The Debian destro work fine but i can't find iptables :
root@raspberrypi:~# iptables -L
FATAL: Module ip_tables not found.
iptables v1.4.8: can't initialize iptables table `filter': iptables who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
It looks like netfilter & co hasn't been compiled in the kernel.
Does anybody knows how to do it ?