SONaFR is a small system based upon OpenBSD 4.1 with router/NAT/firewalling capabilities that fits on one floppy. No hard disk or CD-ROM is necessary. The system boots from a floppy and all you have to do is to configure it. SONaFR has also transparent firewall and bandwidth control capabilities. It is freeware and copyrighted as a work. Source Code is available in all ftp archives of OpenBSD; this software is not an ordinary program written in a programming language, it is a compilation of various ideas/techniques (kernel configuration, testing of rc script) which gave SONaFR its life.