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diff --git a/device/if_ether.h b/device/if_ether.h
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+/*
+ * Mach Operating System
+ * Copyright (c) 1991 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ * Ethernet definitions.
+ */
+/*
+ *	Author: David B. Golub, Carnegie Mellon University
+ *	Date: 	8/89
+ */
+
+#ifndef	_DEVICE_IF_ETHER_H_
+#define _DEVICE_IF_ETHER_H_
+
+#include <sys/types.h>
+
+/*
+ * Structure of a 10Mb/s Ethernet header.
+ */
+struct	ether_header {
+	u_char	ether_dhost[6];
+	u_char	ether_shost[6];
+	u_short	ether_type;
+};
+
+#define	ETHERMTU	1500
+#define	ETHERMIN	(60-14)
+
+#ifdef	KERNEL
+u_char	etherbroadcastaddr[6];
+
+extern char *	ether_sprintf();
+#endif	KERNEL
+
+#endif	/*_DEVICE_IF_ETHER_H_*/