[PERDITION-USERS] How to sort out ONE fixed IP serving several VMs

Hi all, I have following problem: Host       Ubuntu 14.04 desktop VMs       Ubuntu 14.04 desktop/server edition VirtualBox I have several websites running on VMs, each with its own domain/subdomain and internal IP address.  But I have only one Fixed IP/External IP.  Could Perdition help me out?  If YES please advise where can I find relevant document of its setup? All VMs are Apache server running WordPress.  My problem is I have only ONE Fixed IP.  I can create many internal IPs on router. Several years ago I made use of Perdition to setup several mail servers on VMs but served with only ONE Fixed IP.  It worked seamlessly.  All emails were delivered to their own servers.  Maybe I can dig up the respective documents on my database.  But I have no idea whether it also work on web-server? Thanks Regards satimis