if_ether.h

<B>Digital的Unix操作系统VAX 4.2源码</B>

/*	@(#)if_ether.h	4.1	(ULTRIX)	7/2/90	*/

/*
 * 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	ETHERPUP_PUPTYPE	0x0400		/* PUP protocol */
#define	ETHERPUP_IPTYPE		0x0800		/* IP protocol */

/*
 * The ETHERPUP_NTRAILER packet types starting at ETHERPUP_TRAIL have
 * (type-ETHERPUP_TRAIL)*512 bytes of data followed
 * by a PUP type (as given above) and then the (variable-length) header.
 */
#define	ETHERPUP_TRAIL		0x1000		/* Trailer PUP */
#define	ETHERPUP_NTRAILER	16

#define	ETHERMTU	1500
#define	ETHERMIN	(60-14)