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ProSafe XSM7224S Managed Stackable Switch CLI Manual, Software Version 9.0
Switching Commands 3-186
v1.0, November 2010
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.
no dos-control tcpflag
This command sets disables TCP Flag Denial of Service protections.
dos-control l4port
This command enables L4 Port Denial of Service protections. If the mode is enabled, Denial of
Service prevention is active for this type of attack. If packets ingress having Source TCP/UDP Port
Number equal to Destination TCP/UDP Port Number, the packets will be dropped if the mode is
enabled.
Default disabled
Format dos-control tcpflag
Mode Global Config
Format no dos-control tcpflag
Mode Global Config
Note: Some applications mirror source and destination L4 ports - RIP for example uses
520 for both. If you enable dos-control l4port, applications such as RIP may
experience packet loss which would render the application inoperable.
Default disabled
Format dos-control l4port
Mode Global Config