Netgear GSM7224v2 7200 managed switch v8.x CLI reference manual - Page 218

Managed Switch CLI Manual, Release 8.0 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 Format Mode disabled dos-control tcpflag Global Config no dos-control tcpflag This command sets disables TCP Flag Denial of Service protections. Format Mode no dos-control tcpflag Global Config 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. 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 Format Mode disabled dos-control l4port Global Config Switching Commands v1.0, July 2009 3-182