[Unit]
Description=Firewall et NAT
After=network.target

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/sh -c "/sbin/iptables-restore < /etc/iptables-gateway"
ExecReload=/bin/sh -c "/sbin/iptables-restore < /etc/iptables-gateway"
ExecStop=/bin/sh -c "/sbin/iptables-restore < /etc/iptables-gateway-flush"

[Install]
WantedBy=multi-user.target