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    Anti-DDoS:ModifyDefenseThreshold

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    Anti-DDoS:ModifyDefenseThreshold

    Last Updated:Jan 19, 2026

    Modifies the Anti-DDoS scrubbing threshold for a single asset with a public IP address.

    Operation description

    QPS limits

    The queries per second (QPS) limit for this API is 10 calls per second for each user. If you exceed the limit, API calls are throttled. This can affect your business. We recommend that you call this API at a reasonable rate.

    Try it now

    Try this API in OpenAPI Explorer, no manual signing needed. Successful calls auto-generate SDK code matching your parameters. Download it with built-in credential security for local usage.

    Test

    RAM authorization

    The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

    • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

    • API: The API that you can call to perform the action.

    • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

    • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

      • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

      • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

    • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

    • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

    Action

    Access level

    Resource type

    Condition key

    Dependent action

    yundun-ddos:ModifyDefenseThreshold

    update

    *All Resource

    *

    		 None None

    Request parameters

    Parameter

    Type

    Required

    Description

    Example
    DdosRegionId

    string

    Yes

    The region ID of the asset that is assigned a public IP address.

    Note

    Call DescribeRegions to query all region IDs.

    cn-hangzhou
    InstanceType

    string

    Yes

    The instance type of the asset that is assigned a public IP address. Valid values:

    • ecs: Elastic Compute Service (ECS) instance.

    • slb: Server Load Balancer (SLB) instance.

    • eip: Elastic IP Address (EIP) instance.

    • ipv6: IPv6 Gateway instance.

    • swas: simple application server instance.

    • waf: dedicated Web Application Firewall (WAF) instance.

    • ga_basic: basic Global Accelerator (GA) instance.

    ecs
    InstanceId

    string

    Yes

    The instance ID of the asset that is assigned a public IP address.

    Note

    Call DescribeInstance to query the IDs of the ECS, SLB, and EIP instances that belong to your Alibaba Cloud account.

    i-uf6idy3c57psf7vu****
    Bps

    integer

    No

    The scrubbing threshold for traffic in Mbps. This value cannot exceed the peak public network traffic of the instance. If you specify Bps, you must also specify Pps. Otherwise, the change does not take effect.

    Use the monitoring tools of your instance to query its public network traffic:

    100
    Pps

    integer

    No

    The scrubbing threshold for packets per second (pps). This value cannot exceed the peak packet traffic of the instance. If you specify Pps, you must also specify Bps. Otherwise, the change does not take effect.

    Use the monitoring tools of your instance to query its packet traffic:

    70000
    IsAuto

    boolean

    No

    Specifies whether to automatically adjust the scrubbing threshold based on the traffic loads of the instance. Valid values:

    • true: The scrubbing threshold is automatically adjusted. You do not need to set the Bps and Pps parameters.

    • false: The scrubbing threshold is not automatically adjusted. You must set the Bps and Pps parameters.

    Default value: false

    false
    InternetIp

    string

    No

    The public IP address of the asset.

    192.0.XX.XX
    ClientToken

    string

    No

    Response elements

    Element

    Type

    Description

    Example

    object

    RequestId

    string

    The unique ID of the request, generated by Alibaba Cloud. You can use this ID to troubleshoot and locate issues.

    BC0607F8-A9F3-5E11-977B-D59CD58C64ED

    Examples

    Success response

    JSON format

    {
  "RequestId": "BC0607F8-A9F3-5E11-977B-D59CD58C64ED"
}

    Error codes

    See Error Codes for a complete list.

    Release notes

    See Release Notes for a complete list.