--- tun.c.orig	2008-01-23 16:09:25.000000000 -0500
+++ tun.c	2008-01-23 16:12:26.000000000 -0500
@@ -540,9 +540,13 @@
 
 	if (ifr->ifr_flags & IFF_NO_PI)
 		tun->flags |= TUN_NO_PI;
+	else
+		tun->flags &= ~TUN_NO_PI;
 
 	if (ifr->ifr_flags & IFF_ONE_QUEUE)
 		tun->flags |= TUN_ONE_QUEUE;
+	else
+		tun->flags &= ~TUN_ONE_QUEUE;
 
 	file->private_data = tun;
 	tun->attached = 1;