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diff --git a/private/inc/nettypes.h b/private/inc/nettypes.h
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+++ b/private/inc/nettypes.h
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+/*++
+
+Copyright (c) 1989  Microsoft Corporation
+
+Module Name:
+
+    nettypes.h
+
+Abstract:
+
+    This header file contains type definitions for the NT TDI, NDI,
+    DDI, and PDI interfaces which are not specific to a single interface.
+
+Author:
+
+    Steve Jones (stevej) 26-Oct-1989
+
+Revision History:
+
+--*/
+
+#ifndef _NETTYPES_
+#define _NETTYPES_
+
+//
+// The following basic type is used to provide extensibility in request
+// and response packets.  The OFFSET type is used to contain a value which
+// is interpreted as a relative address consisting of a number of bytes
+// from the beginning of the immediate parent structure.
+//
+
+typedef ULONG OFFSET;
+
+//
+// The following basic type is used throughout all the layers to pass a
+// string through an I/O interface which does not allow embedded pointers.
+// To allocate a FLAT_STRING, one must make room for the correct number of
+// buffer bytes in the allocation.
+//
+
+typedef struct _FLAT_STRING {
+    SHORT MaximumLength;            // total size of string buffer.
+    SHORT Length;                   // number of bytes represented in string.
+    char Buffer [1];                // the buffer itself follows this struct.
+} FLAT_STRING, *PFLAT_STRING;
+
+//
+// Basic type used to represent a network name, typically as a component of
+// a transport address structure through the TDI.  This type is also passed
+// through the NDI interface.  This type is declared as a structure so that
+// it can be extended easily without modifying applications, even though it
+// currently only has one element.
+//
+//
+
+typedef struct _NETWORK_NAME {
+    FLAT_STRING Name;                   // network name in FLAT_STRING format.
+} NETWORK_NAME, *PNETWORK_NAME;
+
+//
+// Basic type used to represent an address at the hardware level of the
+// network.  Hardware addresses are abstract types which are mapped to
+// adapter addresses by the physical provider.  See the Physical Driver
+// Interface specification for details on how this is accomplished.
+//
+
+#define HARDWARE_ADDRESS_LENGTH     6   // number of octets in a hardware address.
+
+typedef struct _HARDWARE_ADDRESS {
+    UCHAR Address [HARDWARE_ADDRESS_LENGTH];
+} HARDWARE_ADDRESS, *PHARDWARE_ADDRESS;
+
+//
+// Network management variable types used by all interface levels.
+//
+
+#define NETMAN_VARTYPE_ULONG            0       // type is a ULONG.
+#define NETMAN_VARTYPE_HARDWARE_ADDRESS 1       // type is a HARDWARE_ADDRESS.
+#define NETMAN_VARTYPE_STRING           2       // type is a FLAT_STRING.
+
+#endif // _NETTYPES_