Updated on 2025-12-25 GMT+08:00

Adding an SNAT Rule

Function

This API is used to add an SNAT rule.

Constraints

You can create an SNAT rule only when status of the NAT gateway is ACTIVE and admin_state_up of the NAT gateway administrator is True.

Calling Method

For details, see Calling APIs.

Authorization Information

Each account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions.

  • If you are using role/policy-based authorization, see Permissions Policies and Supported Actions for details on the required permissions.
  • If you are using identity policy-based authorization, the following identity policy-based permissions are required.

    Action

    Access Level

    Resource Type (*: required)

    Condition Key

    Alias

    Dependencies

    nat:snatRules:create

    Write

    gateway *

    g:ResourceTag/<tag-key>

    -

    eip:publicIps:associateInstance

    snatRule *

    -

    publicip

    -

    globalEip

    -

    subnet

    -

    -

    g:EnterpriseProjectId

URI

POST /v2/{project_id}/snat_rules

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Specifies the project ID.

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

Specifies the user token.

It is a response to the API for obtaining a user token. This API is the only one that does not require authentication.

The value of X-Subject-Token in the response header is the token value.

Table 3 Request body parameters

Parameter

Mandatory

Type

Description

snat_rule

Yes

CreateNatGatewaySnatRuleOption object

Specifies the request body for creating the SNAT rule.

Table 4 CreateNatGatewaySnatRuleOption

Parameter

Mandatory

Type

Description

nat_gateway_id

Yes

String

Specifies the public NAT gateway ID.

cidr

No

String

Specifies a CIDR block or a host IP address. Configure either cidr or network_id.

If you set source_type to 0, set cidr to a subset of the VPC subnet.

If you set source_type to 1, set cidr to a CIDR block of your private networks connected to the VPC through Direct Connect or Cloud Connect.

network_id

No

String

Specifies the network ID used by the SNAT rule. Configure either network_id or cidr.

description

No

String

Provides supplementary information about the SNAT rule. The description can contain up to 255 characters and cannot contain angle brackets (<>).

source_type

No

Integer

Specifies the resource type.

The value can be:

  • 0: VPC. Either network_id or cidr can be specified.

  • 1: Direct Connect/Cloud Connect. Only cidr can be specified.

If no value is entered, default value 0 (VPC) is used.

floating_ip_id

Yes

String

Specifies the EIP ID. Use commas (,) to separate multiple EIP IDs.

Maximum number of EIP IDs: 20

global_eip_id

No

String

Specifies the global EIP ID.

Response Parameters

Status code: 201

Table 5 Response body parameters

Parameter

Type

Description

snat_rule

CreateNatGatewaySnatRuleResponseBody object

Specifies the response body for creating the SNAT rule.

Table 6 CreateNatGatewaySnatRuleResponseBody

Parameter

Type

Description

id

String

Specifies the SNAT rule ID.

tenant_id

String

Specifies the project ID.

nat_gateway_id

String

Specifies the public NAT gateway ID.

cidr

String

Specifies a CIDR block or a host IP address. Configure either cidr or network_id.

If you set source_type to 0, set cidr to a subset of the VPC subnet.

If you set source_type to 1, set cidr to a CIDR block of your private networks connected to the VPC through Direct Connect or Cloud Connect.

source_type

Integer

Specifies the resource type.

The value can be:

  • 0: VPC. Either network_id or cidr can be specified.

  • 1: Direct Connect/Cloud Connect. Only cidr can be specified.

If no value is entered, default value 0 (VPC) is used.

floating_ip_id

String

Specifies the EIP ID. Use commas (,) to separate multiple EIP IDs.

global_eip_id

String

Specifies the global EIP ID. Use commas (,) to separate multiple global EIP IDs. Configure either the EIP ID or the global EIP ID.

The maximum length is 4,096 bytes.

description

String

Provides supplementary information about the SNAT rule. The description can contain up to 255 characters and cannot contain angle brackets (<>).

status

String

Specifies the SNAT rule status.

The value can be:

  • ACTIVE: The SNAT rule is available.

  • PENDING_CREATE: The SNAT rule is being created.

  • PENDING_UPDATE: The SNAT rule is being updated.

  • PENDING_DELETE: The SNAT rule is being deleted.

  • EIP_FREEZED: The EIP is frozen.

  • INACTIVE: The SNAT rule is unavailable.

created_at

String

Specifies when the SNAT rule was created. The time is in yyyy-mm-dd hh:mm:ss.SSSSSS format.

network_id

String

Specifies the network ID used by the SNAT rule. Configure either network_id or cidr.

admin_state_up

Boolean

Specifies whether the SNAT rule is frozen.

The value can be:

  • true: The SNAT rule is unfrozen.

  • false: The SNAT rule is frozen.

floating_ip_address

String

Specifies the EIP. Use commas (,) to separate multiple EIPs.

global_eip_address

String

Specifies the global EIP.

Example Requests

Adding an SNAT rule

POST https://{NAT_endpoint}/v2/d199ba7e0ba64899b2e81518104b1526/snat_rules

{
  "snat_rule" : {
    "nat_gateway_id" : "a78fb3eb-1654-4710-8742-3fc49d5f04f8",
    "cidr" : "172.30.0.0/24",
    "source_type" : 1,
    "floating_ip_id" : "bdc10a4c-d81a-41ec-adf7-de857f7c812a",
    "description" : "my snat rule 01"
  }
}

Example Responses

Status code: 201

SNAT rule added.

{
  "snat_rule" : {
    "floating_ip_id" : "bdc10a4c-d81a-41ec-adf7-de857f7c812a",
    "status" : "PENDING_CREATE",
    "nat_gateway_id" : "a78fb3eb-1654-4710-8742-3fc49d5f04f8",
    "admin_state_up" : true,
    "cidr" : "172.30.0.0/24",
    "description" : "",
    "source_type" : 1,
    "tenant_id" : "27e25061336f4af590faeabeb7fcd9a3",
    "created_at" : "2017-11-18 07:54:21.665430",
    "id" : "5b95c675-69c2-4656-ba06-58ff72e1d338",
    "floating_ip_address" : "5.21.11.226"
  }
}

SDK Sample Code

The SDK sample code is as follows.

Java

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.nat.v2.region.NatRegion;
import com.huaweicloud.sdk.nat.v2.*;
import com.huaweicloud.sdk.nat.v2.model.*;


public class CreateNatGatewaySnatRuleSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        NatClient client = NatClient.newBuilder()
                .withCredential(auth)
                .withRegion(NatRegion.valueOf("<YOUR REGION>"))
                .build();
        CreateNatGatewaySnatRuleRequest request = new CreateNatGatewaySnatRuleRequest();
        CreateNatGatewaySnatRuleRequestOption body = new CreateNatGatewaySnatRuleRequestOption();
        CreateNatGatewaySnatRuleOption snatRulebody = new CreateNatGatewaySnatRuleOption();
        snatRulebody.withNatGatewayId("a78fb3eb-1654-4710-8742-3fc49d5f04f8")
            .withCidr("172.30.0.0/24")
            .withDescription("my snat rule 01")
            .withSourceType(1)
            .withFloatingIpId("bdc10a4c-d81a-41ec-adf7-de857f7c812a");
        body.withSnatRule(snatRulebody);
        request.withBody(body);
        try {
            CreateNatGatewaySnatRuleResponse response = client.createNatGatewaySnatRule(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

Python

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdknat.v2.region.nat_region import NatRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdknat.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = NatClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(NatRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = CreateNatGatewaySnatRuleRequest()
        snatRulebody = CreateNatGatewaySnatRuleOption(
            nat_gateway_id="a78fb3eb-1654-4710-8742-3fc49d5f04f8",
            cidr="172.30.0.0/24",
            description="my snat rule 01",
            source_type=1,
            floating_ip_id="bdc10a4c-d81a-41ec-adf7-de857f7c812a"
        )
        request.body = CreateNatGatewaySnatRuleRequestOption(
            snat_rule=snatRulebody
        )
        response = client.create_nat_gateway_snat_rule(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Go

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    nat "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/nat/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/nat/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/nat/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := nat.NewNatClient(
        nat.NatClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.CreateNatGatewaySnatRuleRequest{}
	cidrSnatRule:= "172.30.0.0/24"
	descriptionSnatRule:= "my snat rule 01"
	sourceTypeSnatRule:= int32(1)
	snatRulebody := &model.CreateNatGatewaySnatRuleOption{
		NatGatewayId: "a78fb3eb-1654-4710-8742-3fc49d5f04f8",
		Cidr: &cidrSnatRule,
		Description: &descriptionSnatRule,
		SourceType: &sourceTypeSnatRule,
		FloatingIpId: "bdc10a4c-d81a-41ec-adf7-de857f7c812a",
	}
	request.Body = &model.CreateNatGatewaySnatRuleRequestOption{
		SnatRule: snatRulebody,
	}
	response, err := client.CreateNatGatewaySnatRule(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

More

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Codes

Status Code

Description

201

SNAT rule added.

Error Codes

See Error Codes.