D-Link DWS-4000 Series Cli Command Reference page 155

dos-control firstfrag
This command enables Minimum TCP Header Size Denial of Service protection. If the mode is enabled, Denial of Service
prevention is active for this type of attack. If packets ingress having a TCP Header Size smaller then the configured value,
the packets will be dropped if the mode is enabled.The default is disabled. If you enable dos-control firstfrag, but do not
provide a Minimum TCP Header Size, the system sets that value to 20.
Default disabled <20>
Format
dos-control firstfrag [<0-255>]
Mode Global Config
no dos-control firstfrag
This command sets Minimum TCP Header Size Denial of Service protection to the default value of disabled.
Format
no dos-control firstfrag
Mode Global Config
dos-control tcpfrag
This command enables TCP Fragment Denial of Service protection. If the mode is enabled, Denial of Service prevention is
active for this type of attack. If packets ingress having IP Fragment Offset equal to one (1), the packets will be dropped if the
mode is enabled.
Default disabled
Format
dos-control tcpfrag
Mode Global Config
no dos-control tcpfrag
This command disabled TCP Fragment Denial of Service protection.
Format
no dos-control tcpfrag
Mode Global Config
dos-control tcpflag
This command enables TCP Flag Denial of Service protections. If the mode is enabled, Denial of Service prevention is active
for this type of attacks. If packets ingress having TCP Flag SYN set and a source port less than 1024 or having TCP Control
Flags set to 0 and TCP Sequence Number set to 0 or having TCP Flags FIN, URG, and PSH set and TCP Sequence Number
set to 0 or having TCP Flags SYN and FIN both set, the packets will be dropped if the mode is enabled.
Default disabled
Format
dos-control tcpflag
Mode Global Config
Denial of Service Commands
147