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Hello Edwardh and all.
I keep getting these disconnects, were you able to find anything about
to suggest changing ?
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.
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.
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.
Fernando
On 24/07/2017 18:20, FERNANDO FREDIANI wrote:
Hello Edward, this happened again today and I was able to check more
details.
So:
- The VM stopped passing any network traffic.
- Checking 'brctl showmacs ovirtmgmt' it showed the VM's mac address
missing.
- 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.
- Another 'brctl showmacs ovirtmgmt' showed the VM's mac address
learned again by the bridge.
This Node server has the particularity of sharing the ovirtmgmt with
VMs. Could it possibly be the cause of the issue in any way ?
Thanks
Fernando
On 24/07/2017 09:47, FERNANDO FREDIANI wrote:
>
> 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.
>
> What type of things would make the bridge stop learning a given VM
> mac address ?
>
> Fernando
>
>
> On 23/07/2017 07:51, Edward Haas wrote:
>> 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?
>>
>> Thanks,
>> Edy,
>>
>> On Fri, Jul 21, 2017 at 5:36 PM, FERNANDO FREDIANI
>> <fernando.frediani(a)upx.com <mailto:fernando.frediani@upx.com>>
wrote:
>>
>> Has anyone had problem when using the ovirtmgmt bridge to
>> connect VMs ?
>>
>> 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.
>>
>> 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.
>> I don't see it in another environment where the ovirtmgmt is not
>> used for VMs.
>>
>> Does anyone have any clue about this type of behavior ?
>>
>> Fernando
>> _______________________________________________
>> Users mailing list
>> Users(a)ovirt.org <mailto:Users@ovirt.org>
>> http://lists.ovirt.org/mailman/listinfo/users
>> <http://lists.ovirt.org/mailman/listinfo/users>
>>
>>
>
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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>
</div>
<blockquote type="cite"
cite="mid:29aa7703-3da5-b75c-8259-b72d70bafa9e@upx.com">
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8">
<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>
</div>
<blockquote type="cite"
cite="mid:773f24f6-bd1e-fe35-4ed4-155e92b4a467@upx.com">
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8">
<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>
</div>
<blockquote type="cite"
cite="mid:CALmkdFSQAshds0_jMe-PO64XTd7tMDPa0-A1wKdxu061hAOAsQ@mail.gmail.com">
<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"
moz-do-not-send="true">fernando.frediani(a)upx.com</a>&gt;</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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rel="noreferrer" target="_blank"
moz-do-not-send="true">http://lists.ovirt.org/mailman<wbr...
</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
</blockquote>
<br>
</blockquote>
<br>
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