--- zzzz-none-000/linux-4.4.60/net/l2tp/l2tp_eth.c	2017-04-08 07:53:53.000000000 +0000
+++ dragonfly-4020-701/linux-4.4.60/net/l2tp/l2tp_eth.c	2018-11-08 13:36:17.000000000 +0000
@@ -164,7 +164,7 @@
 	skb->ip_summed = CHECKSUM_NONE;
 
 	skb_dst_drop(skb);
-	nf_reset(skb);
+	nf_reset_no_generic_ct(skb);
 
 	if (dev_forward_skb(dev, skb) == NET_RX_SUCCESS) {
 		atomic_long_inc(&priv->rx_packets);