While sorting out this HOWTO and learning how to setup Zentyal I used my Network lab, See how to set up your own. If you do use this then remember to turn of the DHCP server in the router if you intend to use the DHCP server within the Zentyal server.
I’m always playing around with new IT technology. Up until recently I just did it with VirtualBox on my PC’s and messed with the network and then cleared up the mess afterwards. This was not good, not to mention a waste of time when I could be playing around with the next new shiny bit of tech or software.