Screen function only generate alarm without dropping packet: OFF.
ICMP flood protection(1000)                         on        
UDP flood protection(1000)                          on        
SYN flood protection(200)                           on        
        Alarm  Threshold: 1024
        Queue  Size     : 10240
        Timeout Value   : 20
        Source Threshold: 1024
        Destination Threshold: 2148