If upgrading to 3.11.x be aware of the dropped support for the legacy auth
tables. The relevant notes from NEWS.txt:
The authentication & authorization subsystems have been redesigned to
support role based access control (RBAC), resulting in a change to the
schema of the system_auth keys
Documentation for Virtual box networking can be found here:
https://www.virtualbox.org/manual/ch06.html
You can probably achieve what you're set up using two separate internal
networks and some custom routing on the Windows 10 host.
This question may be better suited for the virtualbox user maili
