Creating a DNAT Rule

Function

This API is used to create a DNAT rule.

You can create a DNAT rule only when status of the NAT gateway is set to ACTIVE and admin_state_up of the NAT gateway administrator to True. Specify either port_id or private_ip at a time. If you are going to create a DNAT rule that allows traffic to and from all ports of a server and an EIP, set internal_service_port to 0, external_service_port to 0, and protocol to any.

URI

POST /v2.0/dnat_rules

Request

Table 1 lists the request parameter.

**Table 1** Request parameter
Parameter	Mandatory	Type	Description
dnat_rule	Yes	Object	Specifies the DNAT rule object. For details, see Table 2.

**Table 2** Description of the **dnat_rule** field
Parameter	Mandatory	Type	Description
nat_gateway_id	Yes	String	Specifies the NAT gateway ID.
port_id	No	String	Specifies the port ID of the cloud server (ECS or BMS). Either this parameter or private_ip must be specified.
private_ip	No	String	Specifies the private IP address, for example, the IP address of an on-premises network connected by a Direct Connect connection. This parameter and port_id are alternative.
internal_service_port	Yes	Integer	Specifies the port number used by the cloud server (ECS or BMS) to provide services for external systems. The value ranges from 0 to 65535.
floating_ip_id	Yes	String	Specifies the EIP ID.
external_service_port	Yes	Integer	Specifies the port for providing services for external systems. The value ranges from 0 to 65535.
protocol	Yes	String	Specifies the protocol. TCP, UDP, and ANY are supported. The protocol number of TCP, UDP, and ANY are 6, 17, and 0, respectively.

Response

Table 3 lists response parameter.

**Table 3** Response parameter
Parameter	Type	Description
dnat_rule	Object	Specifies the DNAT rule object. For details, see Table 4.

**Table 4** Description of the **dnat_rule** field
Parameter	Type	Description
id	String	Specifies the DNAT rule ID.
tenant_id	String	Specifies the project ID.
nat_gateway_id	String	Specifies the NAT gateway ID.
port_id	String	Specifies the port ID of the cloud server (ECS or BMS). This parameter is used in the VPC scenario, where this parameter or private_ip must be specified.
private_ip	String	Specifies the IP address of an on-premises network connected by a Direct Connect connection. This parameter is used in the Direct Connect scenario. This parameter and port_id are alternative.
internal_service_port	Integer	Specifies the port number used by the cloud server (ECS or BMS) to provide services for external systems.
floating_ip_id	String	Specifies the EIP ID.
floating_ip_address	String	Specifies the EIP address.
external_service_port	Integer	Specifies the port for providing services for external systems.
protocol	String	Specifies the protocol. TCP, UDP, and ANY are supported. The protocol number of TCP, UDP, and ANY are 6, 17, and 0, respectively.
status	String	Specifies the status of the DNAT rule. For details about all its values, see Table 1.
admin_state_up	Boolean	Specifies whether the NAT gateway is up or down. The value can be: true: The DNAT rule is enabled. false: The DNAT rule is disabled.
created_at	String	Specifies when the DNAT rule was created (UTC time). Its value rounds to 6 decimal places for seconds. The format is yyyy-mm-dd hh:mm:ss.

Examples

Example requests

Creating a DNAT rule with specified internal_service_port and external_service_port

POST https://{Endpoint}/v2.0/dnat_rules
{
    "dnat_rule": {
        "floating_ip_id": "bf99c679-9f41-4dac-8513-9c9228e713e1",
        "nat_gateway_id": "cda3a125-2406-456c-a11f-598e10578541",
        "port_id": "9a469561-daac-4c94-88f5-39366e5ea193",
        "internal_service_port": 993,
        "protocol": "tcp",
        "external_service_port": 242
    }
}

Creating a DNAT rule with both internal_service_port and external_service_port set to 0

POST https://{Endpoint}/v2.0/dnat_rules
{
    "dnat_rule": {
        "floating_ip_id": "Cf99c679-9f41-4dac-8513-9c9228e713e1",
        "nat_gateway_id": "Dda3a125-2406-456c-a11f-598e10578541",
        "private_ip": "192.168.1.100",
        "internal_service_port": 0,
        "protocol": "any",
        "external_service_port": 0
    }
}

Example responses

Response to the request for creating a DNAT rule with specified internal_service_port and external_service_port

{
    "dnat_rule": {
        "floating_ip_id": "bf99c679-9f41-4dac-8513-9c9228e713e1",
        "status": "ACTIVE",
        "nat_gateway_id": "cda3a125-2406-456c-a11f-598e10578541",
        "admin_state_up": true,
        "port_id": "9a469561-daac-4c94-88f5-39366e5ea193",
        "internal_service_port": 993,
        "protocol": "tcp",
        "tenant_id": "abc",
        "created_at": "2017-11-15 15:44:42.595173",
        "id": "79195d50-0271-41f1-bded-4c089b2502ff",
        "floating_ip_address": "5.21.11.226",
        "external_service_port": 242,
        "private_ip": ""
    }
}

Response to the request for creating a DNAT rule with both internal_service_port and external_service_port set to 0

{
    "dnat_rule": {
        "floating_ip_id": "cf99c679-9f41-4dac-8513-9c9228e713e1",
        "status": "ACTIVE",
        "nat_gateway_id": "dda3a125-2406-456c-a11f-598e10578541",
        "admin_state_up": true,
        "private_ip": "192.168.1.100",
        "internal_service_port": 0,
        "protocol": "any",
        "tenant_id": "abc",
        "created_at": "2017-11-15 15:44:42.595173",
        "id": "79195d50-0271-41f1-bded-4c089b2502ff",
        "floating_ip_address": "5.21.11.227",
        "external_service_port": 0
    }
}