[openstack-dev] [neutron]

Brian Haley haleyb.dev at gmail.com
Wed Jan 23 20:46:11 UTC 2019

On 1/22/19 1:56 PM, Farhad Sunavala wrote:
> Hi,
> I am open to suggestions.
> We have a need to switch traffic from our project to other projects 
> without first getting out
> on the internet, floating IPs, etc.
> The other projects will be sharing their networks with our project.
> As shown in figure below, the orange network belongs to our project 
> (
> The green network ( belongs to another project
> and
> has an overlapping network with the red tenant (
> For now, the solution is to create VMs in our project and make sure none 
> of the interfaces
> having overlapping CIDRs.  Thus, there is a VM attached to the 'orange' 
> and 'red' nets
> and another VM attached to the 'orange' and 'green' nets.
> Problem: Too much resources (VMs) will need to be created if we have 100 
> tenants with overlapping networks.
> Solution:
> Is there a way I can minimize VM resource in our project by not 
> allocating a separate VM
> for shared networks with overlapping CIDRs?

Have you tried setting allow_overlapping_ips=False in neutron.conf and 
restarting the server?


More information about the openstack-discuss mailing list