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diff --git a/zto/node/MAC.hpp b/zto/node/MAC.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_MAC_HPP
+#define ZT_MAC_HPP
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "Constants.hpp"
+#include "Utils.hpp"
+#include "Address.hpp"
+#include "Buffer.hpp"
+
+namespace ZeroTier {
+
+/**
+ * 48-byte Ethernet MAC address
+ */
+class MAC
+{
+public:
+	MAC() throw() : _m(0ULL) {}
+	MAC(const MAC &m) throw() : _m(m._m) {}
+
+	MAC(const unsigned char a,const unsigned char b,const unsigned char c,const unsigned char d,const unsigned char e,const unsigned char f) throw() :
+		_m( ((((uint64_t)a) & 0xffULL) << 40) |
+		    ((((uint64_t)b) & 0xffULL) << 32) |
+		    ((((uint64_t)c) & 0xffULL) << 24) |
+		    ((((uint64_t)d) & 0xffULL) << 16) |
+		    ((((uint64_t)e) & 0xffULL) << 8) |
+		    (((uint64_t)f) & 0xffULL) ) {}
+
+	MAC(const char *s) throw() { fromString(s); }
+	MAC(const std::string &s) throw() { fromString(s.c_str()); }
+
+	MAC(const void *bits,unsigned int len) throw() { setTo(bits,len); }
+
+	MAC(const Address &ztaddr,uint64_t nwid) throw() { fromAddress(ztaddr,nwid); }
+
+	MAC(const uint64_t m) throw() : _m(m & 0xffffffffffffULL) {}
+
+	/**
+	 * @return MAC in 64-bit integer
+	 */
+	inline uint64_t toInt() const throw() { return _m; }
+
+	/**
+	 * Set MAC to zero
+	 */
+	inline void zero() { _m = 0ULL; }
+
+	/**
+	 * @return True if MAC is non-zero
+	 */
+	inline operator bool() const throw() { return (_m != 0ULL); }
+
+	/**
+	 * @param bits Raw MAC in big-endian byte order
+	 * @param len Length, must be >= 6 or result is zero
+	 */
+	inline void setTo(const void *bits,unsigned int len)
+		throw()
+	{
+		if (len < 6) {
+			_m = 0ULL;
+			return;
+		}
+		const unsigned char *b = (const unsigned char *)bits;
+		_m =  ((((uint64_t)*b) & 0xff) << 40); ++b;
+		_m |= ((((uint64_t)*b) & 0xff) << 32); ++b;
+		_m |= ((((uint64_t)*b) & 0xff) << 24); ++b;
+		_m |= ((((uint64_t)*b) & 0xff) << 16); ++b;
+		_m |= ((((uint64_t)*b) & 0xff) << 8); ++b;
+		_m |= (((uint64_t)*b) & 0xff);
+	}
+
+	/**
+	 * @param buf Destination buffer for MAC in big-endian byte order
+	 * @param len Length of buffer, must be >= 6 or nothing is copied
+	 */
+	inline void copyTo(void *buf,unsigned int len) const
+		throw()
+	{
+		if (len < 6)
+			return;
+		unsigned char *b = (unsigned char *)buf;
+		*(b++) = (unsigned char)((_m >> 40) & 0xff);
+		*(b++) = (unsigned char)((_m >> 32) & 0xff);
+		*(b++) = (unsigned char)((_m >> 24) & 0xff);
+		*(b++) = (unsigned char)((_m >> 16) & 0xff);
+		*(b++) = (unsigned char)((_m >> 8) & 0xff);
+		*b = (unsigned char)(_m & 0xff);
+	}
+
+	/**
+	 * Append to a buffer in big-endian byte order
+	 *
+	 * @param b Buffer to append to
+	 */
+	template<unsigned int C>
+	inline void appendTo(Buffer<C> &b) const
+		throw(std::out_of_range)
+	{
+		unsigned char *p = (unsigned char *)b.appendField(6);
+		*(p++) = (unsigned char)((_m >> 40) & 0xff);
+		*(p++) = (unsigned char)((_m >> 32) & 0xff);
+		*(p++) = (unsigned char)((_m >> 24) & 0xff);
+		*(p++) = (unsigned char)((_m >> 16) & 0xff);
+		*(p++) = (unsigned char)((_m >> 8) & 0xff);
+		*p = (unsigned char)(_m & 0xff);
+	}
+
+	/**
+	 * @return True if this is broadcast (all 0xff)
+	 */
+	inline bool isBroadcast() const throw() { return (_m == 0xffffffffffffULL); }
+
+	/**
+	 * @return True if this is a multicast MAC
+	 */
+	inline bool isMulticast() const throw() { return ((_m & 0x010000000000ULL) != 0ULL); }
+
+	/**
+	 * @param True if this is a locally-administered MAC
+	 */
+	inline bool isLocallyAdministered() const throw() { return ((_m & 0x020000000000ULL) != 0ULL); }
+
+	/**
+	 * @param s Hex MAC, with or without : delimiters
+	 */
+	inline void fromString(const char *s)
+	{
+		char tmp[8];
+		for(int i=0;i<6;++i)
+			tmp[i] = (char)0;
+		Utils::unhex(s,tmp,6);
+		setTo(tmp,6);
+	}
+
+	/**
+	 * @return MAC address in standard :-delimited hex format
+	 */
+	inline std::string toString() const
+	{
+		char tmp[24];
+		toString(tmp,sizeof(tmp));
+		return std::string(tmp);
+	}
+
+	/**
+	 * @param buf Buffer to contain human-readable MAC
+	 * @param len Length of buffer
+	 */
+	inline void toString(char *buf,unsigned int len) const
+	{
+		Utils::snprintf(buf,len,"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",(int)(*this)[0],(int)(*this)[1],(int)(*this)[2],(int)(*this)[3],(int)(*this)[4],(int)(*this)[5]);
+	}
+
+	/**
+	 * Set this MAC to a MAC derived from an address and a network ID
+	 *
+	 * @param ztaddr ZeroTier address
+	 * @param nwid 64-bit network ID
+	 */
+	inline void fromAddress(const Address &ztaddr,uint64_t nwid)
+		throw()
+	{
+		uint64_t m = ((uint64_t)firstOctetForNetwork(nwid)) << 40;
+		m |= ztaddr.toInt(); // a is 40 bits
+		m ^= ((nwid >> 8) & 0xff) << 32;
+		m ^= ((nwid >> 16) & 0xff) << 24;
+		m ^= ((nwid >> 24) & 0xff) << 16;
+		m ^= ((nwid >> 32) & 0xff) << 8;
+		m ^= (nwid >> 40) & 0xff;
+		_m = m;
+	}
+
+	/**
+	 * Get the ZeroTier address for this MAC on this network (assuming no bridging of course, basic unicast)
+	 *
+	 * This just XORs the next-lest-significant 5 bytes of the network ID again to unmask.
+	 *
+	 * @param nwid Network ID
+	 */
+	inline Address toAddress(uint64_t nwid) const
+		throw()
+	{
+		uint64_t a = _m & 0xffffffffffULL; // least significant 40 bits of MAC are formed from address
+		a ^= ((nwid >> 8) & 0xff) << 32; // ... XORed with bits 8-48 of the nwid in little-endian byte order, so unmask it
+		a ^= ((nwid >> 16) & 0xff) << 24;
+		a ^= ((nwid >> 24) & 0xff) << 16;
+		a ^= ((nwid >> 32) & 0xff) << 8;
+		a ^= (nwid >> 40) & 0xff;
+		return Address(a);
+	}
+
+	/**
+	 * @param nwid Network ID
+	 * @return First octet of MAC for this network
+	 */
+	static inline unsigned char firstOctetForNetwork(uint64_t nwid)
+		throw()
+	{
+		unsigned char a = ((unsigned char)(nwid & 0xfe) | 0x02); // locally administered, not multicast, from LSB of network ID
+		return ((a == 0x52) ? 0x32 : a); // blacklist 0x52 since it's used by KVM, libvirt, and other popular virtualization engines... seems de-facto standard on Linux
+	}
+
+	/**
+	 * @param i Value from 0 to 5 (inclusive)
+	 * @return Byte at said position (address interpreted in big-endian order)
+	 */
+	inline unsigned char operator[](unsigned int i) const throw() { return (unsigned char)((_m >> (40 - (i * 8))) & 0xff); }
+
+	/**
+	 * @return 6, which is the number of bytes in a MAC, for container compliance
+	 */
+	inline unsigned int size() const throw() { return 6; }
+
+	inline unsigned long hashCode() const throw() { return (unsigned long)_m; }
+
+	inline MAC &operator=(const MAC &m)
+		throw()
+	{
+		_m = m._m;
+		return *this;
+	}
+	inline MAC &operator=(const uint64_t m)
+		throw()
+	{
+		_m = m;
+		return *this;
+	}
+
+	inline bool operator==(const MAC &m) const throw() { return (_m == m._m); }
+	inline bool operator!=(const MAC &m) const throw() { return (_m != m._m); }
+	inline bool operator<(const MAC &m) const throw() { return (_m < m._m); }
+	inline bool operator<=(const MAC &m) const throw() { return (_m <= m._m); }
+	inline bool operator>(const MAC &m) const throw() { return (_m > m._m); }
+	inline bool operator>=(const MAC &m) const throw() { return (_m >= m._m); }
+
+private:
+	uint64_t _m;
+};
+
+} // namespace ZeroTier
+
+#endif