@ elitepirate ok i submitted a ticket to imack regarding this waiting for his reply.
and thanx to prince i do all the settings u say and lets see the result.

and how can i recognize or find that my site is being ddos attacked?
kakagi Reviewed by kakagi on . bandwidth problem hello i need ur kind help please. my site is hackerz-bb.info. onething i wld like to ask u that my board uses phpbb3(with couple of mods) we are 3 star rated site from starting(dec -08) and get 40-50 user online alltime. but my board is consuming daily 3-4 gb bandwidth which i think is abnormal for starter site like this. is this amount of BW usuage is normal? i run out of BW few days ago. Rating: 5