Novell LINUX ENTERPRISE SERVER 11 - VIRTUALIZATION Manual page 51

Systems that are not aware of paravirtualized hardware, may not have this option. To
connect systems to a network that can only run fully virtualized, several emulated net-
work interfaces are available. The following emulations are at your disposal:
• Realtek 8139 (PCI). This is the default emulated network card.
• AMD PCnet32 (PCI)
• NE2000 (PCI)
• NE2000 (ISA)
• Intel e100 (PCI)
• Intel e1000 (PCI)
All the network interfaces are just software interfaces. Because every network interface
must have a unique MAC address, an address range has been assigned to Xensource
that can be used by these interfaces.
TIP: Virtual Network Interfaces and MAC Addresses
The default configuration of MAC addresses in virtualized environments just
creates a random MAC address that looks like 00:16:3E:xx:xx:xx. Normally the
amount of available MAC addresses should be big enough to only get unique
addresses. However if you have a very big installation, or if you want to make
sure that no problems arise from random MAC address assignment, you can
also manually assign these addresses.
For debugging or system management purposes, it may be useful to know which virtual
interface in Domain0 is connected to which ethernet device in a running guest. This
information may be read from the device naming in Domain0. All virtual devices follow
the rule vif<domain number>.<interface_number>.
As an example, if you want to know the device name for the third interface (eth2) of
the VM Guest with id 5, the device in Domain0 would be vif5.2. To obtain a list of
all available interfaces, run the command ip a.
The device naming does not contain any information to which bridge this interface is
connected. However, this information is available in Domain0 anyways. To get an
Virtual Networking 41