Remote Tunnel Systemd Unit

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[Unit]
Description=Setup a secure tunnel to %I
After=network.target

[Service]
User=root
EnvironmentFile=/etc/default/secure-tunnel@%i
ExecStart=/usr/bin/ssh -NT -o ServerAliveInterval=60 -o ExitOnForwardFailure=yes -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -p ${SSH_PORT} -R ${REMOTE_PORT}:localhost:${LOCAL_PORT} ${TARGET}

# Restart every >2 seconds to avoid StartLimitInterval failure
RestartSec=90
Restart=always

[Install]
WantedBy=multi-user.target