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8 VBoxManage reference
• --intnet<1-N> network: If internal networking has been enabled for a vir-
tual network card (see the --nic option above; otherwise this setting has no
effect), use this option to specify the name of the internal network (see chapter
6.6, Internal networking, page 88).
• --macaddress<1-N> auto|<mac>: With this option you can set the MAC
address of the virtual network card. Normally, each virtual network card is as-
signed a random address by VirtualBox at VM creation.
8.5.4 Serial port, audio, clipboard, VRDP and USB settings
The following other settings are available through VBoxManage modifyvm:
• --uart<1-N> off|<I/O base> <IRQ>: With this option you can configure
virtual serial ports for the VM; see chapter 3.7.8, Serial ports, page 53 for an
introduction.
• --uartmode<1-N> <arg>: This setting controls how VirtualBox connects a
given virtual serial port (previously configured with the --uartX setting, see
above) to the host on which the virtual machine is running. As described in
detail in chapter 3.7.8, Serial ports, page 53, for each such port, you can specify
<arg> as one of the following options:
– disconnected: Even though the serial port is shown to the guest, it has
no “other end” – like a real COM port without a cable.
– server <pipename>: On a Windows host, this tells VirtualBox to create
a named pipe on the host named <pipename> and connect the virtual
serial device to it. Note that Windows requires that the name of a named
pipe begin with \\.\pipe\.
On a Linux host, instead of a named pipe, a local domain socket is used.
– client <pipename>: This operates just like server ..., except that
the pipe (or local domain socket) is not created by VirtualBox, but assumed
to exist already.
– <devicename>: If, instead of the above, the device name of a physical
hardware serial port of the host is specified, the virtual serial port is con-
nected to that hardware port. On a Windows host, the device name will
be a COM port such as COM1; on a Linux host, the device name will look
like /dev/ttyS0. This allows you to “wire” a real serial port to a virtual
machine.
• --audio none|null|oss: With this option, you can set whether the VM
should have audio support.
• --clipboard disabled|hosttoguest|guesttohost|bidirectional:
With this setting, you can select whether the guest operating system’s clipboard
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