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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. Either port_id or private_ip is used each time. If you create a rule that applies to all port types, 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 parameters.

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 an ECS or a BMS. This parameter and private_ip are alternative.

For details about how to obtain the port ID of an ECS, see Binding a Virtual IP Address to an ECS NIC. For details about how to obtain the port ID of a BMS, see Querying IP Addresses of BMSs (Native OpenStack API).

private_ip

No

String

Specifies the private IP address, for example, the IP address of a Direct Connect connection. This parameter and port_id are alternative.

internal_service_port

Yes

Integer

Specifies the port used by ECSs or BMSs to provide services for external systems.

The value ranges from 0 to 65535.

floating_ip_id

Yes

String

Specifies the EIP ID. For details about how to obtain the EIP ID, see Querying EIPs.

external_service_port

Yes

Integer

Specifies the port for providing external services.

The value ranges from 0 to 65535.

protocol

Yes

String

Specifies the protocol type. Currently, TCP, UDP, and ANY are supported.

The protocol number of TCP, UDP, and ANY are 6, 17, and 0, respectively.

internal_service_port_range

No

String

Specifies the port range used by ECSs or BMSs to provide services that are accessible from external systems.

  • The number of ports must be the same as that of external _service_port_range.
  • The value ranges from 1 to 65535.
  • Specify two port numbers separated by a single hyphen (-) and no blank spaces in the format, x-y, where x is lower than y.

external_service_port_range

No

String

Specifies the port range used by the floating IP address for providing services that are accessible from external systems.

  • The number of ports must be the same as that of internal _service_port_range.
  • The value ranges from 1 to 65535.
  • Specify two port numbers separated by a single hyphen (-) and no blank spaces in the format, x-y, where x is lower than y.

Response

Table 3 lists response parameters.

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 an ECS or a BMS. This parameter is used in the VPC scenario. This parameter and private_ip are alternative.

private_ip

String

Specifies the private IP address, for example, the IP address of 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 used by ECSs or BMSs to provide services for external systems.

floating_ip_id

String

Specifies the EIP ID.

floating_ip_address

String

Specifies the EIP.

external_service_port

Integer

Specifies the port for providing external services.

protocol

String

Specifies the protocol type. Currently, 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 the unfrozen or frozen state.
  • The value can be:
    • true: indicates the unfrozen state.
    • false: indicates the frozen state.

created_at

String

Specifies when the DNAT rule is created (UTC time). Its value rounds to 6 decimal places for seconds. The format is yyyy-mm-dd hh:mm:ss.

internal_service_port_range

String

Specifies the port range used by ECSs or BMSs to provide services that are accessible from external systems.

  • The number of ports must be the same as that of external _service_port_range.
  • The value ranges from 1 to 65535.
  • Specify two port numbers separated by a single hyphen (-) and no blank spaces in the format, x-y, where x is lower than y.

external_service_port_range

String

Specifies the port range used by the floating IP address for providing services that are accessible from external systems.

  • The number of ports must be the same as that of internal _service_port_range.
  • The value ranges from 1 to 65535.
  • Specify two port numbers separated by a single hyphen (-) and no blank spaces in the format, x-y, where x is lower than y.

Examples

  • Example request
    1. Create a rule for a specified 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
    }
}
    1. Create a rule for all ports. 
      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
    }
}
    2. Create a rule based on the specified port range. 
      POST https://{Endpoint}/v2.0/dnat_rules 
 { 
     "dnat_rule": { 
        "floating_ip_id": "0cc38f0c-f26b-4556-b956-f5831061bb86", 
        "nat_gateway_id": "dcb80bee-3e67-4282-8cc3-981431a63583", 
        "private_ip": "172.16.1.197", 
        "internal_service_port": 0,
        "internal_service_port_range": "55-66",
        "protocol": "udp", 
        "external_service_port": 0,
        "external_service_port_range": "55-66",  
        "description": "my dnat rule 01"
     } 
 }
  • Example response
    1. Create a response for a specified 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": ""
    }
}
    2. Create a response for all ports. 
      {
    "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
    }
}

    3. Create a rule response based on the specified port range.

      {  
      "dnat_rule": {  
          "floating_ip_id": "0cc38f0c-f26b-4556-b956-f5831061bb86",  
          "status": "ACTIVE",  
          "nat_gateway_id": "dcb80bee-3e67-4282-8cc3-981431a63583",  
          "admin_state_up": true,  
          "private_ip": "172.16.1.197",  
          "internal_service_port": 0,  
          "protocol": "udp",  
          "tenant_id": "057ef081ad80d2732fcec011fdbc01c0",  
          "created_at": "2020-09-21 11:46:11.474729",  
          "id": "0de17f1a-686a-4484-9d8b-973889f8654c",  
          "external_service_port": 0,  
          "floating_ip_address": "10.185.74.219", 
          "port_id": "", 
          "internal_service_port_range":"55-66", 
          "external_service_port_range":"55-66" 
      }  
  }

Status Code

See Status Codes.

Parent topic: DNAT Rules