The anti-ddos syn-flood defend alert-rate command sets the alarm threshold that triggers global source authentication defense against SYN flood attacks.
The undo anti-ddos syn-flood defend command restores the default alarm threshold (2000 pps).
| Parameter | Description | Value |
|---|---|---|
| alert-rate alert-rate | Specifies the SYN packet rate threshold that triggers global source authentication defense against SYN flood attacks. | The value is an integer ranging from 1 to 80000000, in pps. The default value is 2000. |
If alert-rate is not specified, the default alarm threshold is used.
After the anti-ddos syn-flood source-detect command is executed to enable the global source authentication defense against SYN flood attacks, the defense is triggered when the rate of SYN packets destined for the same destination IP address reaches the alarm threshold.