Changelog for knock-0.5-3.el3.rf.x86_64.rpm :

* Thu Jan 03 2013 Jan Horacek - 0.5-3- patch for building on EL6
* Fri Dec 16 2011 Jan Horacek - 0.5-2- EL6 has libpcap-devel
* Tue Sep 26 2006 Dries Verachtert - 0.5-1- Updated to release 0.5.
* Thu Apr 15 2004 Dag Wieers - 0.1-1- Initial package. (using DAR)