In order to access the Vagrant environment created, Vagrant exposes some high-level networking options for things such as forwarded ports, connecting to a public network, or creating a private network.
The high-level networking options are meant to define an abstraction that works across multiple providers. This means that you can take your Vagrantfile you used to spin up a VirtualBox machine and you can reasonably expect that Vagrantfile to behave the same with something like VMware.
You should first read the basic usage page and then continue by reading the documentation for a specific networking primitive by following the navigation to the left.
» Advanced Configuration
In some cases, these options are too high-level, and you may want to more finely tune and configure the network interfaces of the underlying machine. Most providers expose provider-specific configuration to do this, so please read the documentation for your specific provider to see what options are available.