it seems much like you are getting lacked with some modules, rather than a well scripted firewall script. You need to test with lsmod and be sure that you have modules loaded for the iptables flags and chains. Just take a look at these modules which I have loaded below and relevant for iptables:
Code:
ipt_REJECT
ipt_LOG
ipt_state
ipt_MASQUERADE
iptable_nat
ip_conntrack
iptable_filter
ip_tables
According to me, You're not loading one or more of them. Just check it out and install the rest of the modules.
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