virtualbox.org

Hi,

host switched from wire to wireless connection,virtualbox-bridge adatper doesn't switch automatically （reboot virtualbox is useless, I need switch to main connection manually）?

but sometimes virtualbox-bridge adapter will change to the connection mode of host, why？

That does not make any sense to me. The guest can never be in wireless mode on a bridged connection. And if you are in bridged mode, your vm NIC is bound to a particular physical NIC in the host, either wired or wireless.

What exactly are you trying to tell us? If your vm is running in bridged mode and the physical NIC to which it is bridged has no connection, the guest will also have no connection.