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