Currently I'm running Ubuntu Server 7.04 with ISPConfig, configured using This Site's Tutorial. I have a DynDNS account with the hostname "bluefish.selfip.com" that points to the static WAN IP address of the DSL modem. The modem is set to forward all incoming traffic to the router/firewall (192.168.3.251), which forwards ports 80, 443, 81 and 53 to the server (192.168.3.19). If I try to visit the site using it's hostname (http://www.bluefish.selfip.com) from another computer on the network, I get: Code: Firefox can't find the server at www.bluefish.selfip.com. Visiting the server's LAN IP address from within the LAN (http://192.168.5.19) gives the error: Code: This IP address is shared. For access to the web site which you look for, enter its address instead of its IP. If I visit the modems LAN IP address within the network (192.168.1.1), I also get the "This IP address is shared..." error. I don't understand where or how I can configure my hostname to refer to different sites on the same server? If they all have the same IP how does it know which site I want to see?