OK fatal, I'm not a 100% about the type of this attack, and as I mentioned before, I dont have that much of an experience with linux, so let me describe the attack:
I have my forum in /vb/ directory, the ppl who were attacking me were attacking that specific directory only, I noticed that because when I felt that the server is slowing down I changed the folder's name through ssh, and it worked! .. so this told me that the attack is not on the network level, its mainly directed to www.sycoz.com/vb only .
When the attack starts, whenever I try to open a page it just keeps loading and loading without any response from the server, once the attacks stops, the server goes back to its normal condition!.
At one time I was talking with the attacker on yahoo chat, he told me that he's gonna attack in a few seconds, I opened my forum and it was completely normal, then he told me to refresh and when I did the server was not giving any response !, a dedicated server gets jammed by only one user and in a few seconds !!!
Ok now I hope you guys have enough info and may be able to define the type of the attack, and btw, I could provide a link to the software they're using, please PM for it if your interested in ending this headache for me and for many other forum owners