Great question.  I don't think I was able to determine this information from the Vagrant docs (http://docs.vagrantup.com/v2/networking/private_network.html).  I believe I had to run `ifconfig` in the virtual machine or possibly look at `phpinfo()` in the browser.  But, the IP address of the host (your physical machine) should be based on the `:private_network, ip:` value with the last number being 1.  So if the private IP address was set to `192.168.33.22`, the host IP address should still be `192.168.33.1`.  As this bit of info seems important, I'll try to incorporate it.