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

[Dan Kenigsberg]

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?

> 
> 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 ?

Which bond mode are you using? I recently seen

    https://bugzilla.redhat.com/show_bug.cgi?id=1230638#c22

closed as duplicate of

    Bug 1094842 - Bonding modes 0, 5 and 6 should be avoided for VM
    networks