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

[NUNIN Roberto]

> -----Messaggio originale-----
> Da: Dan Kenigsberg [mailto:danken at redhat.com]
> Inviato: martedì 7 luglio 2015 18:13
> A: NUNIN Roberto; mst at redhat.com
> Cc: users at ovirt.org; ibarkan at redhat.com
> Oggetto: Re: R: R: R: R: R: [ovirt-users] R: PXE boot of a VM on vdsm don't read
> DHCP offer
>
> On Tue, Jul 07, 2015 at 10:14:54AM +0200, NUNIN Roberto wrote:
> > >
> > > On Mon, Jul 06, 2015 at 10:33:59AM +0200, NUNIN Roberto wrote:
> > > > 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.
> > >
> > > "vm" is a complicated term.
> > >
> > > `brctl show` would not show you a "vm" connected to a bridge. When you
> > > WOULD see is a vnet888 tap device. The "other side" of this device is
> > > held by qemu, which implement the VM.
> >
> > Ok, understood and found it, vnet2
> >
> > >
> > > I'm asking if the dhcp offer has reached that tap device.
> >
> > No, the DHCP offer packet do not reach the vnet2 interface, I can see only
> DHCP DISCOVER.
>
> Ok, so it seems that we have a problem in the host bridging.
>
> Is it the latest kernel-3.10.0-229.7.2.el7.x86_64 ?

It is 3.10.0-229.7.2.el7.x86_64 on the host with installed Centos7.1, update, then vdsm
It is 3.10.0-123.20.1.el7.x86_64 on the host installed with vdsm iso
Both hosts show the issue
>
> Michael, a DHCP DISCOVER is sent out of a just-booted guest, and OFFER
> returns to the bridge, but is not propagated to the tap device.
> Can you suggest how to debug this further?

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