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[Robert van Leeuwen <Robert.vanLeeuwen@xxxxxxxxxxxxx>]

> Is there a way to create a duplicate network/subnet for tenant in quantum. Basically for a tenant, I want to have 
> some instances(GroupA) share a subnet and another set of instances(GroupB) share the same(duplicate) 
> subnet but GroupA and GroupB should be isolated.

Hi,

You will need to have network namespace support to be able to allow this.
If you have this you can enable this in the quantum.conf: allow_overlapping_ips = True

For the specifics:
http://docs.openstack.org/trunk/openstack-network/admin/content/ch_limitations.html

Cheers,
Robert van Leeuwen