SYN flood?

[Peczoli Zoltan <pocok@pcdome.hu>]

hi, 

My system just seems to underwent a SYN attack. Kernel log says

Dec  9 19:45:10 abcde kernel: possible SYN flooding on port 80. Sending
cookies.

and repeats the message

What could be the reason and how can I prevent this happening in the
future?

Bye:
          pocok