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Networking

To start, NAT is by far the easiest way to get your guests connected to the interweb, but you may want to use the guests as servers. For this you need Host Networking.

Install Necessary Software

You will need to install bridge-utils and uml-utilities so that you can make a tap device and add it to a bridge.

sudo apt-get install bridge-utils uml-utilities

8.04 Hardy

To configure bridging, you basically go through three steps on the host machine. First you need to create a bridge. Next you create virtual interface(s). Then you add a real interface and virtual interface(s) to the bridge. Because of the scripts available on the distribution which take care of all the details, all of this sums up to two steps:

• declare bridge and real network interface you add to it
• declare virtual interfaces

Create a permanent bridge by editing /etc/network/interfaces

On the host machine:

$ sudo gedit /etc/network/interfaces


auto eth0


iface eth0 inet manual




auto br0


iface br0 inet dhcp


   bridge_ports eth0




# The loopback network interface


auto lo


iface lo inet loopback

"br0" is an arbitrary name. To take the modifications into account, restart the network:

$sudo /etc/init.d/networking restart

From now on, your system will always set up the bridge on boot. Note that this could slow down the boot time a little bit, because of the bridge coming up.

Declare virtual interfaces which will be used by VirtualBox by editing /etc/vbox/interfaces

On the host machine:

$ sudo gedit /etc/vbox/interfaces


# Each line should be of the format :


# <interface name> <user name> [<bridge>]


vbox0 <your user name> br0


vbox1 <your user name> br0


...

"vbox#" is an arbitrary name. You may declare here as many virtual interfaces as you wish, and add it to a bridge.

Later when you will configure the network of your virtual machine you will use the virtual adapter name "vbox#" for host networking. For example if you use the VirtualBox Qt graphical interface, enter "vbox#" in the "Interface Name" field, when choosing "Host interface".

To take the modifications into account, restart the VirtualBox host networking script:

$sudo /etc/init.d/virtualbox-ose restart

The virtual interfaces are now created and added to the bridge.

That's it! Now the different scripts will take care of cleanly create/configure/remove bridges and virtual interfaces when you boot and shut your system down.

Configure networking in VirtualBox