I tried use wrong gateway and turned off check-box "Public Gateway is Available" at Network Settings. When env starts to deploy we don't get warning message and deployment fails. 
We do not even  reach public_vip_ping.

Actual result: Deployment has failed. All nodes are finished. Failed tasks: Task[netconfig/1], Task[netconfig/3], Task[netconfig/2] Stopping the deployment process!


[root@nailgun ~]# shotgun2 short-report
cat /etc/fuel_build_id:
 495
cat /etc/fuel_build_number:
 495
cat /etc/fuel_release:
 9.0
cat /etc/fuel_openstack_version:
 mitaka-9.0
rpm -qa | egrep 'fuel|astute|network-checker|nailgun|packetary|shotgun':
 python-fuelclient-9.0.0-1.mos356.noarch
 fuel-provisioning-scripts-9.0.0-1.mos8861.noarch
 rubygem-astute-9.0.0-1.mos774.noarch
 fuelmenu-9.0.0-1.mos275.noarch
 python-packetary-9.0.0-1.mos151.noarch
 fuel-bootstrap-cli-9.0.0-1.mos291.noarch
 fuel-setup-9.0.0-1.mos6357.noarch
 shotgun-9.0.0-1.mos90.noarch
 fuel-nailgun-9.0.0-1.mos8861.noarch
 fuel-agent-9.0.0-1.mos291.noarch
 fuel-library9.0-9.0.0-1.mos8605.noarch
 fuel-mirror-9.0.0-1.mos151.noarch
 fuel-ostf-9.0.0-1.mos946.noarch
 nailgun-mcagents-9.0.0-1.mos774.noarch
 fuel-ui-9.0.0-1.mos2814.noarch
 fuel-utils-9.0.0-1.mos8605.noarch
 network-checker-9.0.0-1.mos77.x86_64
 fuel-migrate-9.0.0-1.mos8605.noarch
 fuel-notify-9.0.0-1.mos8605.noarch
 fuel-release-9.0.0-1.mos6357.noarch
 fuel-misc-9.0.0-1.mos8605.noarch
 fuel-9.0.0-1.mos6357.noarch
 fuel-openstack-metadata-9.0.0-1.mos8861.noarch

[root@nailgun ~]# fuel task | tr -s '[:space:]' 
id | status | name | cluster | progress | uuid 
---+--------+------------------------------------+---------+----------+-------------------------------------
1  | ready | dump                    |   | 100 | e54706a3-dac2-4bc9-b860-61a45f28bc4a
9  | ready | check_repo_availability | 1 | 100 | 92dc0b2a-c1c9-4153-8140-9ea22b2d7897
7  | ready | verify_networks         | 1 | 100 | 18484e0e-190b-4aec-a464-fb59e7db58ca
8  | ready | check_dhcp              | 1 | 100 | 1f772db9-65a9-4622-8c32-4f92cda9840a
10 | ready | check_repo_availability_with_setup | 1 | 100 | 58d9ac77-7ab5-4734-90a2-fe9209a66947
20 | ready | node_deletion           | 1 | 100 | c92bcbff-7bc6-4c68-86f7-fd44fcc53440
11 | ready | deploy                  | 1 | 100 | 93fe7dc2-51ae-47c9-8a99-a7f2483569b2
15 | ready | deployment              | 1 | 100 | 7e5babcb-278d-4409-a531-27a96712b7f9
14 | ready | provision               | 1 | 100 | 3f2c8e8f-f981-46f6-8409-84f0580f518c
17 | error | deploy                  | 1 | 100 | f904b6fa-9d9c-4225-a3c8-5c38dd167c2d
21 | error | deployment              | 1 | 100 | ad9636b8-f70e-47b6-b3b7-a9a97e7e5352
22 | ready | check_networks          | 1 | 100 | 3482f03f-1d33-4c60-833a-ceefdb297374
26 | error | deployment              | 1 | 100 | b3402736-937c-4476-906e-8f7e3bb4a0cc
23 | error | deploy                  | 1 | 100 | c4fc9ad5-a2ea-41a8-bc62-158fbd48c2e5


[root@nailgun ~]# fuel2 task history show 21 | grep error | tr -s '[:space:]'
| netconfig | 2 | error | 2016-10-06T15:01:09.768859 | 2016-10-06T15:07:50.984157 |
| netconfig | 1 | error | 2016-10-06T15:01:12.200603 | 2016-10-06T15:08:01.563714 |
| netconfig | 3 | error | 2016-10-06T15:01:13.841846 | 2016-10-06T15:08:05.553554 |

[root@nailgun ~]# fuel2 task history show 21 | grep ping | tr -s '[:space:]' 
| public_vip_ping | 1 | pending | None | None |
| public_vip_ping | 3 | pending | None | None |
| public_vip_ping | 2 | pending | None | None |