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diff --git a/src/plugins/nat/nat66/nat66.api b/src/plugins/nat/nat66/nat66.api
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+++ b/src/plugins/nat/nat66/nat66.api
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+/*
+ * Copyright (c) 2020 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+option version = "1.0.0";
+import "vnet/ip/ip_types.api";
+import "vnet/interface_types.api";
+import "plugins/nat/nat_types.api";
+
+/** \brief Enable/disable NAT66 feature on the interface
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param is_add - true if add, false if delete
+    @param flags - flag NAT_IS_INSIDE if interface is inside or
+                   interface is outside,
+    @param sw_if_index - software index of the interface
+*/
+autoreply define nat66_add_del_interface {
+  u32 client_index;
+  u32 context;
+  bool is_add;
+  vl_api_nat_config_flags_t flags;
+  vl_api_interface_index_t sw_if_index;
+};
+
+/** \brief Dump interfaces with NAT66 feature
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat66_interface_dump {
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT66 interface details response
+    @param context - sender context, to match reply w/ request
+    @param flags - flag NAT_IS_INSIDE if interface is inside or
+                   interface is outside,
+    @param sw_if_index - software index of the interface
+*/
+define nat66_interface_details {
+  u32 context;
+  vl_api_nat_config_flags_t flags;
+  vl_api_interface_index_t sw_if_index;
+};
+
+/** \brief Add/delete 1:1 NAT66
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param is_add - true if add, false if delete
+    @param local_ip_address - local IPv6 address
+    @param external_ip_address - external IPv6 address
+    @param vrf_id - VRF id of tenant
+*/
+autoreply define nat66_add_del_static_mapping {
+  u32 client_index;
+  u32 context;
+  bool is_add;
+  vl_api_ip6_address_t local_ip_address;
+  vl_api_ip6_address_t external_ip_address;
+  u32 vrf_id;
+};
+
+/** \brief Dump NAT66 static mappings
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define nat66_static_mapping_dump {
+  u32 client_index;
+  u32 context;
+};
+
+/** \brief NAT66 static mapping details response
+    @param context - sender context, to match reply w/ request
+    @param local_ip_address - local IPv6 address
+    @param external_ip_address - external IPv6 address
+    @param vrf_id - VRF id of tenant
+    @param total_bytes - count of bytes sent through static mapping
+    @param total_pkts - count of pakets sent through static mapping
+*/
+define nat66_static_mapping_details {
+  u32 context;
+  vl_api_ip6_address_t local_ip_address;
+  vl_api_ip6_address_t external_ip_address;
+  u32 vrf_id;
+  u64 total_bytes;
+  u64 total_pkts;
+};