Use vagrant-hostmaster to automatically update /etc/hosts
with your Vagrant VMs:
$ gem install vagrant-hostmaster
$ vagrant provision
[vagrant] Updating host entry for box0 VM. Administrator privileges will be required…
[vagrant] Updating host entry for box1 VM. Administrator privileges will be required...
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
fe80::1%lo0 localhost
33.33.33.100 box0 # VAGRANT: b3e2de74-... (box0)
33.33.33.101 box1 # VAGRANT: 83a8ee1d-... (box1)