# ModifyDnatEntry

## 1. API Description

This API (ModifyDnatEntry) is used to modify a DNAT rule.

## 2. Input Parameters

The following request parameter list only provides API request parameters.

| Parameter Name | Required | Type                                                                                                         | Description                                                                                    |
| -------------- | -------- | ------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------- |
| dnatEntryId    | Yes      | String                                                                                                       | DNAT entry ID.                                                                                 |
| eipId          | Yes      | String                                                                                                       | The elastic IP ID configured in the DNAT rule.                                                 |
| privateIp      | Yes      | String                                                                                                       | The private IP address configured in the DNAT rule.                                            |
| protocol       | Yes      | [DnatEntryProtocol](https://docs.console.zenlayer.com/api-reference/compute/datastructure#dnatentryprotocol) | The protocol type configured in the DNAT rule.                                                 |
| listenerPort   | No       | String                                                                                                       | <p>The public port or port range forwarded by the DNAT rule.</p><p>Valid values: 1–65535.</p>  |
| internalPort   | No       | String                                                                                                       | <p>The private port or port range forwarded by the DNAT rule.</p><p>Valid values: 1–65535.</p> |

## 3. Output Parameters

| Parameter Name | Type   | Description                                                                                                           |
| -------------- | ------ | --------------------------------------------------------------------------------------------------------------------- |
| requestId      | String | <p>The unique request ID, which is returned for each request.</p><p>RequestId is required for locating a problem.</p> |

## 4. Code Example

{% tabs %}
{% tab title="Example" %}
**Modify a DNAT entry.**

```json
POST /api/v2/zec HTTP/1.1
Host: console.zenlayer.com
Content-Type: application/json
X-ZC-Action: ModifyDnatEntry
<Common Request Params>

Request：
{
    "dnatEntryId": "<dnatEntryId>",
    "eipId": "<eipId>",
    "privateIp": "10.0.0.2",
    "protocol": "TCP",
    "listenerPort": "1-30",
    "internalPort": "1-30"
}

Response：
{
  "requestId": "T05992D0C-7E8B-4047-B0C0-780F2CD549D3",
  "response": {
    "requestId": "T05992D0C-7E8B-4047-B0C0-780F2CD549D3"
  }
}
```

{% endtab %}
{% endtabs %}

## 5. Developer Resources

Zenlayer Cloud API 2.0 integrates [SDKs](https://docs.console.zenlayer.com/api-reference/api-introduction/toolkit/api-sdk)，to make it easier for you to call APIs. More programming languages will be supported.

## 6. Error Codes

The following only lists the error codes related to the API business logic. For other error codes, see [Common Error Codes](https://docs.console.zenlayer.com/api-reference/api-introduction/instruction/commonerrorcode).

| HTTP Status Code | Error Code                               | Description                                       |
| ---------------- | ---------------------------------------- | ------------------------------------------------- |
| 404              | INVALID\_DNAT\_ENTRY\_NOT\_FOUND         | DNAT entry does not exist.                        |
| 404              | INVALID\_NAT\_NOT\_FOUND                 | NAT gateway does not exist.                       |
| 400              | OPERATION\_DENIED\_NAT\_STATUS           | NAT gateway state is not RUNNING.                 |
| 404              | INVALID\_EIP\_NOT\_FOUND                 | Elastic IP does not exist.                        |
| 400              | OPERATION\_DENIED\_EIP\_NOT\_ASSIGNED    | Elastic IP is not bound.                          |
| 400              | OPERATION\_DENIED\_EIP\_NOT\_ASSIGN\_NAT | The elastic IP isn't assigned to the NAT gateway. |