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diff --git a/linden/indra/llmessage/net.h b/linden/indra/llmessage/net.h
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+/** 
+ * @file net.h
+ * @brief Cross platform UDP network code.
+ *
+ * Copyright (c) 2000-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LL_NET_H                                        
+#define LL_NET_H
+
+class LLTimer;
+class LLHost;
+
+#define NET_BUFFER_SIZE (0x2000)
+
+// Request a free local port from the operating system
+#define NET_USE_OS_ASSIGNED_PORT 0
+
+// Returns 0 on success, non-zero on error.
+// Sets socket handler/descriptor, changes nPort if port requested is unavailable.
+S32             start_net(S32& socket_out, int& nPort);                                                         
+void    end_net();
+
+// returns size of packet or -1 in case of error
+S32             receive_packet(int hSocket, char * receiveBuffer);
+
+BOOL    send_packet(int hSocket, const char *sendBuffer, int size, U32 recipient, int nPort);   // Returns TRUE on success.
+
+//void  get_sender(char * tmp);
+LLHost  get_sender();
+U32             get_sender_port();
+U32             get_sender_ip(void);
+
+const char*     u32_to_ip_string(U32 ip);                                       // Returns pointer to internal string buffer, "(bad IP addr)" on failure, cannot nest calls 
+char*           u32_to_ip_string(U32 ip, char *ip_string);      // NULL on failure, ip_string on success, you must allocate at least MAXADDRSTR chars
+U32                     ip_string_to_u32(const char* ip_string);        // Wrapper for inet_addr()
+
+extern const char* LOOPBACK_ADDRESS_STRING;
+
+
+// useful MTU consts
+
+const S32       MTUBYTES = 1200;        // 1500 = standard Ethernet MTU
+const S32       ETHERNET_MTU_BYTES = 1500;
+const S32       MTUBITS = MTUBYTES*8;
+const S32       MTUU32S = MTUBITS/32;
+
+
+#endif