The orginal author of the package could not be identified with absolute certainty. He or she is believed to be from the Italian research networking community. David Harmelin (DANTE) has added the sampling feature. Simon Leinen removed lots of unused code, implemented source address spoofing and packaged the program for easier compilation/installation. Otmar Lendl added source-dependent rules and config-file parsing. Vladimir A. Jakovenko contributed a patch that makes source address spoofing work under BSD-derived systems such as FreeBSD and OpenBSD. These require an additional socket option (IP_HDRINCL). Juraj Sucik found a bug that would cause the `spoof' option to be randomly enabled even though the `-S' argument wasn't passed to the program. James Sella contributed the `-s' (bind to specific address) and `-f' (fork into background) options. Gary Mikula contributed UDP checksum generation in `spoof' mode.