@yamakasi (smells like some fellow French there, ain't it ?) : update your iptables ! Maybe an apt-get will do, don't know !
Edited as power kernel is not needed but I don't think you have iptables installed correctly. What is the output of Code: sudo iptables -d
iptables V1.4.6: option '-d' requires an argument try 'iptables -h' or 'iptables --help' for more information