le(7)							 Miscellaneous Information Manual						     le(7)

NAME

       le - LeMAC Ethernet interface

SYNOPSIS

       config_driver le

DESCRIPTION

       The le interface provides access to a 10 Mb/s Ethernet network through the LeMAC controller.

       The  host's Internet address is specified at boot time with an SIOCSIFADDR ioctl.  The le interface employs the address resolution protocol
       described in arp(7) to map dynamically between Internet and Ethernet addresses on the local network.

       The SIOCSPHYSADDR ioctl can be used to change the physical address of the LeMAC.  The SIOCRPHYSADDR ioctl can be used to read the  physical
       address of the LeMAC.

       The  SIOCADDMULTI and SIOCDELMULTI ioctls can be used to add or delete multicast addresses.  The LeMAC recognizes a maximum of 12 multicast
       addresses.

       The SIOCRDCTRS and SIOCRDZCTRS ioctls can be used to read or ``read and clear'' the Ethernet driver counters.  The argument  to	these  two
       ioctls is a pointer to a counter structure, ctrreq, found in <net/if.h>.

       The SIOCENABLBACK and SIOCDISABLBACK ioctls can be used to enable and disable the interface loopback mode respectively.

EXAMPLES

       To  obtain  the	physical  address  of  the  adapter,  use  the SIOCRPHYSADDR ioctl as in the following program example: #include <stdio.h>
       /* standard I/O */ #include <errno.h>		  /* error numbers */ #include <sys/socket.h>	      /* socket  definitions  */  #include
       <sys/ioctl.h>	      /* ioctls */ #include <net/if.h>		   /* generic interface structures */

       main() {
	 int s,i;
	 struct  ifdevea  devea;
	 /* Get a socket */
	 s = socket(AF_INET,SOCK_DGRAM,0);
	 if (s < 0) {
	    perror("socket");
	    exit(1);
	 }
	 strcpy(devea.ifr_name,"le0");
	 if (ioctl(s,SIOCRPHYSADDR,&devea) < 0) {
	    perror(&devea.ifr_name[0]);
	    exit(1);
	 }
	 printf("Address is ");
	 for (i = 0; i < 6; i++)
	    printf("%X ", devea.default_pa[i] & 0xff);
	 printf("
");
	 close(s); }

       To  enable external loopback, use the SIOCENABLEBACK ioctl as in the following program example: #include <stdio.h>	       /* standard
       I/O */ #include <errno.h>	      /* error numbers */ #include <sys/socket.h>	  /* socket definitions */ #include  <sys/ioctl.h>
       /* ioctls */ #include <net/if.h> 	    /* generic interface structures */

       main() {
	 int s;
	 struct  ifreq	data;
	 /* Get a socket */
	 s = socket(AF_INET,SOCK_DGRAM,0);
	 if (s < 0) {
	    perror("socket");
	    exit(1);
	 }
	 strcpy(data.ifr,"le0");
	 if (ioctl(s,SIOCENABLEBACK,&data) < 0) {
	    perror("SIOCENABLEBACK:");
	    exit(1);
	 }
	 close(s); }

ERRORS

       The  diagnostic	error messages contain relevant information provided by the LeMAC.  The interface was handed a message with addresses for-
       matted in an unsuitable address family, and the packet was dropped.  The le driver was unable to allocate memory for internal  data  struc-
       tures.	The IRQ for the LeMAC is missing from the CMOS configuration data or is incorrect.  The IRQ for the LeMAC is missing from the CMOS
       configuration data or is incorrect.  Too many multicast requests have been made.  The shared memory block for the LeMAC's local RAM  buffer
       is  missing  from  the  CMOS  configuration data.  The station address PROM on the LeMAC is corrupt or inaccessible.  The hardware transmit
       queue has been overflowed.

	      An attempt was made to delete the Ethernet broadcast address of ff-ff-ff-ff-ff.

RELATED INFORMATION

       arp(7), inet(7), netintro(7) delim off

																	     le(7)