testing and/or dropping DHCP server
dhcdrop is a tool to either reduce the impact of a rogue DHCP server on a network, or as a stress-test tool for use when configuring or developing DHCP servers. It works by flooding the server or attempting to starve it of leasable addresses; it can be used interactively, or it can be configured with the MAC addresses of any legitimate DHCP servers, and will attempt to disrupt any others it sees.
Homepage: http://www.netpatch.ru/dhcdrop.html
Maintainer: Kirill Bychkov <kirby@openbsd.org>