The following reply was made to PR kern/27474; it has been noted by GNATS. From: Darren Reed <darrenr at FreeBSD.org> To: freebsd-gnats-submit at FreeBSD.ORG Cc: Subject: Re: kern/27474 Date: Mon, 18 Jul 2005 22:57:47 GMT Fixing this requires callbacks from attach/detach in sys/net/if.c Using ifnet_departure_event and ifnet_arrival_event would be the key here.