[openstack-dev] [neutron]CIDR overlapping

joehuang joehuang at huawei.com
Tue Feb 14 02:56:59 UTC 2017


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

all commands can be executed successfully, and after then the project has two subnets with same CIDR:

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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