“Disable VirtualBox DHCP for host-only network” means:
Turn off the built-in DHCP server inside VirtualBox, so your Windows Server DHCP service becomes the only DHCP server giving IP addresses to the client VM.
Why this matters
In your DHCP lab, students are installing and configuring DHCP Server on Windows Server 2019.
But VirtualBox host-only networks can also have their own DHCP server. If VirtualBox DHCP is enabled, then the client VM may get an IP address from VirtualBox, not from the Windows DHCP Server.
That would make the lab confusing because students may think their Windows DHCP scope is working, but actually VirtualBox gave the IP.
Simple example
You want this:
Windows Server DHCP VM
192.168.XX.10
gives IP addresses to client
Not this:
VirtualBox DHCP
gives IP addresses to client
So we disable VirtualBox DHCP.
What to disable
Disable only this:
VirtualBox Host-Only Network DHCP Server
Do not disable the host-only adapter itself.
The host-only adapter/network should still exist so the VMs can communicate with each other.
Then the client should get an address from your Windows DHCP scope, for example:
192.168.XX.100 to 192.168.XX.150
Student-friendly wording
Disable VirtualBox DHCP on the host-only network so that the Windows Server DHCP role is the only DHCP server in this lab. Keep the host-only network enabled, but turn off its built-in DHCP server. Otherwise, the client may receive an IP address from VirtualBox instead of from your Windows DHCP scope.
Ref: Oracle VirtualBox User Guide: VirtualBox supports configurable virtual network cards per VM, host-only networking connects VMs with each other ...
Commands that work in Windows PowerShell 5.1 These DHCP/networking commands are intended for Windows Server PowerShell: Install-WindowsFeature DHCPInstall-WindowsFeature DHCP -IncludeManagementToolsImport-Module ...
