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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Segoe UI","sans-serif"">Da:</span></b><span style="font-size:10.0pt;font-family:"Segoe UI","sans-serif""> users-bounces@ovirt.org [mailto:users-bounces@ovirt.org]
<b>Per conto di </b>Jorick Astrego<br>
<b>Inviato:</b> mercoledì 29 luglio 2015 14:26<br>
<b>A:</b> users@ovirt.org<br>
<b>Oggetto:</b> Re: [ovirt-users] R: R: R: R: R: R: R: R: PXE boot of a VM on vdsm don't read DHCP offer<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<br>
On 07/29/2015 12:12 PM, NUNIN Roberto wrote: <br>
<span style="color:black">>> -----Messaggio originale----- </span><br>
<span style="color:black">>> Da: Michael S. Tsirkin [mailto:mst@<a href="mailto:redhat.com">redhat.com</a>]
</span><br>
<span style="color:black">>> Inviato: mercoledì 29 luglio 2015 12:03 </span><br>
<span style="color:black">>> A: NUNIN Roberto </span><br>
<span style="color:black">>> Cc: Fabian Deutsch; users@<a href="mailto:ovirt.org">ovirt.org</a>
</span><br>
<span style="color:black">>> Oggetto: Re: R: [ovirt-users] R: R: R: R: R: R: PXE boot of a VM on vdsm don't
</span><br>
<span style="color:black">>> read DHCP offer </span><br>
<span style="color:black">>> </span><br>
<span style="color:black">>> On Wed, Jul 29, 2015 at 12:00:38PM +0200, NUNIN Roberto wrote:
</span><br>
<span style="color:black">>>>> -----Messaggio originale----- </span><br>
<span style="color:black">>>>> Da: users-bounces@<a href="mailto:ovirt.org">ovirt.org</a> [mailto:users-bounces@<a href="mailto:ovirt.org">ovirt.org</a>] Per conto
</span><br>
<span style="color:black">>> di </span><br>
<span style="color:black">>>>> Michael S. Tsirkin </span><br>
<span style="color:black">>>>> Inviato: giovedì 9 luglio 2015 15:15 </span><br>
<span style="color:black">>>>> A: Fabian Deutsch </span><br>
<span style="color:black">>>>> Cc: users@<a href="mailto:ovirt.org">ovirt.org</a>
</span><br>
<span style="color:black">>>>> Oggetto: Re: [ovirt-users] R: R: R: R: R: R: PXE boot of a VM on vdsm don't
</span><br>
<span style="color:black">>> read </span><br>
<span style="color:black">>>>> DHCP offer </span><br>
<span style="color:black">>>>> </span><br>
<span style="color:black">>>>> On Thu, Jul 09, 2015 at 08:57:50AM -0400, Fabian Deutsch wrote:
</span><br>
<span style="color:black">>>>>> ----- Original Message ----- </span><br>
<span style="color:black">>>>>>> On Wed, Jul 08, 2015 at 09:11:42AM +0300, Michael S. Tsirkin wrote:
</span><br>
<span style="color:black">>>>>>>> On Tue, Jul 07, 2015 at 05:13:28PM +0100, Dan Kenigsberg wrote:
</span><br>
<span style="color:black">>>>>>>>> On Tue, Jul 07, 2015 at 10:14:54AM +0200, NUNIN Roberto wrote:
</span><br>
<span style="color:black">>>>>>>>>>> On Mon, Jul 06, 2015 at 10:33:59AM +0200, NUNIN Roberto
</span><br>
<span style="color:black">>> wrote: </span><br>
<span style="color:black">>>>>>>>>>>> Hi Dan </span><br>
<span style="color:black">>>>>>>>>>>> </span><br>
<span style="color:black">>>>>>>>>>>> Sorry for question: what do you mean for interface vnetxxxx ?
</span><br>
<span style="color:black">>>>>>>>>>>> Currently our path is : </span><br>
<span style="color:black">>>>>>>>>>>> eno1 - eno2 ---- bond0 ----- bond.3500 (VLAN) ------ bridge -----
</span><br>
<span style="color:black">>>>>>>>>>>> vm. </span><br>
<span style="color:black">>>>>>>>>>>> </span><br>
<span style="color:black">>>>>>>>>>>> Which one of these ? </span><br>
<span style="color:black">>>>>>>>>>>> Moreover, reading Fabian statements about bonding limits,
</span><br>
<span style="color:black">>>>> today I </span><br>
<span style="color:black">>>>>>>>>>>> can try </span><br>
<span style="color:black">>>>>>>>>>> to switch to a config without bonding. </span>
<br>
<span style="color:black">>>>>>>>>>> </span><br>
<span style="color:black">>>>>>>>>>> "vm" is a complicated term. </span><br>
<span style="color:black">>>>>>>>>>> </span><br>
<span style="color:black">>>>>>>>>>> `brctl show` would not show you a "vm" connected to a bridge.
</span><br>
<span style="color:black">>>>> When </span><br>
<span style="color:black">>>>>>>>>>> you </span><br>
<span style="color:black">>>>>>>>>>> WOULD see is a vnet888 tap device. The "other side" of this
</span><br>
<span style="color:black">>> device </span><br>
<span style="color:black">>>>> is </span><br>
<span style="color:black">>>>>>>>>>> held by qemu, which implement the VM. </span>
<br>
<span style="color:black">>>>>>>>>> Ok, understood and found it, vnet2 </span><br>
<span style="color:black">>>>>>>>>> </span><br>
<span style="color:black">>>>>>>>>>> I'm asking if the dhcp offer has reached that tap device.
</span><br>
<span style="color:black">>>>>>>>>> No, the DHCP offer packet do not reach the vnet2 interface, I can
</span><br>
<span style="color:black">>> see </span><br>
<span style="color:black">>>>>>>>>> only DHCP DISCOVER. </span><br>
<span style="color:black">>>>>>>>> Ok, so it seems that we have a problem in the host bridging.
</span><br>
<span style="color:black">>>>>>>>> </span><br>
<span style="color:black">>>>>>>>> Is it the latest kernel-3.10.0-229.7.2.el7.x86_64 ?
</span><br>
<span style="color:black">>>>>>>>> </span><br>
<span style="color:black">>>>>>>>> Michael, a DHCP DISCOVER is sent out of a just-booted guest, and
</span><br>
<span style="color:black">>>>> OFFER </span><br>
<span style="color:black">>>>>>>>> returns to the bridge, but is not propagated to the tap device.
</span><br>
<span style="color:black">>>>>>>>> Can you suggest how to debug this further? </span>
<br>
<span style="color:black">>>>>>>> Dump packets including the ethernet headers. </span>
<br>
<span style="color:black">>>>>>>> Likely something interfered with them so the eth address is wrong.
</span><br>
<span style="color:black">>>>>>>> </span><br>
<span style="color:black">>>>>>>> Since bonding does this sometimes, this is the most likely culprit.
</span><br>
<span style="color:black">>>>>>> We've ruled this out already - Roberto reproduces the issue without a
</span><br>
<span style="color:black">>>>>>> bond. </span><br>
<span style="color:black">>>>>> To me this looks like either a regression in the host side bridging. But
</span><br>
<span style="color:black">>> otoh it </span><br>
<span style="color:black">>>>> doesn't look </span><br>
<span style="color:black">>>>>> like it's happening always, because otherwise I'd expect more noise
</span><br>
<span style="color:black">>> around </span><br>
<span style="color:black">>>>> this issue. </span><br>
<span style="color:black">>>>>> - fabian </span><br>
<span style="color:black">>>>> Hard to say. E.g. forwarding delay would do this for a while.
</span><br>
<span style="color:black">>>>> If eth address of the packets is okay, poke at the fbd, maybe there's
</span><br>
<span style="color:black">>>>> something wrong there. Maybe stp is detecting a loop - try checking that.
</span><br>
<span style="color:black">>>> Someone is checking this ? </span><br>
<span style="color:black">>>> In tested config SPT was off. </span><br>
<span style="color:black">>> Then maybe you have a loop :) </span><br>
<span style="color:black">> That was already checked, the MAC was unique in the VLAN.
</span><br>
<span lang="EN-US" style="color:black">> </span><span lang="EN-US"><br>
<span style="color:black">> RN </span><br>
<span style="color:black">> </span><br>
<br>
<span style="color:#1F497D">></span>Did you also try a reboot of the VM? We have the same issue with foreman
<br>
<span style="color:#1F497D">></span>and both Libvirt and oVirt. </span>On second boot PXE boots properly from DHCP.
<span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Yes tried more than one time the reboot, without changes.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">RN<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><br>
<br>
<span style="color:#1F497D">></span>Haven't had the time to investigate yet so we're using mostly image
<br>
<span style="color:#1F497D">></span>based provisioning on oVirt at the moment. <br>
<br>
<br>
<br>
<br>
<br>
</span><span lang="NL" style="color:black;mso-fareast-language:EN-GB">Met vriendelijke groet, With kind regards,<br>
<br>
</span><span style="color:black">Jorick Astrego</span><b><span style="color:#604C78"><br>
<br>
Netbulae Virtualization Experts </span></b><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:7.5pt">Tel: 053 20 30 270<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt"><a href="mailto:info@netbulae.eu">info@netbulae.eu</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt">Staalsteden 4-3A<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt">KvK 08198180<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt">Fax: 053 20 30 271<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt"><a href="http://www.netbulae.eu">www.netbulae.eu</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt">7547 TA Enschede<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt">BTW NL821234584B01<o:p></o:p></span></p>
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