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<p>Hello.</p>
<p>Despite I didn't get any feedback on this topic anymore I just
wanted to let people know that since I moved the VM to another
oVirt Cluster running oVirt-Node-NG and Kernel 3.10 the problem
stopped happening. Although I still don't know the cause of it I
suspect it may have to do with the kernel that other Host
(hypervsior) is running (4.12) as that is the only once running
disk kernel for an specific reason.<br>
To support this suspicious in the past I had another Hypervisor
also running kernel 4.12 and a VM that does that same job had the
same issue. After I have rebooted the Hypervisor back to default
kernel (3.10) the problem didn't happen anymore.</p>
<p>If anyone ever faces this or anything similar please let me know
as I am always interested to find out the root of this issue.</p>
<p>Regards<br>
Fernando<br>
</p>
<br>
<div class="moz-cite-prefix">On 28/07/2017 15:01, FERNANDO FREDIANI
wrote:<br>
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<p>Hello Edwardh and all.</p>
<p>I keep getting these disconnects, were you able to find
anything about to suggest changing ?</p>
<p>As I mentioned this machine different from the others where it
never happened uses the ovirtmgmt network as VM network and has
kernel 4.12 instead of the default 3.10 from CentOS 7.3. It
seems a particular situation that is triggering this behavior
but could not gather any hint yet.</p>
<p>I have tried to run a regular arping to force the bridge always
learn the VMs MAC address but it doesn't seem to work and every
in a while the bridge 'forgets' that particular VM mac address.<br>
I have also even rebuilt the VM completely changing its
operating system from Ubuntu 16.04 to CentOS 7.3 and the same
problem happened.</p>
<p>Fernando<br>
</p>
<br>
<div class="moz-cite-prefix">On 24/07/2017 18:20, FERNANDO
FREDIANI wrote:<br>
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<p>Hello Edward, this happened again today and I was able to
check more details.</p>
<p>So:</p>
<p>- The VM stopped passing any network traffic.<br>
- Checking 'brctl showmacs ovirtmgmt' it showed the VM's mac
address missing.<br>
- I then went to oVirt Engine, under VM's 'Network Interfaces'
tab, clicked Edit and changed the Link State to Down then to
Up and it recovered its connectivity.<br>
- Another 'brctl showmacs ovirtmgmt' showed the VM's mac
address learned again by the bridge.</p>
<p>This Node server has the particularity of sharing the
ovirtmgmt with VMs. Could it possibly be the cause of the
issue in any way ?</p>
<p>Thanks<br>
Fernando<br>
</p>
<br>
<div class="moz-cite-prefix">On 24/07/2017 09:47, FERNANDO
FREDIANI wrote:<br>
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<p>Not tried this yet Edwardh, but will do at next time it
happens. THe source mac address should be the mac as the VM.
I don't see any reason for it to change from within the VM
ou outside.</p>
<p>What type of things would make the bridge stop learning a
given VM mac address ?</p>
<p>Fernando<br>
</p>
<br>
<div class="moz-cite-prefix">On 23/07/2017 07:51, Edward Haas
wrote:<br>
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<div>Have you tried to use tcpdump at the VM vNIC to
examine if there is traffic trying to get out from
there? And with what source mac address?<br>
<br>
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Thanks,<br>
</div>
Edy,<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Jul 21, 2017 at 5:36 PM,
FERNANDO FREDIANI <span dir="ltr"><<a
href="mailto:fernando.frediani@upx.com"
target="_blank" moz-do-not-send="true">fernando.frediani@upx.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Has
anyone had problem when using the ovirtmgmt bridge to
connect VMs ?<br>
<br>
I am still facing a bizarre problem where some VMs
connected to this bridge stop passing traffic.
Checking the problem further I see its mac address
stops being learned by the bridge and the problem is
resolved only with a VM reboot.<br>
<br>
When I last saw the problem I run brctl showmacs
ovirtmgmt and it shows me the VM's mac adress with
agening timer 200.19. After the VM reboot I see the
same mac with agening timer 0.00.<br>
I don't see it in another environment where the
ovirtmgmt is not used for VMs.<br>
<br>
Does anyone have any clue about this type of behavior
?<br>
<br>
Fernando<br>
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