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Parameters
high: Specifies the high level. None of the currently supported single-packet attacks belongs to this
level.
info: Specifies the informational level. For example, large ICMP packet attack is on this level.
low: Specifies the low level. For example, the traceroute attack is on this level.
medium: Specifies the medium level. For example, the WinNuke attack is on this level.
Usage guidelines
According to their severity, single-packet attacks are divided into four levels: info, low, medium, and
high. Enabling signature detection for a specific level enables signature detection for all
single-packet attacks on that level. Use the signature level action command to specify the actions
against single-packet attacks on a specific level. If you enable signature detection for a single-packet
attack also by using the signature detect command, action parameters in the signature detect
command take effect.
To display the level to which a single-packet attack belongs, use the display attack-defense policy
command.
Examples
# Enable signature detection for informational-level single-packet attacks in attack defense policy
atk-policy-1.
<Sysname> system-view
[Sysname] attack-defense policy 1
[Sysname-attack-defense-policy-1] signature level info detect
Related commands
display attack-defense policy
signature detect
signature level action
syn-ack-flood action
Use syn-ack-flood action to specify global actions against SYN-ACK flood attacks.
Use undo syn-ack-flood action to restore the default.
Syntax
syn-ack-flood action { drop | logging }*
undo syn-ack-flood action
Default
No global action is specified for SYN-ACK flood attacks.
Views
Attack defense policy view
Predefined user roles
network-admin
mdc-admin
Parameters
drop: Drops subsequent SYN-ACK packets destined for the victim IP addresses.
logging: Enables logging for SYN-ACK flood attack events.
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