Global IP on DomU in XEN, using Ubuntu

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http://unix.stackexchange.com – Can a DomU have a global IP in Xen? I see that DomU's are connected to Dom0 and then physical ethernet using xenbridges, so is it technically possible in Xen to assign global IPs to DomU so it can be pinged/accessed by the outside world? Is there any config changes in Xen that I need to do? Can network-route be of some help if used in place of network-bridge? (HowTos)