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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 { client-verify | drop | logging } *
undo syn-ack-flood action
Default
No action is taken against detected SYN-ACK flood attacks.
Views
Attack defense policy view
Predefined user roles
network-admin
Parameters
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 SYN-ACK packets destined for the victim IP addresses.
logging: Enables logging for SYN-ACK flood attack events. The log information records the detection
interface, victim IP address, MPLS L3VPN instance name, current packet statistics, prevention actions,
and start time of the attack.
Usage guidelines
To configure the SYN-ACK flood attack detection to collaborate with the TCP client verification, make sure
the client-verify keyword is specified and the TCP client verification is enabled. To enable TCP client
verification, use the client-verify tcp enable command.
Examples
# Specify drop as the global action against SYN-ACK flood attacks 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-ack-flood action drop
Related commands
• client-verify tcp enable
• syn-ack-flood detect
• syn-ack-flood detect non-specific
• syn-ack-flood threshold
syn-ack-flood detect
Use syn-ack-flood detect to configure IP-specific SYN-ACK flood attack detection.
Use undo syn-ack-flood detect to remove the SYN-ACK flood attack detection configuration for an IP
address.
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