889
threshold
threshold-value
: Specifies the threshold for triggering FIN flood attack prevention. The
value range is 1 to 1000000 in units of FIN packets sent to the specified IP address per second.
action
: Specifies the actions when a FIN flood attack is detected. If no action is specified, the global
actions set by the
fin-flood action
command apply.
client-verify
: Adds the victim IP addresses to the protected IP list for TCP client verification. If TCP
client verification is enabled, the device provides proxy services for protected servers.
drop
: Drops subsequent FIN packets destined for the protected IP address.
logging
: Enables logging for FIN flood attack events.
none
: Takes no action.
Usage guidelines
With FIN flood attack detection configured for an IP address, the device is in attack detection state.
When the sending rate of FIN packets to the 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.
Examples
# Configure FIN flood attack detection for 192.168.1.2 in the attack defense policy
atk-policy-1
.
<Sysname> system-view
[Sysname] attack-defense policy atk-policy-1
[Sysname-attack-defense-policy-atk-policy-1] fin-flood detect ip 192.168.1.2 threshold
2000
Related commands
fin-flood action
fin-flood detect non-specific
fin-flood threshold
fin-flood detect non-specific
Use
fin-flood detect non-specific
to enable global FIN flood attack detection.
Use
undo fin-flood detect non-specific
to disable global FIN flood attack detection.
Syntax
fin-flood detect non-specific
undo fin-flood detect non-specific
Default
Global FIN flood attack detection is disabled.
Views
Attack defense policy view
Predefined user roles
network-admin
Usage guidelines
The global FIN flood attack detection applies to all IP addresses except for those specified by the
fin-flood detect
command. The global detection uses the global trigger threshold set by the
fin-flood threshold
command and global actions specified by the
fin-flood action
command.