[openstack-dev] [Neutron] Use public IP address as instance fixed IP

Kevin Benton blak111 at gmail.com
Thu Aug 21 20:52:22 UTC 2014

Have you tried making the external network shared as well? Instances that
need a private IP with NAT attach to an internal network and go through the
router like normal. Instances that need a public IP without NAT would just
attach directly to the external network.

On Thu, Aug 21, 2014 at 7:06 AM, Bao Wang <bywang98 at gmail.com> wrote:

> I have a very complex Openstack deployment for NFV. It could not be
> deployed as Flat. It will have a lot of isolated private networks. Some
> interfaces of a group VM instances will need bridged network with their
> fixed IP addresses to communicate with outside world while other interfaces
> from the same set of VM should keep isolated with real private/fixed IP
> addresses. What happen if we use public IP addresses directly as fixed IP
> on those interfaces ? Will this work with Openstack neutron networking ?
> Will Openstack do NAT automatically on those ?
> Overall, the requirement is to use the fixed/public IP to communicate with
> outside directly on some interfaces of some VM instances while keeping
> others as private. The floating IP is not an option here
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Kevin Benton
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