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Default
No scanning attack detection is configured.
Views
Attack defense policy view
Predefined user roles
network-admin
mdc-admin
Parameters
level: Specifies the level of the scanning attack detection.
low: Specifies the low level. This level provides basic scanning attack detection. It has a low false
alarm rate but many scanning attacks cannot be detected. Statistics are collected every 60 seconds
for the low level detection.
high: Specifies the high level. This level can detect most of the scanning attacks, but has a high false
alarm rate. Some packets from active hosts might be considered as attack packets. Statistics are
collected every 600 seconds for the high level detection.
medium: Specifies the medium level. Compared with the high and low levels, this level has medium
false alarm rate and attack detection accuracy. Statistics are collected every 90 seconds for the
medium level detection.
action: Specifies the actions against scanning attacks.
block-source: Adds the attackers' IP addresses to the IP blacklist. If the blacklist feature is enabled
on the receiving interface, the device drops subsequent packets from the blacklisted IP addresses.
timeout minutes: Specifies the aging timer in minutes for the dynamically added blacklist entries, in
the range of 1 to 1000. The default aging timer is 10 minutes.
drop: Drops subsequent packets from detected scanning attack sources.
logging: Enables logging for scanning attack events.
Usage guidelines
To collaborate with the IP blacklist feature, make sure the blacklist feature is enabled on the interface
to which the attack defense policy is applied.
The aging timer set by the timeout minutes option must be longer than the statistics collection
interval.
Examples
# Configure low level scanning attack detection and specify the prevention action as drop in attack
defense policy atk-policy-1.
<Sysname> system-view
[Sysname] attack-defense policy atk-policy-1
[Sysname-attack-defense-policy-atk-policy-1] scan detect level low action drop
# Configure scanning attack detection in attack defense policy atk-policy-1. Specify the detection
level as low and the prevention actions as block-source and logging. Set the aging time for the
dynamically added IP blacklist entries to 10 minutes.
<Sysname> system-view
[Sysname] attack-defense policy atk-policy-1
[Sysname-attack-defense-policy-atk-policy-1] scan detect level low action logging
block-source timeout 10
Related commands
blacklist enable
583
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