Hello, Here is a patch for ef(4) which adds some locking: http://freebsd.czest.pl/dunstan/FreeBSD/if_ef.1.patch It's known to be not entirely right, but could be commited to improve current situation of ef(4). Testers are welcome. Thanks, -- Wojciech A. Koszek wkoszek at FreeBSD.org http://FreeBSD.czest.pl/dunstan/