Possible Duplicate:
How to best defend against a “slowloris” DOS attack against an Apache web server?

As everybody here I was interested in hacking in a period of time, using a perl scripts. CSF is protecting me from every perl script which can make damage. But not from this one here:

http://pastebin.com/CfRiSVkQ

It's Syn Flood script, when I attack my dedicated server from another dedicated with 100MBPS link csf is detecting the attack and he always block attackers address but I am flooded and sites are down, I get email from csf, but attack is still damaging sites! Then I need to restart httpd, csf and sites are online again...