Syn-Flood Detect - H3C MSR Series Command Reference Manual

logging: Enables logging for SYN flood attack events.
Usage guidelines
For the SYN 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 flood attacks 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] syn-flood action drop
Related commands

syn-flood detect

syn-flood detect non-specific
syn-flood threshold
syn-flood detect
Use syn-flood detect to configure IP address-specific SYN flood attack detection.
Use undo syn-flood detect to remove the IP address-specific SYN flood attack detection
configuration.
Syntax
syn-flood detect { ip ipv4-address | ipv6 ipv6-address } [ vpn-instance vpn-instance-name ]
[ threshold threshold-value ] [ action { { client-verify | drop | logging } * | none } ]
undo syn-flood detect { ip ipv4-address | ipv6 ipv6-address } [ vpn-instance vpn-instance-name ]
Default
IP address-specific SYN flood attack detection is not configured.
Views
Attack defense policy view
Predefined user roles
network-admin
Parameters
ip ipv4-address: Specifies the IPv4 address to be protected. The ipv4-address argument cannot be
255.255.255.255 or 0.0.0.0.
ipv6 ipv6-address: Specifies the IPv6 address to be protected.
vpn-instance vpn-instance-name: Specifies the MPLS L3VPN instance to which the protected IP
address belongs. The vpn-instance-name argument is a case-sensitive string of 1 to 31 characters.
Do not specify this option if the protected IP address is on the public network.
threshold threshold-value: Specifies the threshold for triggering SYN flood attack prevention. The
value range is 1 to 1000000 in units of SYN packets sent to the specified IP address per second.
action: Specifies the actions when a SYN flood attack is detected. If no action is specified, the global
actions set by the syn-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.
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