diff --git a/src/vnet/ipsec/ipsec_if.c b/src/vnet/ipsec/ipsec_if.c
index 7d6c725..17f28a0 100644
--- a/src/vnet/ipsec/ipsec_if.c
+++ b/src/vnet/ipsec/ipsec_if.c
@@ -352,6 +352,9 @@
       t->hw_if_index = hw_if_index;
       t->sw_if_index = hi->sw_if_index;
 
+      /* Standard default jumbo MTU. */
+      vnet_sw_interface_set_mtu (vnm, t->sw_if_index, 9000);
+
       /* Add the new tunnel to the DB of tunnels per sw_if_index ... */
       vec_validate_init_empty (im->ipsec_if_by_sw_if_index, t->sw_if_index,
 			       ~0);