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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">Fernando,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">The issue can be triggered by a packet with the same source MAC address as VM has. If it’s received by network equipment from some different port, your VM could
stop receiving network traffic.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">There are two options. Either there is a network topology issue, or there is another VM with the same MAC address. The last
</span><span lang="EN-US" style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">is possible if you have another oVirt installation (testing? staging?) in the same network segment.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black">Fernando Frediani <fernando.frediani@upx.com.br> on behalf of FERNANDO FREDIANI <fernando.frediani@upx.com><br>
<b>Date: </b>Wednesday, 12 July 2017 at 23:10<br>
<b>To: </b>Pavel Gashev <Pax@acronis.com>, "users@ovirt.org" <users@ovirt.org><br>
<b>Subject: </b>Re: [ovirt-users] Bizzare oVirt network problem<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p>Hello Pavel<o:p></o:p></p>
<p>What you mean by another oVirt instance ? In one Datacenter it has 2 different clusters (or Datacenter in oVirt way of orrganizing things), but in the other Datacenter the oVirt Node is standlone.<o:p></o:p></p>
<p>Let me know.<o:p></o:p></p>
<p>Fernando<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 12/07/2017 16:49, Pavel Gashev wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">Fernando,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US">It looks like you have another oVirt instance in the same network segment(s). Don’t you?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black"><a href="mailto:users-bounces@ovirt.org"><users-bounces@ovirt.org></a> on behalf of FERNANDO FREDIANI
<a href="mailto:fernando.frediani@upx.com"><fernando.frediani@upx.com></a><br>
<b>Date: </b>Wednesday, 12 July 2017 at 16:21<br>
<b>To: </b><a href="mailto:users@ovirt.org">"users@ovirt.org"</a> <a href="mailto:users@ovirt.org">
<users@ovirt.org></a><br>
<b>Subject: </b>[ovirt-users] Bizzare oVirt network problem</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:Arial">Hello.<br>
<br>
I am facing a pretty bizzare problem in two of my Nodes running oVirt. A given VM running a few hundred Mbps of traffic simply stops passing traffic and only recovers after a reboot. Checking the bridge with 'brctl showmacs BRIDGE' I see the VM's MAC address
missing during this event.<br>
<br>
It seems the bridge simply unlearn the VM's mac address which only returns when the VM is rebooted.<br>
This problems happened in two different Nodes running in different hardware, in different datacenter, in different network architecture, different switch vendors and different bonding modes.<br>
<br>
The main differences these Nodes have compared to others I have and which don't show this problem are:<br>
- The CentOS 7 installed is a Minimal installation instead of oVirt-NG<br>
- The Kernel used is 4.12 (elrepo) instead of the default 3.10<br>
- The ovirtmgmt network is used also for the Virtual Machine showing this problem.<br>
<br>
Has anyone have any idea if it may have anything to do with oVirt (any filters) or any of the components different from a oVirt-NG installation ?<br>
<br>
Thanks<br>
Fernando<br>
<br>
<br>
</span><o:p></o:p></p>
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<o:p></o:p></p>
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