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Host Networking on VirtualBox | LinuxWebLog.com
www.linuxweblog.com/virtualbox-host-networking, posted 2009 by peter in howto linux networking virtualization
This is how I got host networking for VirtualBox and have it setup to use bridging on FedoraCore 6 host. This allows for two way traffic between the host and the guest. You will need bridge-utils and uml-utilities.