Hey,
Now my board have been flooding day through night costs me more than 4000GB per day...

(my board usually takes lower than 1000GB/day) and server loads more than 15.00% (4 cpus). I've had to turn on the Password Protect Directory for the forum root folder each time and the traffics reduce instantly. I can't block the Ip cause if I did, each time the query being created(from the bad guys) and my server wouldn't receive it(block Ip function) and it would automatically write back on the logs server and you know, this can lead to overload and... :ermm:. This disaster can not persist to my board anymore,

Got any suggestion?