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...having trouble understanding the role of each component in the new 1.3 world: In 1.3 networking if Xen has no devices, and domain 0 owns and operates the NIC - does Xen have any role at all in networking for the guest OS''s? Which network device driver will a guest OS use? Do all the vnetif rules defined in Domain 0 now get interpreted by Domain 0 vnet driver? Or still by Xen? How do the actual packets (that will be routed to a guest) flow from the physical NIC - (received by a domain 0 driver, routed/filtered by ???, passed over a evtchn to a guest driver?) Barry Silverman