+static void
+ipsec_tunnel_feature_set (ipsec_tunnel_if_t * t, u8 enable)
+{
+ vnet_feature_enable_disable ("ip4-output",
+ "esp4-encrypt-tun",
+ t->sw_if_index, enable,
+ &t->output_sa_index,
+ sizeof (t->output_sa_index));
+ vnet_feature_enable_disable ("ip6-output",
+ "esp6-encrypt-tun",
+ t->sw_if_index, enable,
+ &t->output_sa_index,
+ sizeof (t->output_sa_index));
+}
+