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diff --git a/zerotierone/node/SelfAwareness.hpp b/zerotierone/node/SelfAwareness.hpp
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+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2016  ZeroTier, Inc.  https://www.zerotier.com/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ZT_SELFAWARENESS_HPP
+#define ZT_SELFAWARENESS_HPP
+
+#include "Constants.hpp"
+#include "InetAddress.hpp"
+#include "Hashtable.hpp"
+#include "Address.hpp"
+#include "Mutex.hpp"
+
+namespace ZeroTier {
+
+class RuntimeEnvironment;
+
+/**
+ * Tracks changes to this peer's real world addresses
+ */
+class SelfAwareness
+{
+public:
+	SelfAwareness(const RuntimeEnvironment *renv);
+	~SelfAwareness();
+
+	/**
+	 * Called when a trusted remote peer informs us of our external network address
+	 *
+	 * @param reporter ZeroTier address of reporting peer
+	 * @param receivedOnLocalAddress Local address on which report was received
+	 * @param reporterPhysicalAddress Physical address that reporting peer seems to have
+	 * @param myPhysicalAddress Physical address that peer says we have
+	 * @param trusted True if this peer is trusted as an authority to inform us of external address changes
+	 * @param now Current time
+	 */
+	void iam(const Address &reporter,const InetAddress &receivedOnLocalAddress,const InetAddress &reporterPhysicalAddress,const InetAddress &myPhysicalAddress,bool trusted,uint64_t now);
+
+	/**
+	 * Clean up database periodically
+	 *
+	 * @param now Current time
+	 */
+	void clean(uint64_t now);
+
+	/**
+	 * If we appear to be behind a symmetric NAT, get predictions for possible external endpoints
+	 *
+	 * @return Symmetric NAT predictions or empty vector if none
+	 */
+	std::vector<InetAddress> getSymmetricNatPredictions();
+
+private:
+	struct PhySurfaceKey
+	{
+		Address reporter;
+		InetAddress receivedOnLocalAddress;
+		InetAddress reporterPhysicalAddress;
+		InetAddress::IpScope scope;
+
+		PhySurfaceKey() : reporter(),scope(InetAddress::IP_SCOPE_NONE) {}
+		PhySurfaceKey(const Address &r,const InetAddress &rol,const InetAddress &ra,InetAddress::IpScope s) : reporter(r),receivedOnLocalAddress(rol),reporterPhysicalAddress(ra),scope(s) {}
+
+		inline unsigned long hashCode() const throw() { return ((unsigned long)reporter.toInt() + (unsigned long)scope); }
+		inline bool operator==(const PhySurfaceKey &k) const throw() { return ((reporter == k.reporter)&&(receivedOnLocalAddress == k.receivedOnLocalAddress)&&(reporterPhysicalAddress == k.reporterPhysicalAddress)&&(scope == k.scope)); }
+	};
+	struct PhySurfaceEntry
+	{
+		InetAddress mySurface;
+		uint64_t ts;
+
+		PhySurfaceEntry() : mySurface(),ts(0) {}
+		PhySurfaceEntry(const InetAddress &a,const uint64_t t) : mySurface(a),ts(t) {}
+	};
+
+	const RuntimeEnvironment *RR;
+
+	Hashtable< PhySurfaceKey,PhySurfaceEntry > _phy;
+	Mutex _phy_m;
+};
+
+} // namespace ZeroTier
+
+#endif