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

Narayanan, Krishnaprasad narayana at uni-mainz.de
Sun Oct 27 16:14:49 UTC 2013


Thanks for your response. I don't see this setting in my nova.conf. Will it be possible for you to describe the complete command of recreating the floating IPs with -interface flag?

From: Oleg Gelbukh [mailto:ogelbukh at mirantis.com]
Sent: Sonntag, 27. Oktober 2013 16:40
To: Narayanan, Krishnaprasad
Cc: openstack at lists.openstack.org
Subject: Re: [Openstack] VMs unable to communicate between each other using their floating IPs


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<mailto: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?


Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
Post to     : openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>
Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack/attachments/20131027/6ec6be0f/attachment.html>

More information about the Openstack mailing list