iptables-clean

#!/bin/bash
iptables -F
iptables -X
while read type;
do
  iptables -t $type -F
  iptables -t $type -X
done </proc/net/ip_tables_names

iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

service iptables save
service iptables restart