Comment 2 for bug 1226666

Well like i said and according the specification from here : https://wiki.openstack.org/wiki/Neutron/APIv2-specification and i quote:

... If the parameter for the gateway address, gateway_ip is not specified, then Quantum will allocate an address from the subnet's cidr for the subnet's gateway. In order to specify a subnet without a gateway, users should specify the value null for the gateway_ip attribute in the request body. ...

So to answer your question:

- user specifies no gateway_ip: The subnet **will** have a gateway ip chose by Neutron.
- user specifies 'null' for gateway_ip: The subnet will **not** have a gateway ip.

Cheers,