Routed VPN tunnels, with no tunnel IP
In SonicOS we can create an IPsec policy with Policy Type "Tunnel Interface". Then create routes that use this interface. No need to create a interface on top of that with an IP address [but you can if you like].
Is this a Sonicwall-proprietary thing? If it's not, what's the name of it? Is it an "unnumbered VTI"?