s.w.a -3 Junior Poster in Training

hello,
please i need to know how can i let the syn cookie work within requirments, i read that the syn cookie work automaticaly by the OS when a limit of the queue is exeeded,
please how can i let the syn cookie work in a specific condition(not necessary that i am now under attack)
please is it possible???
if yes, or may be yes any one can help me, lead me to helpful links or sugust any think i will be very thank
best regard