Issue was reproduced on
R720-3-7
2019-11-19_20-00-00


[sysadmin@controller-0 ~(keystone_admin)]$ neutron router-list
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
+--------------------------------------+----------------+----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------+-------+
| id                                   | name           | tenant_id                        | external_gateway_info                                                                                                                                                                     | distributed | ha    |
+--------------------------------------+----------------+----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------------+-------+
| 3f39af1d-e691-48b4-a3a8-49f60da3db4d | tenant1-router | 85403e6228ab40b4b5b30f18ae60c599 | {"network_id": "eb6237df-20e6-42b1-91eb-2c07d61ebb4a", "enable_snat": false, "external_fixed_ips": [{"subnet_id": "de81659f-28bd-46ef-ba8a-3eef4bdfeff9", "ip_address": "192.168.13.2"}]} | False       | False |
| cee41cb9-af1f-4f21-8f37-cd0de52a2621 | tenant2-router | d1a7c6f6aae6407993c2632133e97918 | {"network_id": "eb6237df-20e6-42b1-91eb-2c07d61ebb4a", "enable_snat": false, "external_fixed_ips": [{"subnet_id": "de81659f-28bd-46ef-ba8a-3eef4bdfeff9", "ip_address": "192.168.13.3"}]} | False       | False |
+--------------------------------------+----------------+--


[sysadmin@controller-0 ~(keystone_admin)]$ openstack subnet list | grep external
| de81659f-28bd-46ef-ba8a-3eef4bdfeff9 | external-subnet0      | eb6237df-20e6-42b1-91eb-2c07d61ebb4a | 192.168.13.0/24   |
[sysadmin@controller-0 ~(keystone_admin)]$ openstack subnet show de81659f-28bd-46ef-ba8a-3eef4bdfeff9
+-------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Field             | Value                                                                                                                                                                                       |
+-------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| allocation_pools  | 192.168.13.2-192.168.13.254                                                                                                                                                                 |
| cidr              | 192.168.13.0/24                                                                                                                                                                             |
| created_at        | 2019-11-20T06:40:55Z                                                                                                                                                                        |
| description       |                                                                                                                                                                                             |
| dns_nameservers   |                                                                                                                                                                                             |
| enable_dhcp       | False                                                                                                                                                                                       |
| gateway_ip        | 192.168.13.1                                                                                                                                                                                |
| host_routes       |                                                                                                                                                                                             |
| id                | de81659f-28bd-46ef-ba8a-3eef4bdfeff9                                                                                                                                                        |
| ip_version        | 4                                                                                                                                                                                           |
| ipv6_address_mode | None                                                                                                                                                                                        |
| ipv6_ra_mode      | None                                                                                                                                                                                        |
| location          | Munch({'project': Munch({'domain_name': 'Default', 'domain_id': None, 'name': 'admin', 'id': u'dfdf7afebf62490992697a1bde5b67bf'}), 'cloud': '', 'region_name': 'RegionOne', 'zone': None}) |
| name              | external-subnet0                                                                                                                                                                            |
| network_id        | eb6237df-20e6-42b1-91eb-2c07d61ebb4a                                                                                                                                                        |
| prefix_length     | None                                                                                                                                                                                        |
| project_id        | dfdf7afebf62490992697a1bde5b67bf                                                                                                                                                            |
| revision_number   | 0                                                                                                                                                                                           |
| segment_id        | None                                                                                                                                                                                        |
| service_types     |                                                                                                                                                                                             |
| subnetpool_id     | None                                                                                                                                                                                        |
| tags              |                                                                                                                                                                                             |
| updated_at        | 2019-11-20T06:40:55Z                                                                                                                                                                        |
+-------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+


ppeng@tis-lab-nat-box:~$ ping 192.168.13.2
PING 192.168.13.2 (192.168.13.2) 56(84) bytes of data.
From 192.168.13.1 icmp_seq=1 Destination Host Unreachable
From 192.168.13.1 icmp_seq=2 Destination Host Unreachable