Help Center> Anti-DDoS Service> FAQs> General FAQs> What Can I Do If an IP Address Is Blocked?
Updated on 2024-02-01 GMT+08:00
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What Can I Do If an IP Address Is Blocked?

Possible Causes

Anti-DDoS provides a maximum of 500 Mbit/s protection capacity free of charge (depending on the available bandwidth of Huawei Cloud).Anti-DDoS will trigger a black hole to block access from the Internet within a time period when detecting a cloud server is under volumetric flood attacks.

How Do I Deactivate a Black Hole?

When the access to a cloud server is blocked by Huawei Cloud because attack traffic targeting a cloud server exceeds a certain threshold, follow the instructions described in Table 1 to handle that.

Table 1 Black hole deactivation methods

Edition

Deactivation Policy

Deactivation Method

Anti-DDoS

NOTE:

Anti-DDoS is enabled by default.
  • The system automatically deactivates the black hole 24 hours after the access to a cloud server is blocked.
  • If the system detects that the attack has not stopped, and attack traffic is still exceeding the configured threshold, the access will be blocked again.
  • You need to wait until the system deactivates it automatically.

CNAD

The system automatically deactivates the black hole 24 hours after the access to a cloud server is blocked.

Advanced Anti-DDoS

You are advised to increase the elastic bandwidth to avoid being black-holed again.

You can upgrade the elastic protection bandwidth to unblock IP addresses from the blackhole.
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