mitchellh/vagrant — comment on commit 8bb6d375f15d5bd4449573e92a1cb0577b3e678f
File: lib/vagrant/ssh.rb line 123
By hedgehog:

This may be enough, I'm not sure: Everything I've seen suggests that having a well formed string returned by SSH_CONNECTION is the indicator the SSH shell is good to go. You'd need to do some regex to check what you get back is well formed see my email to the list.

I've forgotten the code/logic that uses `up?`, you always retry if it returns false - correct?