Requirements:
To start with defaults, just run vagrant up. To tweak defaults, see the vagrant-settings.yaml_defaults file. You can rename the file as vagrant-settings.yaml end edit it to override defaults as well.
Note
Make sure the default network choice doesn’t conflict with existing host networks!
Note
If you are running on Ubuntu Xenial, you may need to run the following command: sudo sh -c 'echo 0 > /proc/sys/net/bridge/bridge-nf-call-iptables' or else container networking will be broken.