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
neutron --os-region-name RegionOne subnet-create dup-net2 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

Should it be allowed? Or it's just because it's too difficult to address the 
race condition.

Best Regards
Chaoyi Huang (joehuang)
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