[Openstack-operators] VMs on different compute hosts are not able to communicate on openstack havana, with flatdhcp, multi-host nova-network setup with kvm on ubuntu 12.04

Erik McCormick emccormick at cirrusseven.com
Thu Dec 26 16:40:50 UTC 2013

I haven't tried a setup using nova network, but when I attempted a setup
with Neutron in VMWare, I had the same arp issues. When I put everything on
physical hosts except the control node, my issues went away. I don't know
the exact cause of the issue, but it seems to have something to do with the
VMWare virtual switch.

On Dec 26, 2013 8:48 AM, "Harish Kumar" <hk4cloud at gmail.com> wrote:

> Hello All,
> I am trying to setup openstack with zeromq, with flatdhcp multi-host
> networking with nova-network, with kvm hypervisor on ubuntu 12.04.
> The problem we are facing is that the vms running on different compute
> hosts are not able to communicate between them; at the same time, vms on
> same host are able to communicate.
> I see when I ping from vm1 running on compute1 to vm2 running on compute2,
> the arp request broadcast is reaching vm2 and is replying which is reaching
> compute2 bridge interface (br100 and corresponding eth interface), but the
> reply is not reaching to compute1 bridge interface.
> I am setting up the whole setup in vmware workstation environment.
> Any help is greatly appreciated..... :)
> Thanks,
> Harry
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> OpenStack-operators at lists.openstack.org
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