Addition to comment - Note that Douane being a kernel modules is not a bad thing. Little Snitch also installs a kernel module. I just would say it didn't go as

Addition to comment - Note that Douane being a kernel modules is not a bad thing. Little Snitch also installs a kernel module. I just would say it didn't go as smooth as I had hoped. It is still the closest thing that comes to Little Snitch, so try it in a VM to see if it is for you.