en(7)                  DEVICES AND MODULES                  en(7)



NAME
     /dev/en - 10 Mb/s Ethernet interface

DESCRIPTION
     The en interface provides access to a 10 Mb/s Ethernet  net-
     work.   The  Sony  ethernet  driver  is implmented as a DLPI
     streams provider.  Only the style 2 explicit attachment mode
     interface is supported.

     The ethernet driver supports Xerox, ISO 802.2,  and  RFC1042
     (SNAP) data formats.  The Xerox and ISO 802.2 connectionless
     formats are selected at DL_BIND time.  By binding to a DLSAP
     less than 256, ISO connectionless format is selected.

     The ethernet  driver  supports  multicasting.   A  multicast
     address  can  be  added by issueing an ioctl SEN_ADDM to the
     driver.  The only argument is a pointer to a six byte ether-
     net  address.  The multicast address can be deleted later by
     issueing a SEN_DELM ioctl request to the driver.

     The NEWS ethernet interface  supports  the  Stanford  packet
     filter.   A  user  program  called netwatch is provided that
     supports most of the functions of the Berkeley tcpdump util-
     ity.   This  program  can  be used to watch ethernet packets
     going in and out of the local machines network interfaces.

     The en interface employs  the  address  resolution  protocol
     described  in arp(7) to dynamically map between Internet and
     Ethernet addresses on the local network.  The Sony  ethernet
     interface  supports  automatic  selection  of  SNAP encoding
     using the address resolution protocol.

     The interface supports ``trailer'' encapsulation  on  input,
     but  does  not  support sending ``trailer'' packets since it
     provides no performance improvement for Sony NEWS machines.

DIAGNOSTICS
     lance%d: ethernet init failed.  Initialization failed.

     lance%d: hardware reset.  Reset to clear chip bug.

     lance%d: babble.  Packet greater than 1514 bytes long.

     lance%d: memory error.  Bus arbitration error.

     lance%d: recv framing error.  Packet not multiple of 8bits.

     lance%d: recv overflow error.  Receive ring overflowed.

     lance%d: recv crc error.  Packet received with bad checksum.





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en(7)                  DEVICES AND MODULES                  en(7)



     lance%d: xmit buffer error.  Bus arbitration error.

     lance%d: xmit underflow error.  Memory access error.

     lance%d: xmit late collision.  Ethernet arbitration failed.

     lance%d: xmit lost carrier.  Possible transceiver error.

     lance%d: xmit error: retry tdr Nus.  Cable break indication.

FILES
     /usr/include/io/sonyen.h

SEE ALSO
     intro(7), inet(7), arp(7), netwatch(1M)








































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