Vagrant 2.2.18, OSX 11.6 cannot create private network

Vagrant
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Just edit or create the file /etc/vbox/networks.conf and change to:

* 0.0.0.0/0 ::/0

Do not forget the * at the beginning.

This will allow all addresses as host addresses like in old VirtualBox versions.

See: Chapter 6. Virtual Networking (6.7)