[ovirt-users] R: R: R: R: R: PXE boot of a VM on vdsm don't read DHCP offer

[NUNIN Roberto]

Hi Dan

Sorry for question: what do you mean for interface vnetxxxx ?
Currently our path is :
eno1 - eno2  ---- bond0 ----- bond.3500 (VLAN) ------ bridge ----- vm.

Which one of these ?
Moreover, reading Fabian statements about bonding limits, today I can try to switch to a config without bonding.

BR

Roberto

> -----Messaggio originale-----
> Da: Dan Kenigsberg [mailto:danken at redhat.com]
> Inviato: lunedì 6 luglio 2015 10:02
> A: NUNIN Roberto
> Cc: users at ovirt.org; ibarkan at redhat.com
> Oggetto: Re: R: R: R: [ovirt-users] R: PXE boot of a VM on vdsm don't read
> DHCP offer
>
> On Fri, Jul 03, 2015 at 04:32:50PM +0200, NUNIN Roberto wrote:
> > Thanks for answering. My considerations below.
> >
> > BR,
> >
> > ROberto
> > > -----Messaggio originale-----
> > > Da: Dan Kenigsberg [mailto:danken at redhat.com]
> > > Inviato: venerdì 3 luglio 2015 12:31
> > > A: NUNIN Roberto
> > > Cc: users at ovirt.org; ibarkan at redhat.com
> > > Oggetto: Re: R: R: [ovirt-users] R: PXE boot of a VM on vdsm don't read
> > > DHCP offer
> > >
> > > On Fri, Jul 03, 2015 at 10:51:52AM +0200, NUNIN Roberto wrote:
> > > > Hi Dan, guys
> > > >
> > > > Sorry for very late follow-up, but we had a lot of other topics to fix just
> > > before to go back on this one.
> > > >
> > > > We have tried another approach just to check if the kernel of the vdsm
> iso
> > > image used to install the host could create the problem I've reported to
> the
> > > list.
> > > >
> > > > Now we have reinstalled the same hardware with latest CentOS 7.1,
> fully
> > > updated.
> > > > Installed vdsm, then joined the oVirt cluster.
> > > >
> > > > Well, we are observing the same behavior as before.
> > > > No DHCP offer is reaching the booting VM, and:
> > > >
> > > > brctl showmacs <bridge_if> show us the booting vm mac-address
> > > > tcpdump -I <bridge_if> show us the dhcp offer coming from dhcp
> server.
> > >
> > > The offer should be replicated to the tap device (vnetXXX). I assume
> > > that it does not?
> >
> > The DHCP offer package coming from DHCP server flows thru the bond0
> > device (tagged), the  VLAN device (tagged) and the bridge interface
> > (not anymore tagged, correct), so it seems that the path back is
> > complete, considering that brctl showmacs shows the vm mac and If we
> > put a static IP into the vm nic, it works correctly.
>
> Let's try to trace the offer for one more link. If it does not get to
> the tap device vnetXXX - it is clearly a host-side issue. Maybe a bridge
> module bug. If you spot the offer on the tap, the it becomes more likely
> that the issue is in qemu or elsewere in the virt stack.
>
> I would appreciate your assistence!
>
> >
> > >
> > > >
> > > > We have also tried to remove ANY firewall rule.
> > > >
> > > > It isn't a PXE issue (gPXE 0.9.7) but only a DHCP process issue. Infact, if
> we
> > > install a vm manually and assign a static IP, it works fine.
> > > > If we switch to dhcp, the vm don't get the dynamic one.
> > > > In this case, tcpdump on vm shows only the DHCP discovery, not the
> DHCP
> > > offer.
> > > >
> > > > Any further suggestion/hint ?
> >
> > We have mode 4, but already checked active/backup, mode 2, without
> changes.
> >
>
> Thanks, so it's not that bonding issue.
>
> Regards,
> Dan.

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