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diff --git a/extras/vom/vom/nat_binding.hpp b/extras/vom/vom/nat_binding.hpp
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+++ b/extras/vom/vom/nat_binding.hpp
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+/*
+ * Copyright (c) 2017 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.
+ */
+
+#ifndef __VOM_NAT_BINDING_H__
+#define __VOM_NAT_BINDING_H__
+
+#include "vom/hw.hpp"
+#include "vom/interface.hpp"
+#include "vom/object_base.hpp"
+#include "vom/om.hpp"
+#include "vom/singular_db.hpp"
+
+namespace VOM {
+/**
+ * A Class representing the binding of an L2 interface to a bridge-domain
+ * and the properties of that binding.
+ */
+class nat_binding : public object_base
+{
+public:
+  /**
+   * NAT Zoness
+   */
+  struct zone_t : public enum_base<zone_t>
+  {
+    /**
+     * Constructor
+     */
+    zone_t(int v, const std::string s);
+
+    /**
+     * Destructor
+     */
+    ~zone_t() = default;
+
+    /**
+     * Permit Zone
+     */
+    const static zone_t INSIDE;
+
+    /**
+     * Deny Zone
+     */
+    const static zone_t OUTSIDE;
+
+    const static zone_t& from_vpp(u8 is_inside);
+  };
+
+  /**
+   * The key for a NAT Binding.
+   *  The zoe is not included, since the same interface is never inside
+   * and outside.
+   */
+  typedef std::tuple<interface::key_t, direction_t, l3_proto_t> key_t;
+
+  /**
+   * Construct a new object matching the desried state
+   *  @param itf The interface onto which we bind/apply the feature
+   *  @param dir The direction (input/output)
+   *  @param proto The L3 proto used inside.
+   *  @param zone The NAT zone for the link
+   */
+  nat_binding(const interface& itf,
+              const direction_t& dir,
+              const l3_proto_t& proto,
+              const zone_t& zone);
+
+  /**
+   * Copy Constructor
+   */
+  nat_binding(const nat_binding& o);
+
+  /**
+   * Destructor
+   */
+  ~nat_binding();
+
+  /**
+   * Comparison operator - for UT
+   */
+  bool operator==(const nat_binding& n) const;
+
+  /**
+   * Return the binding's key
+   */
+  const key_t key() const;
+
+  /**
+   * Return the 'singular instance' of the L2 config that matches this
+   * object
+   */
+  std::shared_ptr<nat_binding> singular() const;
+
+  /**
+   * convert to string format for debug purposes
+   */
+  std::string to_string() const;
+
+  /**
+   * Static function to find the bridge_domain in the model
+   */
+  static std::shared_ptr<nat_binding> find(const key_t& key);
+
+  /**
+   * Dump all nat_bindings into the stream provided
+   */
+  static void dump(std::ostream& os);
+
+private:
+  /**
+   * Class definition for listeners to OM events
+   */
+  class event_handler : public OM::listener, public inspect::command_handler
+  {
+  public:
+    event_handler();
+    virtual ~event_handler() = default;
+
+    /**
+     * Handle a populate event
+     */
+    void handle_populate(const client_db::key_t& key);
+
+    /**
+     * Handle a replay event
+     */
+    void handle_replay();
+
+    /**
+     * Show the object in the Singular DB
+     */
+    void show(std::ostream& os);
+
+    /**
+     * Get the sortable Id of the listener
+     */
+    dependency_t order() const;
+  };
+
+  /**
+   * event_handler to register with OM
+   */
+  static event_handler m_evh;
+
+  /**
+   * Enquue commonds to the VPP command Q for the update
+   */
+  void update(const nat_binding& obj);
+
+  /**
+   * Find or Add the singular instance in the DB
+   */
+  static std::shared_ptr<nat_binding> find_or_add(const nat_binding& temp);
+
+  /*
+   * It's the OM class that calls singular()
+   */
+  friend class OM;
+
+  /**
+   * It's the singular_db class that calls replay()
+   */
+  friend class singular_db<const key_t, nat_binding>;
+
+  /**
+   * Sweep/reap the object if still stale
+   */
+  void sweep(void);
+
+  /**
+   * replay the object to create it in hardware
+   */
+  void replay(void);
+
+  /**
+   * HW configuration for the binding. The bool representing the
+   * do/don't bind.
+   */
+  HW::item<bool> m_binding;
+
+  /**
+   * A reference counting pointer the interface that this NAT binding
+   * represents. By holding the reference here, we can guarantee that
+   * this object will outlive the interface
+   */
+  const std::shared_ptr<interface> m_itf;
+
+  /**
+   * The direction in which the feature applies
+   */
+  direction_t m_dir;
+
+  /**
+   * The L3 protocol used on the inside
+   */
+  l3_proto_t m_proto;
+
+  /**
+   * The NAT zone the interface is in
+   */
+  zone_t m_zone;
+
+  /**
+   * A map of all L2 interfaces key against the interface's handle_t
+   */
+  static singular_db<const key_t, nat_binding> m_db;
+};
+
+std::ostream& operator<<(std::ostream& os, const nat_binding::key_t& key);
+};
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */
+
+#endif