By default, when a gateway is attached to a router using the Neutron L3 extension, Network Address Translation (NAT) is enabled for traffic generated by subnets attached to the router. With this extension, the user will have the option of choosing whether SNAT should be enabled or not on a router basis.
This is achieved simply by specifying a boolean attribute,
enable_snat, in the
external_gateway_info attribute of the
router resource.
This extension redefines the external_gateway_info attribute as depicted in the following table.
| Attribute | Type | Required | Default Value | Validation Constraints | Notes |
|---|---|---|---|---|---|
| network_id | UUID | Yes | N/A | Must be a valid uuid representative of an external network. | |
| enable_snat | Boolean | No | True | {True|False} | The default setting is True to
ensure backward compatibility for plugins
supporting this extension. |
SNAT can be enabled or disabled at any time on a Neutron router regardless of the current status of floating IPs. Floating IPs will continue working even when SNAT is disabled.
