O, it's being set to "True" in devstack installation. Thanks for clarification. Best Regards Chaoyi Huang (joehuang) ________________________________ From: Kevin Benton [kevin at benton.pub] Sent: 14 February 2017 12:17 To: OpenStack Development Mailing List (not for usage questions) Subject: Re: [openstack-dev] [neutron]CIDR overlapping Do you have allow_overlapping_ips set to True? On Mon, Feb 13, 2017 at 7:56 PM, joehuang <joehuang at huawei.com<mailto:joehuang at huawei.com>> wrote: Hello, During the regression test, I find that Neutron allows CIDR overlapping in same project. neutron --os-region-name RegionOne net-create dup-net1 neutron --os-region-name RegionOne net-create dup-net2 neutron --os-region-name RegionOne subnet-create dup-net1 20.0.1.0/24<http://20.0.1.0/24> neutron --os-region-name RegionOne subnet-create dup-net2 20.0.1.0/24<http://20.0.1.0/24> all commands can be executed successfully, and after then the project has two subnets with same CIDR: 20.0.1.0/24<http://20.0.1.0/24> Should it be allowed? Or it's just because it's too difficult to address the race condition. Best Regards Chaoyi Huang (joehuang) __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: OpenStack-dev-request at lists.openstack.org?subject:unsubscribe<http://OpenStack-dev-request@lists.openstack.org?subject:unsubscribe> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20170214/d0b68b23/attachment.html>