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[Murali krishna <b.murali4@xxxxxxx>]

** Project changed: horizon => neutron

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https://bugs.launchpad.net/bugs/1553968

Title:
   update subnet gateway cause wrong DHCP pool calculation

Status in neutron:
  New

Bug description:
  Description of problem:
  Later updated subnet gateway leads to IP address conflict with DHCP pool range.

  How reproducible:
  100%

  Steps to Reproduce:
  Log in as demo user.
  1. Project - Network - Networks - Create Network
  2. network "test_net", subnet "test_subnet", network address 10.0.0.0/24, IPv4, tick Disable Gateway, Create
  3. click to test_net row, click to Edit Subnet for test_subnet row
  4. untick Disable Gateway, gateway IP 10.0.0.1, Next, leave Allocation Pools unchanged, Save

  Actual results:
  Computed Allocation pools is "10.0.0.1,10.0.0.254", click to Save cause red alert:
  Error: Failed to update subnet "10.0.0.0/24": Gateway ip 10.0.0.1 conflicts with allocation pool 10.0.0.1-10.0.0.254

  Expected results:
  it should exclude the IP of gateway from the DHCP pool, so:
  10.0.0.2,10.0.0.254

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