the "CentOS 8 test image v20191009 for x86_64 (280f3e8)"
from ovirt-image-repository.
I installed cockpit in VM0 and added a bridge on cockpit web UI over the
two virtual NICs on VM0.

VM1 was able to get an IP address via DHCP and ping through the gateway to
the outside world.

Are you able to replicate this as a first step to isolate the problem?



> >
> >
> > As I wrote above, layer 2 tunneling from one VM to another should work.
> > Are you force to extend the network on layer 2? If not,
> > two VMs connected by a tunnel or a VPN might be more straight and would
> > even limit layer 2 broadcasts.
> I agree Layer 3 would be the best way forward but we need layer 2
> extension since the firewalls require it for high availability as well and
> we need pcsd VIPs attached to monitored services to have high availability.
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