[Unit]
Description=Iptables Helper
After=network.target

[Service]
Environment="HOME=/root"
WorkingDirectory=/opt/iptables-helper
ExecStartPre=/bin/bash -c "[ -f /etc/iptables.rule ] && iptables-restore /etc/iptables.rule || exit 0;"
ExecStart=/opt/iptables-helper/iptables-helper
ExecStartPost=/bin/bash -c "iptables-save | tee /etc/iptables.rule > /dev/null"
Restart=on-failure
KillMode=process
RestartSec=5s

[Install]
WantedBy=multi-user.target