Netgear FSM726v3 7200 managed switch v8.x CLI reference manual - Page 217

Managed Switch CLI Manual, Release 8.0 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 Format Mode disabled dos-control firstfrag [] Global Config no dos-control firstfrag This command sets Minimum TCP Header Size Denial of Service protection to the default value of disabled. Format Mode no dos-control firstfrag 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 Format Mode disabled dos-control tcpfrag Global Config no dos-control tcpfrag This command disabled TCP Fragment Denial of Service protection. Format Mode no dos-control tcpfrag Global Config Switching Commands v1.0, July 2009 3-181