9Advanced topics
9.12.5Enabling DNS proxy in NAT mode
For resolving network names the DHCP server of the NAT engine offers a list of regis- tered DNS servers of the host. For some reason you might need to hide the DNS server list, thereby forcing the VirtualBox NAT engine to react to changes in the host network settings, for example about the end of DHCP leases. Replacing of the real list with the address of the DNS proxy can be achieved with the following command:
VBoxManage setextradata "Linux Guest" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/DNSProxy" 1
9.13Configuring the maximum resolution of guests when using the graphical frontend
When guest systems with the Guest Additions installed are started using the graphical frontend (the normal VirtualBox application), they will not be allowed to use screen resolutions greater than the host’s screen size unless the user manually resizes them by dragging the window, switching to fullscreen or seamless mode or sending a video mode hint using VBoxManage. This behavior is what most users will want, but if you have different needs, it is possible to change it by issuing one of the following commands from the command line:
VBoxManage setextradata global GUI/MaxGuestResolution any
will remove all limits on guest resolutions.
VBoxManage setextradata global GUI/MaxGuestResolution >width,height<
manually specifies a maximum resolution.
VBoxManage setextradata global GUI/MaxGuestResolution auto
restores the default settings. Note that these settings apply globally to all guest systems, not just to a single machine.
9.14 Configuring the BIOS DMI information
The DMI data VirtualBox provides to guests can be changed for a specific VM. Use the following commands to configure the DMI BIOS information:
VBoxManage setextradata "My VM" "VBoxInternal/Devices/pcbios/0/Config/DmiBIOSVendor" "Host BIOS Vendor"
VBoxManage setextradata "My VM" "VBoxInternal/Devices/pcbios/0/Config/DmiBIOSVersion"
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