[Openstack] VMs unable to communicate between each other using their floating IPs

Oleg Gelbukh ogelbukh at mirantis.com
Sun Oct 27 15:40:26 UTC 2013


Are you using multi-host? Is 'public_interface' in your nova.conf set?

Recently we've had similar situation with a customer. Turned out that
traffic going from VM's fixed IP to floating IP of another VM on the same
physical host never gets to public interface and thus never SNATed, and
response never gets back.

We fixed it by unsetting 'public_interface' and re-creating floating IPs
with --interface=<public_interface> flag. It ensures that all packets from
VMs are source-translated, and also that floating IPs are assigned to
correct interface.

Hope that helps.

Best regards,
Oleg Gelbukh
Mirantis Labs

On Fri, Oct 25, 2013 at 11:41 PM, Narayanan, Krishnaprasad <
narayana at uni-mainz.de> wrote:

>  Hi all,****
> ** **
> Im my OpenStack setup, i am using nova-network to manage the networks. I
> could see that the VMs are unable to communicate between each other via
> their floating IPs.****
> ** **
> Can I know what is the reason and how to get rid of the problem?****
> ** **
> Thanks,****
> Krishnaprasad****
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