Syn-Flood Detect Non-Specific - HP MSR Series Command Reference Manual

ipv6 ipv6-address: Specifies the IPv6 address to be protected. The ipv6-address argument cannot be a
multicast address or all 0s.
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: Sets 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.
drop: Drops subsequent SYN packets destined for the protected IP address.
logging: Enables logging for SYN flood attack events. The log information records the detection interface,
victim IP address, MPLS L3VPN instance name, current packet statistics, prevention action, and start time
of the attack.
Usage guidelines
You can configure SYN flood attack detection for multiple IP addresses in one attack defense policy.
With SYN flood attack detection configured, the device is in attack detection state. An attack occurs
when the device detects that the sending rate of SYN packets to a protected IP address reaches or
exceeds the threshold. The device enters prevention state and takes actions to protect the target IP
address. When the rate is below the silence threshold (three-fourths of the threshold), the device
considers that the threat is over and returns to the attack detection state.
Examples
# Configure SYN flood attack detection for 192.168.1.2 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-flood detect ip 192.168.1.2 threshold
2000
Related commands
• syn-flood action

syn-flood detect non-specific

•
• syn-flood threshold
syn-flood detect non-specific
Use syn-flood detect non-specific to enable SYN flood attack detection for non-specific IP addresses.
Use undo syn-flood detect non-specific to restore the default.
Syntax
syn-flood detect non-specific
undo syn-flood detect non-specific
Default
SYN flood attack detection is not enabled for non-specific IP addresses.
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