# Pastebin kbnFL2Qn
milo@controller:/opt/stack/dragonflow$ neutron subnet-show ext_subnet
+-------------------+--------------------------------------------------+
| Field             | Value                                            |
+-------------------+--------------------------------------------------+
| allocation_pools  | {"start": "192.168.0.2", "end": "192.168.0.200"} |
| cidr              | 192.168.0.0/24                                   |
| dns_nameservers   |                                                  |
| enable_dhcp       | False                                            |
| gateway_ip        | 192.168.0.254                                    |
| host_routes       |                                                  |
| id                | 1cb57c6a-3f09-4aec-bebe-a51783641808             |
| ip_version        | 4                                                |
| ipv6_address_mode |                                                  |
| ipv6_ra_mode      |                                                  |
| name              | ext_subnet                                       |
| network_id        | bd421df7-854d-4bbc-b7a8-3a16a4a95422             |
| subnetpool_id     |                                                  |
| tenant_id         | 141df7df0ea94899ba8e0e81edbd2b3d                 |
+-------------------+--------------------------------------------------+
milo@controller:/opt/stack/dragonflow$ neutron subnet-update ext_subnet --gateway_ip=192.168.0.1
Updated subnet: ext_subnet
milo@controller:/opt/stack/dragonflow$ neutron subnet-show ext_subnet                                                                                                                                                                       
+-------------------+--------------------------------------------------+
| Field             | Value                                            |
+-------------------+--------------------------------------------------+
| allocation_pools  | {"start": "192.168.0.2", "end": "192.168.0.200"} |
| cidr              | 192.168.0.0/24                                   |
| dns_nameservers   |                                                  |
| enable_dhcp       | False                                            |
| gateway_ip        | 192.168.0.1                                      |
| host_routes       |                                                  |
| id                | 1cb57c6a-3f09-4aec-bebe-a51783641808             |
| ip_version        | 4                                                |
| ipv6_address_mode |                                                  |
| ipv6_ra_mode      |                                                  |
| name              | ext_subnet                                       |
| network_id        | bd421df7-854d-4bbc-b7a8-3a16a4a95422             |
| subnetpool_id     |                                                  |
| tenant_id         | 141df7df0ea94899ba8e0e81edbd2b3d                 |
+-------------------+--------------------------------------------------+