Setting up VirtualBox networking

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http://superuser.com – I have planned to install Ubuntu Server on our physical server but before that I'd like to mess up with that system in VirtualBox so I know I can get it working. I have installed Ubuntu Server 13.04 on my PC in VirtualBox as well as Ubuntu 13.04 desktop edition. Now I need to configure their network. What I want is a private network between the virtual machines and have them able to communicate to each other. That way I can test the servers installed on the server machine. If I set the mode ("Attached to") in network settings in VirtualBox to Internal network I get the virtual local area ne (HowTos)