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diff --git a/tap-win32/proto.h b/tap-win32/proto.h
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+/*
+ * TAP-Win32 -- A kernel driver to provide virtual tap device functionality
+ * on Windows. Originally derived from the CIPE-Win32
+ * project by Damion K. Wilson, with extensive modifications by
+ * James Yonan.
+ *
+ * All source code which derives from the CIPE-Win32 project is
+ * Copyright (C) Damion K. Wilson, 2003, and is released under the
+ * GPL version 2 (see below).
+ *
+ * All other source code is Copyright (C) 2002-2005 OpenVPN Solutions LLC,
+ * 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
+ */
+
+//============================================================
+// MAC address, Ethernet header, and ARP
+//============================================================
+
+#pragma pack(1)
+
+#define IP_HEADER_SIZE 20
+
+typedef unsigned char MACADDR [6];
+typedef unsigned long IPADDR;
+
+//-----------------
+// Ethernet address
+//-----------------
+
+typedef struct {
+ MACADDR addr;
+} ETH_ADDR;
+
+typedef struct {
+ ETH_ADDR list[NIC_MAX_MCAST_LIST];
+} MC_LIST;
+
+//----------------
+// Ethernet header
+//----------------
+
+typedef struct
+{
+ MACADDR dest; /* destination eth addr */
+ MACADDR src; /* source ether addr */
+
+# define ETH_P_IP 0x0800 /* IPv4 protocol */
+# define ETH_P_ARP 0x0806 /* ARP protocol */
+ USHORT proto; /* packet type ID field */
+} ETH_HEADER, *PETH_HEADER;
+
+//----------------
+// ARP packet
+//----------------
+
+typedef struct
+ {
+ MACADDR m_MAC_Destination; // Reverse these two
+ MACADDR m_MAC_Source; // to answer ARP requests
+ USHORT m_Proto; // 0x0806
+
+# define MAC_ADDR_TYPE 0x0001
+ USHORT m_MAC_AddressType; // 0x0001
+
+ USHORT m_PROTO_AddressType; // 0x0800
+ UCHAR m_MAC_AddressSize; // 0x06
+ UCHAR m_PROTO_AddressSize; // 0x04
+
+# define ARP_REQUEST 0x0001
+# define ARP_REPLY 0x0002
+ USHORT m_ARP_Operation; // 0x0001 for ARP request, 0x0002 for ARP reply
+
+ MACADDR m_ARP_MAC_Source;
+ IPADDR m_ARP_IP_Source;
+ MACADDR m_ARP_MAC_Destination;
+ IPADDR m_ARP_IP_Destination;
+ }
+ARP_PACKET, *PARP_PACKET;
+
+//----------
+// IP Header
+//----------
+
+typedef struct {
+# define IPH_GET_VER(v) (((v) >> 4) & 0x0F)
+# define IPH_GET_LEN(v) (((v) & 0x0F) << 2)
+ UCHAR version_len;
+
+ UCHAR tos;
+ USHORT tot_len;
+ USHORT id;
+
+# define IP_OFFMASK 0x1fff
+ USHORT frag_off;
+
+ UCHAR ttl;
+
+# define IPPROTO_UDP 17 /* UDP protocol */
+# define IPPROTO_TCP 6 /* TCP protocol */
+# define IPPROTO_ICMP 1 /* ICMP protocol */
+# define IPPROTO_IGMP 2 /* IGMP protocol */
+ UCHAR protocol;
+
+ USHORT check;
+ ULONG saddr;
+ ULONG daddr;
+ /* The options start here. */
+} IPHDR;
+
+//-----------
+// UDP header
+//-----------
+
+typedef struct {
+ USHORT source;
+ USHORT dest;
+ USHORT len;
+ USHORT check;
+} UDPHDR;
+
+//--------------------------
+// TCP header, per RFC 793.
+//--------------------------
+
+typedef struct {
+ USHORT source; /* source port */
+ USHORT dest; /* destination port */
+ ULONG seq; /* sequence number */
+ ULONG ack_seq; /* acknowledgement number */
+
+# define TCPH_GET_DOFF(d) (((d) & 0xF0) >> 2)
+ UCHAR doff_res;
+
+# define TCPH_FIN_MASK (1<<0)
+# define TCPH_SYN_MASK (1<<1)
+# define TCPH_RST_MASK (1<<2)
+# define TCPH_PSH_MASK (1<<3)
+# define TCPH_ACK_MASK (1<<4)
+# define TCPH_URG_MASK (1<<5)
+# define TCPH_ECE_MASK (1<<6)
+# define TCPH_CWR_MASK (1<<7)
+ UCHAR flags;
+
+ USHORT window;
+ USHORT check;
+ USHORT urg_ptr;
+} TCPHDR;
+
+#define TCPOPT_EOL 0
+#define TCPOPT_NOP 1
+#define TCPOPT_MAXSEG 2
+#define TCPOLEN_MAXSEG 4
+
+#pragma pack()