Syn-Flood Threshold - HP FlexNetwork 7500 Series Command Reference Manual

Views
Attack defense policy view
Predefined user roles
network-admin
mdc-admin
Usage guidelines
The global SYN flood attack detection applies to all IP addresses except for those specified by the
syn-flood detect command. The global detection uses the global trigger threshold set by the
syn-flood threshold command and global actions specified by the syn-flood action command.
Examples
# Enable global SYN flood attack detection in attack defense policy atk-policy-1.
<Sysname> system-view
[Sysname] attack-defense policy atk-policy-1
[Sysname-attack-defense-policy-atk-policy-1] syn-flood detect non-specific
Related commands
syn-flood action
syn-flood detect

syn-flood threshold

syn-flood threshold
Use syn-flood threshold to set the global threshold for triggering SYN flood attack prevention.
Use undo syn-flood threshold to restore the default.
Syntax
syn-flood threshold threshold-value
undo syn-flood threshold
Default
The global threshold is 1000 for triggering SYN flood attack prevention.
Views
Attack defense policy view
Predefined user roles
network-admin
mdc-admin
Parameters
threshold-value: Specifies the threshold value. The value range is 1 to 1000000 in units of SYN
packets sent to an IP address per second.
Usage guidelines
With global SYN flood attack detection configured, the device is in attack detection state. When the
sending rate of SYN packets to an IP address reaches the threshold, the device enters prevention
state and takes the specified actions. When the rate is below the silence threshold (three-fourths of
the threshold), the device returns to the attack detection state.
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