Can someone suggest tutorials on how to properly set up a wordpress multisite installation that I can access from both the LAN and WAN side? I've been looking for a bit and am unable to find what i'm looking for.  

 I'm using an Ubuntu server (on VirtualBox) behind my router. I have my domain name setup to forward to my router and it is port forwarding properly. But, what I really want to do is have my site (locally hosted) be accessible from the LAN as well as the WAN. Right now it's one or the other based on how I play with the dashboard>options panel... I don't mind reinstalling if it means having a proper setup.