--- zzzz-none-000/linux-4.4.60/drivers/net/tun.c	2017-04-08 07:53:53.000000000 +0000
+++ dragonfly-4020-701/linux-4.4.60/drivers/net/tun.c	2018-11-08 13:36:17.000000000 +0000
@@ -1713,6 +1713,7 @@
 		dev->vlan_features = dev->features &
 				     ~(NETIF_F_HW_VLAN_CTAG_TX |
 				       NETIF_F_HW_VLAN_STAG_TX);
+		dev->priv_flags |= IFF_TUN_TAP;
 
 		INIT_LIST_HEAD(&tun->disabled);
 		err = tun_attach(tun, file, false);