My routers are connected to a number of tunnels:

1. Nounours has tunnels to OZ7SAT at Amager
2. Gate-Rpi has a tunnel to Vultrgate which again has a number of tunnels to Steve's routers

The main tunnel runs continously controlled by systemd (systemd-networkd.service). The backup tunnel is normally stopped and is only started when needed (openvpn-server@server.service)

The description of the individual tunnels is found by following the links above