Alibaba Cloud provides basic DDoS protection capabilities to help mitigate DDoS attacks on cloud products open to the public network. When the network traffic of the public IP address of the cloud product exceeds the specified cleaning threshold, the traffic to this IP is automatically scrubbed to protect your normal service from DDoS attacks.

For more information about traffic scrubbing, see Traffic scrubbing, black hole, and threshold value.

The maximum cleaning threshold supported for each Alibaba cloud service depends on the specifications of the instance. When you create or change an ECS or SLB instance, the system automatically adjusts the maximum cleaning threshold based on the current instance specification.
Note The actual black hole threshold for each instance IP is calculated based on factors such as maximum cleaning threshold and security credibility score.