-- will make it inaccessible from Linux, so Wireshark cannot fetch the
-- descriptor by itself. However, it is sufficient if the VirtualBox
-- guest requests the descriptor once while Wireshark is capturing.
-- will make it inaccessible from Linux, so Wireshark cannot fetch the
-- descriptor by itself. However, it is sufficient if the VirtualBox
-- guest requests the descriptor once while Wireshark is capturing.