You can generate a new Vagrant file with the following command or you can just copy and paste the one below.

vagrant ini bento/fedora-27

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :
VAGRANTFILE_API_VERSION = '2'.freeze
Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  #
  # Virtualbox configs
  config.vm.provider :virtualbox do |vb|
    vb.cpus = 2
    vb.gui = false
    vb.customize ['modifyvm', :id, '--memory', '2048']
    vb.customize ['modifyvm', :id, '--cpus', '2']
    vb.customize ['modifyvm', :id, '--cpuexecutioncap', '50']
  end
  config.ssh.forward_x11 = true
  config.vm.synced_folder '', '', disabled: true

  # Fedora box
  config.vm.define 'fedora' do |fedora|
    fedora.vm.hostname = 'fedora27'
    fedora.vm.box = 'bento/fedora-27'
    fedora.vm.provision 'shell', inline: 'dnf -y install python'
    fedora.vm.network 'public_network', ip: '192.168.33.11', bridge: %w[
      en0
      eth0
      enp0s31f6
      wlp4s0
    ]
  end

  # Ubuntu box
  config.vm.define 'ubuntu' do |ubuntu|
    ubuntu.vm.hostname = 'ubuntu16'
    ubuntu.vm.box = 'bento/ubuntu-16.04'
    ubuntu.vm.provision 'shell', inline: 'apt-get update && apt-get -y install python'
    ubuntu.vm.network 'public_network', ip: '192.168.33.12', bridge: %w[
      en0
      eth0
      enp0s31f6
      wlp4s0
    ]
  end
end

Add your network interface to the list, if it's not already there
%w[en0 eth0 enp0s31f6 wlp4s0]

Bring these boxes up with

vagrant up
...
...

Once they're finished building, check the status

vagrant status
Current machine states:

fedora                    running (virtualbox)
ubuntu                    running (virtualbox)

Ansible inventory.ini file

[vagrant]
fedora27 ansible_host=192.168.33.11
ubuntu16 ansible_host=192.168.33.12

[vagrant:vars]
ansible_connection=ssh
ansible_ssh_user=vagrant
ansible_ssh_pass=vagrant
ansible_python_interpreter=/usr/bin/python2.7

Reach them at the static IP assigned to the bridged network.

ansible -i inventory.ini all -m ping