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'''Problem Summary'''' - After booting a Xen domainU it is discovered that the system has been assigned an IP address in the 192.168.122.* address range which is a different to the subnet to which the host (domain0) system belongs. This configuration is commonly encountered on Red Hat Enterprise Linux and recent Fedora releases.
For many Xen configurations this is desired behavior for which there are a number of benefits. For some configurations, however, an IP address on the same subnet (and issued by the same DHCP server) as the Xen host system is needed.
'''Solution''' - By default a number of systems (typically Red Hat based distributions) default to using the virbr0 network bridge for the domainU guests. This provide the private network.