Hello list

I am wondering if anyone has tried this before? I am trying to consolidate my 
lab to an oVirt cluster which consists of oVirt (4.3.8) and 2 KVM hypervisors 
(CentOS 7.7.). Among other things, one of my efforts is a small ESXi + vCenter 
lab. In addition, I have a standalone KVM hypervisor. I can run nested ESXi 6.7 
on top of the standalone KVM hypervisor (with nested KVM enabled) without any 
problem. However, on top of oVirt-controlled KVMs I have some issues. The 
hypervisors have nested kvm support enabled via vdsm hooks. qemu emulates e1000 
for a nested ESXi vm. ESXi installation process goes smooth but as soon as I 
enable management network and restart it, the nested ESXi cannot communicate 
with the outside world (DNS ping cannot pass). Also https connection to VMWare 
ESXi web gui and ping to the ESXi also fail. I noticed on my client machine, 
that ARP requests are incomplete for ESXI as well.  Within oVirt, I see no 
packet drops in "Network interface" tab for the nested ESXi.

In addition, I have a few, ordinary, non-nested VMs running on the same network 
as the nested vm and I can normally establish connection to those machines. 
Additionally, as a test, I created a nested KVM vm on top of the oVirt cluster, 
same network as the nested ESXi and it works as expected - can spin VMs, can 
connect to it. The network assigned to the nested ESXi has a "No network 
filter" vNic profile applied.

I tried to google for a solution but found only this: 
https://github.com/mechinn/kvmhidden - not sure if this is the solution at all 
(also, I wonder if this is still up-to-date after 3+ years)?  Could I please 
ask if anyone tried something similar and experienced this problem? Is there 
any additional configuration that I should apply to the oVirt cluster?

Thank you very much in advance!

Regards,
Branimir
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