case $operatingsystem {
                CentOS: { 
                        $iptables_packages = ["iptables"],
                        $iptables_loc = "/etc/sysconfig/iptables"
                        }
                debian: { 
                        $iptables_packages = ["iptables"], 
                        $iptables_loc = "/etc/network/iptables"
                        }
        }