ln(7)							 Miscellaneous Information Manual						     ln(7)

NAME

       ln - Lance Ethernet interface

SYNOPSIS

       config_driver ln

DESCRIPTION

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

       The  host's Internet address is specified at boot time with an SIOCSIFADDR ioctl.  The ln 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 Lance.  The SIOCRPHYSADDR ioctl can be used to read the  physical
       address of the Lance.

       The  SIOCADDMULTI and SIOCDELMULTI ioctls can be used to add or delete multicast addresses.  The Lance 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;
	 static   struct  ifdevea  devea;
	 /* Get a socket */
	 s = socket(AF_INET,SOCK_DGRAM,0);
	 if (s < 0) {
	    perror("socket");
	    exit(1);
	 }
	 strcpy(devea.ifr_name,"ln0");
	 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,"ln0");
	 if (ioctl(s,SIOCENABLEBACK,&data) < 0) {
	    perror("SIOCENABLEBACK:");
	    exit(1);
	 }
	 close(s); }

ERRORS

       The  diagnostic	error messages contain relevant information provided by the Lance.  The interface was handed a message with addresses for-
       matted in an unsuitable address family, and the packet was dropped.  A memory parity error has occurred.  The ln driver was unable to allo-
       cate  memory for internal data structures.  The ln driver was unable to initialize the network interface.  Too many multicast requests have
       been made.

RELATED INFORMATION

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

																	     ln(7)