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Xen 3.0 Virtualization User Guide
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5.2.1 Xen virtual network topology

Each domain network interface is connected to a virtual network interface in dom0 by a point to point link (effectively a ``virtual crossover cable''). These devices are named vif<domid>.<vifid> (e.g. vif1.0 for the first interface in domain 1, vif3.1 for the second interface in domain 3).

Traffic on these virtual interfaces is handled in domain 0 using standard Linux mechanisms for bridging, routing, rate limiting, etc. Xend calls on two shell scripts to perform initial configuration of the network and configuration of new virtual interfaces. By default, these scripts configure a single bridge for all the virtual interfaces. Arbitrary routing / bridging configurations can be configured by customizing the scripts, as described in the following section.

Xen 3.0 Virtualization User Guide
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