Small network of about 8 Macs, couple of printers, two Mini servers. Cable modem into an Airport Extreme (6th Gen) then into a 16 port switch. Looking to setup two remote file servers for access by remote workers (we presently have two Mac Minis running OS X server with attached GRAID storage that will need to be accessed). The workers will be accessing the server via user ID and password. The initial thought was to set them up as sftp servers. Would we need public IPs for that? Can the AE handle multiple public IPs? Would multiple VPN servers be better here? Is there an easier, more secure, elegant solution? Just asking for a point in the right direction from those who I'm sure have a lot more knowledge in this area than I ever will. We're not opposed to having to get a new router, etc.