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[Ihar Hrachyshka <1598171@xxxxxxxxxxxxxxxxxx>]

** Tags removed: neutron router-gateway-set router-update snat

** Project changed: neutron => python-neutronclient

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https://bugs.launchpad.net/bugs/1598171

Title:
  neutron router-gateway-set --enable-snat fails

Status in python-neutronclient:
  Fix Released

Bug description:
  I have a Mitaka environment with 1 control node and 3 compute nodes,
  all physical machines running on openSUSE Leap 42.1.

  My version of neutron client:

  ---cut here---
  control1:~ # rpm -qi python-neutronclient-3.1.1-1.1.noarch
  Name        : python-neutronclient
  Version     : 3.1.1
  Release     : 1.1
  Architecture: noarch
  Install Date: Mo 11 Apr 2016 12:13:44 CEST
  Group       : Development/Languages/Python
  Size        : 2079132
  License     : Apache-2.0
  Signature   : RSA/SHA1, Do 03 Mär 2016 16:46:07 CET, Key ID 893a90dad85f9316
  Source RPM  : python-neutronclient-3.1.1-1.1.src.rpm
  Build Date  : Do 03 Mär 2016 16:45:27 CET
  Build Host  : cloud118
  Relocations : (not relocatable)
  Vendor      : obs://build.opensuse.org/Cloud:OpenStack
  URL         : http://launchpad.net/python-neutronclient
  Summary     : Openstack Network (Quantum) API Client
  ---cut here---

  Changing the router property "enable_snat" works only in one direction. The resource description in Horizon for "resource_types/OS::Neutron::Router/" says:
      enable_snat: {description: 'Enables Source [...] update_allowed: true}
  So trying to update this property in CLI (as project admin) seems to work:

  control1:~ # neutron router-gateway-set --enable-snat <ROUTER_ID> <NETWORK_ID>
  Set gateway for router cbc39730-34cc-4d18-986a-5b6b9b1b4e96

  But actually no change has been made:
  control1:~ # neutron router-list
  +----------------+------------+-------------------------------------------------+
  | id             | name       | external_gateway_info                           |
  +----------------+------------+-------------------------------------------------+
  | cbc39730...    | router01   | {"network_id": "ID", "enable_snat": false, [...]|
  +----------------+------------+-------------------------------------------------+

  I know there's no such option in the help page for router-gateway-set
  command, but if there's not I'd expect an error message. Or if it's a
  valid option it should actually change this property.

  Steps to reproduce:
  1. Create a router with snat disabled
  2. Try to enable snat via command line

  Expected output:
  Along with the success message ("Set gateway for router...") it should either actually enable snat or throw an error message ("unknown option" or something similar).

  Actual output:
  Success message saying router-gateway has been set, but the argument "--enable-snat" is ignored, no changes have been applied.

  I will be out of office for the next three weeks, I'll set my co-
  worker in cc to this bug. If there are any questions on this issue he
  will try to answer them.

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