[Openstack-operators] [Neutron] public and private fixed IPs

James Denton james.denton at rackspace.com
Sun Oct 25 05:45:26 UTC 2015

Hi Adam,

If you're asking whether or not a VM can be attached to an 'external' network so that the 'public' ip is the fixed IP of them VM, then yes. A Neutron router can also be attached to the same network so that instances in non-routable tenant networks can obtain floating IPs from the same 'public' network. At one time non-admin users were not allowed to attach VMs to 'external' networks but I believe that restriction was removed around Kilo or so. 


Sent from my iPhone

> On Oct 25, 2015, at 2:15 PM, Adam Lawson <alawson at aqorn.com> wrote:
> Hi everyone!
> When using KVM, does Neutron support binding a public routable address
> to one VM in one tenant as a fixed IP that is accessible outside the
> cloud (no floating IP for remote access) and a VM in a separate tenant
> with private fixed IP's with optional floating IP? Would this be
> possible on a per tenant or per region basis?
> I'm working on a cloud approach that allows either scenario.
> Long story short, I'm trying to support two options in the same cloud
> (if possible) so a department/tenant can deploy instances with public
> IP's that are directly accessible by the rest of the enterprise (no
> NAT) and a second department/tenant that deploys all of their VM's
> within the context of a private/isolated tenant network with optional
> floating IP's.
> Thoughts on how this would be handled? Is it as simple as assigning a
> public subnet to a tenant as the fixed/tenant network?
> //adam
> -- 
> *Adam Lawson*
> AQORN, Inc.
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