Yes, it uses the lowest for the gateway, I was using ".1" to denote this but realize it might not have been the best example. I'm testing a patch now to remove the '--gateway a.b.c.d' if it's not explicitly set since it isn't necessary.

-Brian

On 08/22/2016 01:57 PM, Brent Troge wrote:
Doesn't neutron use the first available host address in the subnet as the
gateway? So if your cidr is 128/25 then neutron would default to 129 as the
gateway.


On Aug 22, 2016 9:54 AM, "Brian Haley" <brian.ha...@hpe.com
<mailto:brian.ha...@hpe.com>> wrote:

    On 08/21/2016 08:40 PM, Tony Breeds wrote:

        On Sun, Aug 21, 2016 at 05:28:44PM +0530, Akilesh K wrote:

            Hi,
            I am using devstack for the first time and I see that it has 
created a
            subnet like below. The cidr and gateway do not match. Because of 
this
            devstack fails to run completely and fails while attaching a router
            to this
            subnet. Why is devstack doing this??


        You also need to specify NETWORK_GATEWAY in your local.conf:
            NETWORK_GATEWAY=10.4.128.1
        should match:
            FIXED_RANGE=10.4.128.0/20 <http://10.4.128.0/20>

        Our docs need updating as we recently switched from nova to neutron as 
the
        default network provider.


    What devstack should really be doing is defaulting the gateway to "",
    neutron will automatically use the ".1" of the subnet for the gateway if not
    told otherwise.

    I'll try and get a quick patch out today.

    -Brian

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