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[Brian Haley <1880845@xxxxxxxxxxxxxxxxxx>]

I think I figured out the issue here, so will close this.

Here's my thinking.

The referenced log above was from a change on stable/train:

  https://review.opendev.org/c/openstack/neutron/+/730888

Lajos fixed a bug in _find_available_ips that seems related:

  https://review.opendev.org/c/openstack/neutron/+/692135

commit 3c9b0a5fac2e3a1321eadc272c8ed46aa61efd3e
Author: elajkat <lajos.katona@xxxxxxxx>
Date:   Wed Oct 30 13:38:30 2019 +0100

    [fullstack] find ip based on allocation_pool
    
    _find_available_ips tried to find available ips based on the given
    subnet's cidr field, which can be misleading if random selection goes
    out-of allocation-pool. This patch changes this behaviour to use
    cidr's allocation_pool field.
    
    Closes-Bug: #1850292
    Change-Id: Ied2ffb5ed58007789b0f5157731687dc2e0b9bb1

That change is only included in these versions:

  master stable/2023.1 stable/2023.2 stable/victoria stable/wallaby stable/xena stable/zed
  unmaintained/victoria unmaintained/wallaby unmaintained/xena unmaintained/yoga

So I'm guessing merged in Victoria.

Since the change was from stable/train we could have had an issue with
the subnet['cidr'] being used, which would have included IP addresses
outside the start/end allocation pool.

** Changed in: neutron
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1880845

Title:
  [fullstack] Error assigning IPv4 (network address) in
  "test_gateway_ip_changed"

Status in neutron:
  Invalid

Bug description:
  Error assigning IPv4 (network address) in "test_gateway_ip_changed".

  LOG:
  https://8e3d76ba7bcafd7367d8-a42dfacf856f2ce428049edff149969f.ssl.cf1.rackcdn.com/730888/1/check/neutron-
  fullstack/31482ea/testr_results.html

  ERROR MESSAGE: http://paste.openstack.org/show/794029/
  """
  neutronclient.common.exceptions.InvalidIpForNetworkClient: IP address 240.135.228.0 is not a valid IP for any of the subnets on the specified network.
  """

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