well for starters, move your forum to a subdomain. I got this advice from a security company and tested it myself by flooding my own forum with 4 people. and suprisingly nothing happened to my forum! Its been 6 months now and I have had some ddos attacks (seen in the server logs) but it didnt have any effect to my forum! And since it dont work i get a lot less ddos attacks. But this is also just for basic ddos attacks, if you have a pro then he will know the way to do it.
You can also install Mod_dosevasive as an add-on for apache if you have severe attacks from ghost PC's. I wouldnt recommend it unless you get attacked all the time and the subdomain option doesnt work out.
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