SQL Abuse Report form ISP

I got a lot of reports from ISP that our public IP Address did SQL Abuse Attack

FYI, That IP Address is for student wifi and computer laboratorium
So it is obvious come from our student laptop or computer LAB.

Please give me some solutions in mikrotik firewall to handle this problems.

Thank u very much..
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read this:

http://wiki.mikrotik.com/wiki/Firewall

HPH

M.