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diff --git a/node/RoutingTable.hpp b/node/RoutingTable.hpp
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+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2011-2014  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_SYSTEMNETWORKSTACK_HPP
+#define ZT_SYSTEMNETWORKSTACK_HPP
+
+#include <stdint.h>
+
+#include <vector>
+#include <string>
+#include <set>
+
+#include "InetAddress.hpp"
+#include "NonCopyable.hpp"
+
+namespace ZeroTier {
+
+/**
+ * Base class for OS-dependent interfaces to the system network configuration
+ */
+class SystemNetworkStack : NonCopyable
+{
+public:
+  struct RoutingTableEntry
+  {
+    char device[128];
+    InetAddress destination;
+    InetAddress gateway;
+    unsigned int deviceMetric;
+  };
+
+  SystemNetworkStack() {}
+  virtual ~SystemNetworkStack() {}
+
+  /**
+   * @return All routing table entries sorted in order of destination
+   */
+  virtual std::vector<RoutingTableEntry> routingTable() const = 0;
+
+  /**
+   * Add or update a routing table entry
+   *
+   * Note that metrics may only be changed at the device level,
+   * so changes to deviceMetric are ignored.
+   *
+   * @param re Entry to add/update
+   * @return True if successful
+   */
+  virtual bool addUpdateRoute(const RoutingTableEntry &re) = 0;
+
+  /**
+   * @param ifname Name of interface (Unix-style device or Windows device name)
+   * @return Interface metric (higher = lower priority)
+   */
+  virtual unsigned int interfaceMetric(const char *ifname) const = 0;
+
+  /**
+   * @param ifname Name of interface (Unix-style device or Windows device name)
+   * @param metric New metric (higher = lower priority)
+   * @return True if successful
+   */
+  virtual bool setInterfaceMetric(const char *ifname,unsigned int metric) = 0;
+
+  /**
+   * @return Interface names sorted in ascending order
+   */
+  virtual std::vector<std::string> interfaces() const = 0;
+
+  /**
+   * @param ignoreInterfaces List of interfaces to exclude from fingerprint
+   * @return Integer CRC-type fingerprint of current network environment
+   */
+  inline uint64_t networkEnvironmentFingerprint(const std::set<std::string> &ignoreInterfaces) const
+  {
+    std::vector<RoutingTableEntry> rtab(routingTable());
+  };
+};
+
+} // namespace ZeroTier
+
+#endif