<div dir="ltr"><div><div><div><div>Hello Fernando,<br><br></div>Have you taken the tcpdump in the VM to see what traffic is sent out?<br></div>Your host is a Centos 7.3? If so how come it has such a kernel version?<br><br></div><div>Have you see anything in /var/log/messages when it gets disconnected?<br><br></div>Thanks,<br></div>Edy.<br><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 28, 2017 at 9:01 PM, FERNANDO FREDIANI <span dir="ltr"><<a href="mailto:fernando.frediani@upx.com" target="_blank">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">
<div bgcolor="#FFFFFF" text="#000000">
<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><span class="HOEnZb"><font color="#888888">
<p>Fernando<br>
</p></font></span><div><div class="h5">
<br>
<div class="m_3668260234015306146moz-cite-prefix">On 24/07/2017 18:20, FERNANDO FREDIANI
wrote:<br>
</div>
<blockquote type="cite">
<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="m_3668260234015306146moz-cite-prefix">On 24/07/2017 09:47, FERNANDO
FREDIANI wrote:<br>
</div>
<blockquote type="cite">
<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="m_3668260234015306146moz-cite-prefix">On 23/07/2017 07:51, Edward Haas
wrote:<br>
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<blockquote type="cite">
<div dir="ltr">
<div>
<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>
</div>
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">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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</blockquote>
</div>
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</div>
</blockquote>
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</blockquote>
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</blockquote>
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