Yeah, I got that tunneling was assumed. In fact, VNC is madness without SSH tunneling. However when you look at macOS, the only VNC client that automatically se

Yeah, I got that tunneling was assumed. In fact, VNC is madness without SSH tunneling. However when you look at macOS, the only VNC client that automatically sets up SSH tunneling is Screens. But now comes the trick; one of your machines is behind a NAT. And it's macOS, or Windows, or what have you. No VNC client is going to help you here. With TeamViewer, this just works. There is no open source offering that comes close, to my knowledge, because of the need for a proxy service.