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diff --git a/node/Network.hpp b/node/Network.hpp
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+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2012-2013  ZeroTier Networks LLC
+ *
+ * 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/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#ifndef _ZT_NETWORK_HPP
+#define _ZT_NETWORK_HPP
+
+#include <string>
+#include <set>
+#include <vector>
+#include <stdexcept>
+#include "EthernetTap.hpp"
+#include "Address.hpp"
+#include "Mutex.hpp"
+#include "InetAddress.hpp"
+#include "Constants.hpp"
+#include "SharedPtr.hpp"
+#include "AtomicCounter.hpp"
+#include "RuntimeEnvironment.hpp"
+#include "Thread.hpp"
+#include "MulticastGroup.hpp"
+
+namespace ZeroTier {
+
+class NodeConfig;
+
+/**
+ * Local network endpoint
+ */
+class Network : protected Thread
+{
+	friend class SharedPtr<Network>;
+	friend class NodeConfig;
+
+private:
+	virtual ~Network();
+
+	Network(const RuntimeEnvironment *renv,uint64_t id)
+		throw(std::runtime_error);
+
+public:
+	/**
+	 * @return Network ID
+	 */
+	inline uint64_t id() const throw() { return _id; }
+
+	/**
+	 * @return Ethernet tap
+	 */
+	inline EthernetTap &tap() throw() { return _tap; }
+
+	/**
+	 * Get this network's members
+	 * 
+	 * If this is an open network, membership isn't relevant and this doesn't
+	 * mean much. If it's a closed network, frames will only be exchanged to/from
+	 * members.
+	 * 
+	 * @return Members of this network
+	 */
+	inline std::set<Address> members() const
+	{
+		Mutex::Lock _l(_lock);
+		return _members;
+	}
+
+	/**
+	 * @param addr Address to check
+	 * @return True if address is a member
+	 */
+	inline bool isMember(const Address &addr) const
+		throw()
+	{
+		Mutex::Lock _l(_lock);
+		return (_members.count(addr) > 0);
+	}
+
+	/**
+	 * Shortcut to check open() and then isMember()
+	 * 
+	 * @param addr Address to check
+	 * @return True if network is open or if address is a member
+	 */
+	inline bool isAllowed(const Address &addr) const
+		throw()
+	{
+		Mutex::Lock _l(_lock);
+		return ((_open)||(_members.count(addr) > 0));
+	}
+
+	/**
+	 * @return True if network is open (no membership required)
+	 */
+	inline bool open() const
+		throw()
+	{
+		Mutex::Lock _l(_lock);
+		return _open;
+	}
+
+	/**
+	 * Update internal multicast group set and return true if changed
+	 *
+	 * @return True if internal multicast group set has changed
+	 */
+	inline bool updateMulticastGroups()
+	{
+		Mutex::Lock _l(_lock);
+		return _tap.updateMulticastGroups(_multicastGroups);
+	}
+
+	/**
+	 * @return Latest set of multicast groups
+	 */
+	inline std::set<MulticastGroup> multicastGroups() const
+	{
+		Mutex::Lock _l(_lock);
+		return _multicastGroups;
+	}
+
+protected:
+	virtual void main()
+		throw();
+
+private:
+	const RuntimeEnvironment *_r;
+	uint64_t _id;
+	EthernetTap _tap;
+	std::set<Address> _members;
+	std::set<MulticastGroup> _multicastGroups;
+	bool _open;
+	Mutex _lock;
+
+	AtomicCounter __refCount;
+};
+
+} // naemspace ZeroTier
+
+#endif