EX(4)                                                                    EX(4)



NAME
       ex - Excelan 10 Mb/s Ethernet interface

SYNOPSIS
       device ex0 at uba0 csr 164000 vector excdint

DESCRIPTION
       The  _e_x interface provides access to a 10 Mb/s Ethernet network through
       an Excelan controller used as a link-layer interface.

       Each of the host’s network addresses is specified at boot time with  an
       SIOCSIFADDR  ioctl.   The  _e_x  interface employs the address resolution
       protocol described in _a_r_p(4P) to dynamically map between  Internet  and
       Ethernet addresses on the local network.

       The interface normally tries to use a ‘‘trailer’’ encapsulation to min‐
       imize copying data on input and output.  The use of trailers is negoti‐
       ated  with  ARP.   This negotiation may be disabled, on a per-interface
       basis, by setting the IFF_NOTRAILERS flag with an SIOCSIFFLAGS ioctl.

DIAGNOSTICS
       ex%d: HW %c.%c, NX %c.%c, hardware address %s.  This provides  firmware
       revisions levels, and is expected during autoconfiguration.

       ex%d:  can’’t  initialize.   There  was  a  failure in allocating unibus
       resources for the device.

       ex%d: configuration failed; cc = %x.  The hardware indicated  an  error
       when  trying to initalize itself.  The error code returned is described
       at length in the device Reference Manual.

       ex%d: receive error %b.  The hardware indicated an error in  reading  a
       packet from the cable.  Specific Error bits are provided

       ex%d:  transmit error %b.  The hardware indicated an error in transmit‐
       ting a packet to the cable or  an  illegally  sized  packet.   Specific
       Error bits are provided

       ex%d:  can’’t  handle  af%d.   The  interface  was handed a message with
       addresses formatted in an unsuitable address  family;  the  packet  was
       dropped.

SEE ALSO
       intro(4N), inet(4F), arp(4P)



4.2 Berkeley Distribution        May 16, 1986                            EX(4)