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6.1 Virtual Bridges
When using SUSE Linux Enterprise Desktop the system configures one bridge for each
physical network device by default. For each virtual bridge, a physical Ethernet device
is enslaved, and the IP address assigned to the bridge.
To add a new bridge, for example, after installing an additional Ethernet device, or to
create a bridge that is not connected to a real network, proceed as follows:
1
Start yast2 > Network Devices > Network Settings.
2 Click on the tab Overview and press Add.
3
Select Device Type Bridge. The parameter Configuration Name will be set to the
next free number. Click Next.
4
Either use Dynamic Address (DHCP) as selected by default, or assign a static IP
address to the bridge. Using Dynamic Address is only useful, when also assigning
a device to the bridge that is connected to some DHCP server.
If you intend to create a virtual bridge that has no connection to a real Ethernet
device, use Statically assigned IP Address. In this case, it is a good idea to use
addresses from the private IP address ranges, for example,
192.168.x.x
or
10.x.x.x
.
To create a bridge that should only serve as a connection between the different
guests without connection to the host system, set the IP address to
0.0.0.0
and the netmask to
255.255.255.255
. The network scripts handle this special
address as an unset IP address.
After the bridge is created, it may be used by any of the Xen VM Guest systems. A
purely virtual bridge without connection to a real network device is good to provide
fast network connections between different VM Guest systems. If you provide a
DHCP
server on Domain0 that also defines routing information to the respective guest for the
bridge, the network setup of the respective VM Guest is simplified.
46 Virtualization with Xen