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ln(7)

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NAME    [Toc]    [Back]

       ln - Lance Ethernet interface

SYNOPSIS    [Toc]    [Back]

       config_driver ln

DESCRIPTION    [Toc]    [Back]

       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.

ERRORS    [Toc]    [Back]

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

EXAMPLES    [Toc]    [Back]

       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("\n");
         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); }

SEE ALSO    [Toc]    [Back]

      
      
       arp(7), inet(7), netintro(7)



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