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Xen 3.0 Virtualization Interface Guide
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8.1 Network I/O

Virtual network device services are provided by shared memory communication with a backend domain. From the point of view of other domains, the backend may be viewed as a virtual ethernet switch element with each domain having one or more virtual network interfaces connected to it.

From the point of view of the backend domain itself, the network backend driver consists of a number of ethernet devices. Each of these has a logical direct connection to a virtual network device in another domain. This allows the backend domain to route, bridge, firewall, etc the traffic to / from the other domains using normal operating system mechanisms.

Xen 3.0 Virtualization Interface Guide
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  Published under the terms of the GNU General Public License Design by Interspire