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diff --git a/tap-win32/constants.h b/tap-win32/constants.h
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+/*
+ *  TAP-Win32/TAP-Win64 -- A kernel driver to provide virtual tap
+ *                         device functionality on Windows.
+ *
+ *  This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
+ *
+ *  This source code is Copyright (C) 2002-2010 OpenVPN Technologies, Inc.,
+ *  and is released under the GPL version 2 (see below).
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  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 (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+//====================================================================
+//                        Product and Version public settings
+//====================================================================
+
+#define PRODUCT_STRING PRODUCT_TAP_DEVICE_DESCRIPTION
+
+#define TAP_NDIS_MAJOR_VERSION 5
+#define TAP_NDIS_MINOR_VERSION 0
+
+//===========================================================
+// Driver constants
+//===========================================================
+
+#define ETHERNET_HEADER_SIZE     (sizeof (ETH_HEADER))
+#define ETHERNET_MTU             1500
+#define ETHERNET_PACKET_SIZE     (ETHERNET_MTU + ETHERNET_HEADER_SIZE)
+#define DEFAULT_PACKET_LOOKAHEAD (ETHERNET_PACKET_SIZE)
+
+#define NIC_MAX_MCAST_LIST 32  // Max length of multicast address list
+
+#define MINIMUM_MTU 576        // USE TCP Minimum MTU
+#define MAXIMUM_MTU 65536      // IP maximum MTU
+
+#define PACKET_QUEUE_SIZE   64 // tap -> userspace queue size
+#define IRP_QUEUE_SIZE      16 // max number of simultaneous i/o operations from userspace
+#define INJECT_QUEUE_SIZE   16 // DHCP/ARP -> tap injection queue
+
+#define TAP_LITTLE_ENDIAN      // affects ntohs, htonl, etc. functions