Ubuntu :: 10.0.4 - Iptables Script Loaded / Not Active

When i run my iptables script using fw builder (=installed on my router/server) everything works fine...until i reboot (nomather "test run" is active or not) to counter this problem i'm using the 'iptables-restore' in the "interfaces" file. upon reboot a "iptables -L" confirms me the correct rules are loaded.

However... tests (eg ping test from an ethx interface) to the outside indicate the script does not seem to be working. upon installing the script with fwbuilder this works again fine....i see no difference in the route table nor do i seen anything suspicious in the syslog. restarting the "network" does not solve anything either

I have seen posts about an you need to activate it by using "/etc/init.d/iptables save active" but theres no iptables in that location. only /sbin contains that program.