Dell PowerEdge M805 - Manual (Page 171)

Denial of Service Commands 139
Denial of Service Commands
dos-control firstfrag
Use the dos-control firstfrag command in Global Configuration mode to enable 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 than the
configured value, the packets are dropped.
Syntax
dos-control firstfrag [size]
no dos-control firstfrag
• size —TCP header size. (Range: 0-255). The default TCP header size is 20. ICMP packet
size is 512.
Default Configuration
Denial of Service is disabled.
Command Mode
Global Configuration mode
User Guidelines
This command has no user guidelines.
Example
The following example defines a minimum TCP header size of 20. Packets entering with a
smaller header size are dropped.
console(config)#dos-control firstfrag 20