Vagrant network config : NAT + NAT network + HostOnly

# -*- mode: ruby -*-
# vi: set ft=ruby :

# All Vagrant configuration is done below. The "2" in Vagrant.configure
# configures the configuration version (we support older styles for
# backwards compatibility). Please don't change it unless you know what
# you're doing.
Vagrant.configure("2") do |config|
  # The most common configuration options are documented and commented below.
  # For a complete reference, please see the online documentation at
  # https://docs.vagrantup.com.

  # Every Vagrant development environment requires a box. You can search for
  # boxes at https://atlas.hashicorp.com/search.
  config.vm.define "HQ" do |hq|
        hq.vm.box = "minimal/centos7"
        hq.vm.network "private_network", :type => 'dhcp'
        hq.vm.network "private_network", :type => 'dhcp'
        hq.vm.provider "virtualbox" do |vb|
          vb.name = "HQ"
          vb.cpus = 2
          vb.customize ["modifyvm", :id, "--nic2", "hostonly", "--hostonlyadapter2", "VirtualBox Host-Only Ethernet Adapter"]
          vb.customize ["modifyvm", :id, "--nic3", "natnetwork"]
          vb.customize ["modifyvm", :id, "--nat-network3", "NatNetwork"]
        end
  end
end

Succinct and comprehensive. This helped so much!