Comment 15 for bug 1669501

John, I don't understand why the preauth check is necessary. You mentioned dealing with broken networking with some MAAS setups, but how does doing the preauth help with that in any way? Is this just an optimization to try to use the internal address when possible to save on cloud charges but not being able to reliably detect whether the private address goes to the right machine from where `juju ssh` is being called?