1[Unit] 2Description=Save iptable rules 3DefaultDependencies=no 4After=shutdown.target 5 6[Service] 7Type=oneshot 8RemainAfterExit=true 9ExecStart=/bin/sh -c "iptables-save > /etc/iptables/iptables.rules" 10 11[Install] 12WantedBy=shutdown.target 13