la(7)                            (TCP/IP)                             la(7)


   NAME
         la - ethernet device driver

   SYNOPSIS
         fd = open("/dev/en0", ORDWR);

   DESCRIPTION
         The la is a STREAMS-based cloned software driver used with the Riebl
         Lance VME bus Ethernet board/driver. The la interface conforms to the
         Data Link Provider Interface (DLPI).

         During the TCP/IP startup, the la device is opened and linked to the
         IP and ARP STREAMS modules via the slink command.  From then on, la
         converts all the outgoing packets, received from IP/ARP, to the
         format defined by Common Environment/BPP interface and passes these
         packets to the Riebl Board.

         Upon receiving incoming packets from the Riebl board, la converts
         these packets to the STREAMS-based DLPI format messages and passes
         these packets to IP/ARP.

         The name of the device node is``/dev/en0''. This device name is used
         as the Ethernet network interface name in two places:  by
         ifconfig(1M) in the script /etc/inet/rc.inet; by cenet in the
         database file /etc/inet/strcf.

         The device supports two ioctls.

         LA_GETADDR
               returns the ethernet address stored in battery backed up ram on
               the board.

         LA_SETADDR
               sets the ethernet address, and stores it in the battery backed
               up ram.

   SEE ALSO
         enaddr(1M), slink(1M), strcf(4N), arp(7), ip(7).

         McGrath, G, A STREAMS-based Data Link Provider Interface (DLPI) Issue
         2, Version 1.2, AT&T Bell Laboratories, Summit, N.J., February 1989.












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