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Is it possible to configure a VPN with "Tunnel Interface" Policy Type between Sonicwall and another vendor?
I have seen it working successfully in tunnel interface mode with AWS and Azure as the remote end. It should work with other vendors.
What vendor are you using on the remote end?
If I'am not totally mistaken I believe to remember that I've had working Tunnel Interface Policies to bintec-elmeg routers, but mostly Site-to-Site is the way to go, depending on the expertise of the other side :)