diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 6a66adb..3a70567 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1634,7 +1634,7 @@ int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
 	struct ip6_tnl *tnl = netdev_priv(dev);
 
 	if (tnl->parms.proto == IPPROTO_IPIP) {
-		if (new_mtu < 68)
+		if (new_mtu < ETH_MIN_MTU)
 			return -EINVAL;
 	} else {
 		if (new_mtu < IPV6_MIN_MTU)
@@ -1787,6 +1787,8 @@ ip6_tnl_dev_init_gen(struct net_device *dev)
 	dev->mtu = ETH_DATA_LEN - t_hlen;
 	if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 		dev->mtu -= 8;
+	dev->min_mtu = ETH_MIN_MTU;
+	dev->max_mtu = 0xFFF8 - dev->hard_header_len;
 
 	return 0;