I haven't updated the site with this information yet, but proof-of-concept code for freebsd is now available at: http://www.episec.com/people/edelkind/patches/kernel/flowpriv/flowpriv-concept.tar.gz If you want to try it out, you'll need the 5.1-RELEASE-p2 kernel source, which is available via cvsup with the tag RELENG_5_1 . ari