Have a look at http://www.linuxhomenetworking.com/w...P_Server_Setup
, specifically the part for setting up anonymous users. I assume you want to have rpm packages available for anonymous users, at least it seems that you do mean that by "default users". If you use another ftp server (not vsftpd), then Google for tutorials. Quite difficult to give you samples, if you don't give infos. It's a matter of tweaking with the config files.