Hi Lacho,
Can you run the virtio drivers ? 
They are the most tested in KVM .
Also, can you run a tcpdump (with e1000) and check what is going on when the 
network disapperead? 
Best Regards,Strahil Nikolov
    В неделя, 12 януари 2020 г., 09:22:52 ч. Гринуич+2, Latchezar Filtchev 
<lat...@aubg.bg> написа:  
 
 
Dear Strahi,
 
  
 
I tried rtl8139. The behavior is the same.
 
  
 
Best,
 
Latcho
 
  
 
  
 
From: Strahil <hunter86...@yahoo.com>
Sent: Sunday, January 12, 2020 1:19 AM
To: Latchezar Filtchev <lat...@aubg.bg>; users <users@ovirt.org>
Subject: Re: [ovirt-users] Unstable VM network connectivity after upgrade 4.2.8 
to 4.3.7
 
  
 
Hi Latcho,
 
Most probably it's a bug.
Have you tried  virtio and/or rtl-based  NIC ?
 
As far as I know, CentOS 5 supports Virtio after Kernel >= 2.6.25 .
 
Best Regards,
Strahil Nikolov
 
On Jan 11, 2020 19:54, Latchezar Filtchev <lat...@aubg.bg> wrote:
 

Hello Everyone,
 
 
 
I am aware my guest OS is out of support but I experienced the following:
 
 
 
oVirt – 4.2.8 (self-hosted engine) 
 
VM – CentOS 5.2; two VNIC’s ( driver used e1000) connected to different VLAN’s; 
 - no issues with network connectivity
 
 
 
After upgrade to oVirt 4.3.7
 
 
 
The same VM starts normally. Network is available for several seconds (10 – 20 
pings) and then it disappears. The machine works but no ping to/from VM. When I 
am returning the same machine (via export domain) to oVirt 4.2.8 environment – 
it works as expected.
 
 
 
Can someone advise on this? Any help will be greatly appreciated. 
 
 
 
Thank you.
 
Best,
 
Latcho
 
 
 
 
 
 
 
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