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I have several VMs configured using internal networking. Is there a way to simulate a network outage on particular VM interfaces from the host OS while the guests are running?

You can disable the cable connect on a per VM basis but not as a whole.

Perryg wrote:You can disable the cable connect on a per VM basis but not as a whole.

Toggling by VM/interface is fine (actually what I want). Using the GUI to toggle the connectivity works while the VM is running. However, I have more than 4 NICs to toggle, so I really would like to use the command line for this.

Running 'vboxmanage modifyvm IMAGE_NAME --cableconnected5 off' yields the error 'VBoxManage.exe: error: The machine 'IMAGE_NAME' is already locked for a session (or being unlocked)'

You could try VBoxManage controlvm <name> setlinkstateX off