Configures filtering policies to filter out UDP traffic from specific ports. This helps defend against UDP reflection attacks.


OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer. OpenAPI Explorer dynamically generates the sample code of the operation for different SDKs.

Request parameters

Parameter Type Required Example Description
Action String Yes ConfigUdpReflect

The operation that you want to perform. Set the value to ConfigUdpReflect.

Config String Yes {\"UdpSports\":[17,19]}

The configuration of the filtering policy for UDP reflection attacks.

The value is a string that consists of a JSON struct. The JSON struct contains the following fields:

  • UdpSports: the source ports of the UDP traffic that you want to block. This field is required and must be of the ARRAY type. Example: [17,19].

    We recommend that you block the following source ports of UDP traffic:

    • UDP 17: QOTD reflection attacks
    • UDP 19: CharGEN reflection attacks
    • UDP 69: TFTP reflection attacks
    • UDP 111: Portmap reflection attacks
    • UDP 123: NTP reflection attacks
    • UDP 137: NetBIOS reflection attacks
    • UDP 161: SNMPv2 reflection attacks
    • UDP 389: CLDAP reflection attacks
    • UDP 1194: OpenVPN reflection attacks
    • UDP 1900: SSDP reflection attacks
    • UDP 3389: RDP reflection attacks
    • UDP 11211: memcached reflection attacks
InstanceId String Yes ddoscoo-cn-i7m25564****

The ID of the instance.

Note You can call the DescribeInstanceIds operation to query the IDs of all instances.
RegionId String No cn-hangzhou

The region ID of the instance. Valid values:

  • cn-hangzhou: mainland China, which indicates an Anti-DDoS Pro instance. This is the default value.
  • ap-southeast-1: outside mainland China, which indicates an Anti-DDoS Premium instance.

All Alibaba Cloud API operations must include common request parameters. For more information about common request parameters, see Common parameters.

For more information about sample requests, see the Examples section of this topic.

Response parameters

Parameter Type Example Description
RequestId String 9EC62E89-BD30-4FCD-9CB8-FA53865FF0D7

The ID of the request.


Sample requests

&<Common request parameters>

Sample success responses

XML format


JSON format

  "RequestId": "9EC62E89-BD30-4FCD-9CB8-FA53865FF0D7"

Error codes

For a list of error codes, visit the API Error Center.