mitchellh/vagrant — pull request #2020 by tejaycar (2013-08-02 15:34:50+00:00)
Title: Internal Network for VirtualBox Provider

This pull request allows for a virtual box provider configuration that specifies a `private_net_type` of either `:intnet` or `:host_only`. By default, it is :host_only, thus changing nothing in the nominal case. However, this allows the user to specify that `:private_network`s be created as virtual box internal networks rather than host only networks. It also allows v1 vagrantfiles to specify networks of :intnet type (to bring this same functionality to v1 vagrant files.

This pull request borrows heavily from PR https://github.com/mitchellh/vagrant/pull/1400. and https://github.com/mitchellh/vagrant/pull/1382.