--- sys/netgraph/ng_eiface.c.orig	2007-06-27 09:10:09.000000000 +0200
+++ sys/netgraph/ng_eiface.c	2007-09-27 17:23:11.000000000 +0200
@@ -234,6 +234,12 @@
 		 */
 		BPF_MTAP(ifp, m);
 
+		if (ifp->if_flags & IFF_MONITOR) {
+			ifp->if_ipackets++;
+			m_freem(m);
+			continue;
+		}
+
 		/*
 		 * Send packet; if hook is not connected, mbuf will get
 		 * freed.