Anti-DDoS Pro provides four 4-layer cleaning modes against the IP-level flow cleaning policies for your choice.
Note: Currently, cleaning mode change only supports CT/CU and International lines. Generally, new cleaning policies take effect several minutes after you change the cleaning mode.
Low: This mode uses loose cleaning policies with a relative large threshold of speed limit.
- Filters packages with defining DDoS characteristics, such as UDP reflection attack packages and attack packages that do not meet TCP characteristics.
- Filters defining SYN flood and ACK flood attacks.
- Applies easing restrictions on access IPs and destination IPs, mostly on the speed limit side.
Medium: The default Medium mode uses normal cleaning policies.
- Filters packages with defining DDoS characteristics, such as UDP reflection attack packages and attack packages that do not meet TCP characteristics.
- Filters defining SYN flood and ACK flood attacks.
- Applies restrictions on access IPs and destination IPs in a certain scope, mostly on the speed limit side.
- UUnder circumstances, enables the reverse detection algorithm for the package filtering in a certain scope.
Emergency: This mode uses relative strict cleaning policies. It enables connection check for each IP to block IPs that have too many connections.
- Filters packages with defining DDoS characteristics, such as UDP reflection attack packages and attack packages that do not meet TCP characteristics.
- Filters defining SYN flood and ACK flood attacks.
- Discards UDP packages.
- Applies restrictions on access IPs and destination IPs in a certain scope. Speed limits, malicious IP blocking and connection limits are enabled.
High: This mode uses strict cleaning policies. It enables the origin authentication algorithm for package filtering under certain conditions.
- Filters packages with defining DDoS characteristics, such as UDP reflection attack packages and attack packages that do not meet TCP characteristics.
- Filters defining SYN flood and ACK flood attacks.
- Discards UDP packages.
- Applies restrictions on access IPs and destination IPs in a certain scope. Speed limits, malicious IP blocking and connection limits are enabled.
- Enables the reverse detection algorithm for the package filtering in a certain scope.
Warning: As some clients may not response normally to this algorithm, partial normal requests can be blocked.
Procedure
By default, your Anti-DDoS Pro instance uses the Medium cleaning mode. You can change the 4-layer cleaning mode as you needed.
Log on to the Anti-DDoS Service console.
Go to Anti-DDoS Pro>Instance List, choose an ISP line of an Anti-DDoS Pro instance, click Setting in the Protection Info column to go to the DDoS Attack Protection page for the instance.
Note: You can also go to Anti-DDoS Pro>Setting>DDoS Attack Protection page, and manually locate the Anti-DDoS Pro instance.
Click Cleaning Mode, locate the ISP line that you want to change the cleaning mode for, and click Change.
Click to select a cleaning mode, and then click OK.
After several minutes, the selected cleaning mode takes effect.