Ubuntu 7.04下Virtualbox安装及网络桥接

　　sudo apt-get install uml-utilities

　　sudo apt-get install bridge-utils

　　In order for VirtualBox to be able to access the interface, the user who will be running the virtual machine must be added to the group uml-net, for example with the following command (replace vboxuser with your user name):

　　sudo gpasswd -a vboxuser uml-net

　　You may have to log out and log in again for the change to take effect.

　　2. To describe the TAP interface to your Debian or Ubuntu system, add an entry to the file /etc/network/interfaces. This names the the interface and must also specify the user who will be running the virtual machine using the interface. The following sample entry creates the interface tap0 for the user vboxuser (again, replace with your user name):

　　auto tap0

　　iface tap0 inet manual

　　up ifconfig $IFACE 0.0.0.0 up

　　down ifconfig $IFACE down

　　tunctl_user vboxuser

　　You will probably want to change the entry based on your networking needs. On the host, you will find more documentation in these files:

　　a) /usr/share/doc/uml-utilities/README.Debian and

　　b) /usr/share/doc/ifupdown/examples/network-interfaces.gz.

　　3. The first time it is used, activate the new interface and the bridge with these two commands:

　　sudo /sbin/ifup tap0

　　sudo /sbin/ifup br0

　　This is only needed once, however; the next time the host is restarted, the interface and the bridge should be activated automatically.