We would like to thank Matt Blaze, Theo de Raadt, Martin Fredriksson, Markus Friedl, Hugh Graham, John Ioannidis, Håkan Olsson, Niels Provos, and Jonathan Smith for their support, comments, suggestions, and work in various aspects of this project and paper. Most of the development of isakmpd was funded by Ericsson Radio Systems. The security policy work mentioned in this paper was supported by DARPA under grant F39502-99-1-0512-MOD P0001.