您在购买公网 IP 实例时，可以将 EIP 资源绑定到已有的 DDoS 原生防护实例上，快速为实例添加防护。本文为您介绍如何通过 API 调用实现 DDoS 原生防护实例的购买和公网 IP 的绑定。

步骤一：购买原生防护实例

您可以参考PurchaseInstanceInOneStep-购买原生防护实例，购买符合您实际需求的 DDoS 原生防护实例。购买前，请确保您的账户余额充足。
例如，通过以下请求在华北2（北京）地域创建一个 DDoS 原生防护企业版实例。

POST https://open.volcengineapi.com/?Action=PurchaseInstanceInOneStep&Version=2022-01-01
X-Date: 20230711T035055Z
Authorization: HMAC-SHA256 Credential=AKLTNGU0OGEyMT***/20230711/cn-beijing/origin_defence/request, SignedHeaders=content-type;x-content-sha256;x-date, Signature=da4fac562d00f41ad8***
{
    "DefBand": 300,
    "IpNum": 10,
    "BizBand": 100,
    "ElaBand": 500,
    "PurchaseNum": 1,
    "MonthNum": 12,
    "AutoRenew": "on",
    "AccessMode": 2,
    "BandwidthType": 1,
    "Region": "cn-beijing",
    "Spec": "Enterprise",
}

步骤二：查询原生防护实例 ID

由于 EIP 通过 DDoS 原生防护实例的 ID 完成绑定，因此需要先获取对应实例的 ID。您可以调用DescInstanceList-查询原生防护实例列表，直接查询已创建的防护实例信息。

请求示例

GET https://open.volcengineapi.com/?Action=DescInstanceList&Version=2022-01-01
X-Date: 20230711T035055Z
Authorization: HMAC-SHA256 Credential=AKLTNGU0OGEyMT***/20230711/cn-beijing/origin_defence/request, SignedHeaders=content-type;x-content-sha256;x-date, Signature=da4fac562d00f41ad8***

返回示例

以下返回示例中可以得出，名称为ddos-test1的实例对应的 ID 为20。

{
    "ResponseMetadata": {
        "RequestId": "202311162124068D795C2273F41FA0****",
        "Action": "DescInstanceList",
        "Version": "2022-01-01",
        "Service": "origin_defence",
        "Region": "cn-beijing"
    },
    "Result": {
        "InsList": [
            {
                "Id": 20,
                "AttackCount": 0,
                "AutoRenew": true,
                "DefBand": 300,
                "ElaBand": 500,
                "UsedIpNum": 2,
                "IpNum": 10,
                "BizBand": 50,
                "Name": "ddos-test1",
                "PeakAttackBand": 0,
                "Status": 1,
                "StartAt": 1681462614,
                "StopAt": 1702569599,
                "Region": "cn-beijing",
                "Spec": "Enterprise",
                "ElaBandStatus": 1,
                "IsDemoted": false
            }
        ]
    },
    "PageInfo": {
        "TotalCount": 2,
        "PageSize": 10,
        "CurrentPage": 1,
        "Count": 2
    }
}

步骤三：购买 EIP 实例时绑定 DDoS 原生防护实例

如果您希望在购买 EIP 实例时，直接绑定步骤二中 ID 为20的实例，在申请公网 IP 时将SecurityProtectionInstanceId参数的值设置为20即可。更多 EIP 购买操作，可参考 EIP 的接口调用说明AllocateEipAddress。

（可选）步骤四：查看防护实例的攻击事件列表信息

在 EIP 与原生防护实例绑定一段时间后，您可以参考DescAttackEvent-查询攻击事件列表，查看相关资产的攻击事件信息。
例如，您可以通过以下示例查看 ID 为44的防护实例攻击事件列表信息。

请求示例

POST https://open.volcengineapi.com/?Action=DescAttackEvent&Version=2022-01-01
X-Date: 20230711T035055Z
Authorization: HMAC-SHA256 Credential=AKLTNGU0OGEyMT***/20230711/cn-beijing/origin_defence/request, SignedHeaders=content-type;x-content-sha256;x-date, Signature=da4fac562d00f41ad8***

{
  "CurrPage": 1,
  "PageSize": 10,
  "InsId": 44,
  "BeginTime": 1693560540,
  "EndTime": 1698744600,
  "IpList": [
    "1.1.1.1"
  ]
}

返回示例

{
    "ResponseMetadata": {
        "RequestId": "202311161734246BEE1DD4ED914596****",
        "Action": "DescAttackEvent",
        "Version": "2022-01-01",
        "Service": "origin_defence",
        "Region": "cn-beijing"
    },
    "Result": {
        "AttackedIpNum": 1,
        "TotalIpNum": 3,
        "AttackCount": 3,
        "Attacks": [
            {
                "Id": 606,
                "AttackType": "SYN Flood",
                "Ip": "1.1.1.1",
                "Status": 2,
                "PeakDropKbps": 80817,
                "PeakDropPps": 152646,
                "Duration": 4269,
                "StartTime": 1693920180,
                "EndTime": 1693924449
            },
            {
                "Id": 604,
                "AttackType": "SYN Flood",
                "Ip": "1.1.1.1",
                "Status": 2,
                "PeakDropKbps": 32796,
                "PeakDropPps": 61950,
                "Duration": 1869,
                "StartTime": 1693915020,
                "EndTime": 1693916890
            },
            {
                "Id": 603,
                "AttackType": "SYN Flood",
                "Ip": "1.1.1.1",
                "Status": 2,
                "PeakDropKbps": 32998,
                "PeakDropPps": 62005,
                "Duration": 14319,
                "StartTime": 1693832970,
                "EndTime": 1693847290
            }
        ]
    },
    "PageInfo": {
        "TotalCount": 3,
        "PageSize": 10,
        "CurrentPage": 1,
        "Count": 3
    }
}